This is libgomp.info, produced by makeinfo version 4.12 from /space/rguenther/gcc-5.2.0/gcc-5.2.0/libgomp/libgomp.texi. Copyright (C) 2006-2015 Free Software Foundation, Inc. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with the Invariant Sections being "Funding Free Software", the Front-Cover texts being (a) (see below), and with the Back-Cover Texts being (b) (see below). A copy of the license is included in the section entitled "GNU Free Documentation License". (a) The FSF's Front-Cover Text is: A GNU Manual (b) The FSF's Back-Cover Text is: You have freedom to copy and modify this GNU Manual, like GNU software. Copies published by the Free Software Foundation raise funds for GNU development. INFO-DIR-SECTION GNU Libraries START-INFO-DIR-ENTRY * libgomp: (libgomp). GNU Offloading and Multi Processing Runtime Library. END-INFO-DIR-ENTRY This manual documents libgomp, the GNU Offloading and Multi Processing Runtime library. This is the GNU implementation of the OpenMP and OpenACC APIs for parallel and accelerator programming in C/C++ and Fortran. Published by the Free Software Foundation 51 Franklin Street, Fifth Floor Boston, MA 02110-1301 USA Copyright (C) 2006-2015 Free Software Foundation, Inc. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with the Invariant Sections being "Funding Free Software", the Front-Cover texts being (a) (see below), and with the Back-Cover Texts being (b) (see below). A copy of the license is included in the section entitled "GNU Free Documentation License". (a) The FSF's Front-Cover Text is: A GNU Manual (b) The FSF's Back-Cover Text is: You have freedom to copy and modify this GNU Manual, like GNU software. Copies published by the Free Software Foundation raise funds for GNU development.  File: libgomp.info, Node: Top, Next: Enabling OpenMP, Up: (dir) Introduction ************ This manual documents the usage of libgomp, the GNU Offloading and Multi Processing Runtime Library. This includes the GNU implementation of the OpenMP (http://www.openmp.org) Application Programming Interface (API) for multi-platform shared-memory parallel programming in C/C++ and Fortran, and the GNU implementation of the OpenACC (http://www.openacc.org/) Application Programming Interface (API) for offloading of code to accelerator devices in C/C++ and Fortran. Originally, libgomp implemented the GNU OpenMP Runtime Library. Based on this, support for OpenACC and offloading (both OpenACC and OpenMP 4's target construct) has been added later on, and the library's name changed to GNU Offloading and Multi Processing Runtime Library. * Menu: * Enabling OpenMP:: How to enable OpenMP for your applications. * Runtime Library Routines:: The OpenMP runtime application programming interface. * Environment Variables:: Influencing runtime behavior with environment variables. * The libgomp ABI:: Notes on the external ABI presented by libgomp. * Reporting Bugs:: How to report bugs in the GNU Offloading and Multi Processing Runtime Library. * Copying:: GNU general public license says how you can copy and share libgomp. * GNU Free Documentation License:: How you can copy and share this manual. * Funding:: How to help assure continued work for free software. * Library Index:: Index of this documentation.  File: libgomp.info, Node: Enabling OpenMP, Next: Runtime Library Routines, Prev: Top, Up: Top 1 Enabling OpenMP ***************** To activate the OpenMP extensions for C/C++ and Fortran, the compile-time flag `-fopenmp' must be specified. This enables the OpenMP directive `#pragma omp' in C/C++ and `!$omp' directives in free form, `c$omp', `*$omp' and `!$omp' directives in fixed form, `!$' conditional compilation sentinels in free form and `c$', `*$' and `!$' sentinels in fixed form, for Fortran. The flag also arranges for automatic linking of the OpenMP runtime library (*note Runtime Library Routines::). A complete description of all OpenMP directives accepted may be found in the OpenMP Application Program Interface (http://www.openmp.org) manual, version 4.0.  File: libgomp.info, Node: Runtime Library Routines, Next: Environment Variables, Prev: Enabling OpenMP, Up: Top 2 Runtime Library Routines ************************** The runtime routines described here are defined by Section 3 of the OpenMP specification in version 4.0. The routines are structured in following three parts: * Menu: Control threads, processors and the parallel environment. They have C linkage, and do not throw exceptions. * omp_get_active_level:: Number of active parallel regions * omp_get_ancestor_thread_num:: Ancestor thread ID * omp_get_cancellation:: Whether cancellation support is enabled * omp_get_default_device:: Get the default device for target regions * omp_get_dynamic:: Dynamic teams setting * omp_get_level:: Number of parallel regions * omp_get_max_active_levels:: Maximum number of active regions * omp_get_max_threads:: Maximum number of threads of parallel region * omp_get_nested:: Nested parallel regions * omp_get_num_devices:: Number of target devices * omp_get_num_procs:: Number of processors online * omp_get_num_teams:: Number of teams * omp_get_num_threads:: Size of the active team * omp_get_proc_bind:: Whether theads may be moved between CPUs * omp_get_schedule:: Obtain the runtime scheduling method * omp_get_team_num:: Get team number * omp_get_team_size:: Number of threads in a team * omp_get_thread_limit:: Maximum number of threads * omp_get_thread_num:: Current thread ID * omp_in_parallel:: Whether a parallel region is active * omp_in_final:: Whether in final or included task region * omp_is_initial_device:: Whether executing on the host device * omp_set_default_device:: Set the default device for target regions * omp_set_dynamic:: Enable/disable dynamic teams * omp_set_max_active_levels:: Limits the number of active parallel regions * omp_set_nested:: Enable/disable nested parallel regions * omp_set_num_threads:: Set upper team size limit * omp_set_schedule:: Set the runtime scheduling method Initialize, set, test, unset and destroy simple and nested locks. * omp_init_lock:: Initialize simple lock * omp_set_lock:: Wait for and set simple lock * omp_test_lock:: Test and set simple lock if available * omp_unset_lock:: Unset simple lock * omp_destroy_lock:: Destroy simple lock * omp_init_nest_lock:: Initialize nested lock * omp_set_nest_lock:: Wait for and set simple lock * omp_test_nest_lock:: Test and set nested lock if available * omp_unset_nest_lock:: Unset nested lock * omp_destroy_nest_lock:: Destroy nested lock Portable, thread-based, wall clock timer. * omp_get_wtick:: Get timer precision. * omp_get_wtime:: Elapsed wall clock time.  File: libgomp.info, Node: omp_get_active_level, Next: omp_get_ancestor_thread_num, Up: Runtime Library Routines 2.1 `omp_get_active_level' - Number of parallel regions ======================================================= _Description_: This function returns the nesting level for the active parallel blocks, which enclose the calling call. _C/C++_ _Prototype_: `int omp_get_active_level(void);' _Fortran_: _Interface_: `integer function omp_get_active_level()' _See also_: *note omp_get_level::, *note omp_get_max_active_levels::, *note omp_set_max_active_levels:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.2.20.  File: libgomp.info, Node: omp_get_ancestor_thread_num, Next: omp_get_cancellation, Prev: omp_get_active_level, Up: Runtime Library Routines 2.2 `omp_get_ancestor_thread_num' - Ancestor thread ID ====================================================== _Description_: This function returns the thread identification number for the given nesting level of the current thread. For values of LEVEL outside zero to `omp_get_level' -1 is returned; if LEVEL is `omp_get_level' the result is identical to `omp_get_thread_num'. _C/C++_ _Prototype_: `int omp_get_ancestor_thread_num(int level);' _Fortran_: _Interface_: `integer function omp_get_ancestor_thread_num(level)' `integer level' _See also_: *note omp_get_level::, *note omp_get_thread_num::, *note omp_get_team_size:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.2.18.  File: libgomp.info, Node: omp_get_cancellation, Next: omp_get_default_device, Prev: omp_get_ancestor_thread_num, Up: Runtime Library Routines 2.3 `omp_get_cancellation' - Whether cancellation support is enabled ==================================================================== _Description_: This function returns `true' if cancellation is activated, `false' otherwise. Here, `true' and `false' represent their language-specific counterparts. Unless `OMP_CANCELLATION' is set true, cancellations are deactivated. _C/C++_: _Prototype_: `int omp_get_cancellation(void);' _Fortran_: _Interface_: `logical function omp_get_cancellation()' _See also_: *note OMP_CANCELLATION:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.2.9.  File: libgomp.info, Node: omp_get_default_device, Next: omp_get_dynamic, Prev: omp_get_cancellation, Up: Runtime Library Routines 2.4 `omp_get_default_device' - Get the default device for target regions ======================================================================== _Description_: Get the default device for target regions without device clause. _C/C++_: _Prototype_: `int omp_get_default_device(void);' _Fortran_: _Interface_: `integer function omp_get_default_device()' _See also_: *note OMP_DEFAULT_DEVICE::, *note omp_set_default_device:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.2.24.  File: libgomp.info, Node: omp_get_dynamic, Next: omp_get_level, Prev: omp_get_default_device, Up: Runtime Library Routines 2.5 `omp_get_dynamic' - Dynamic teams setting ============================================= _Description_: This function returns `true' if enabled, `false' otherwise. Here, `true' and `false' represent their language-specific counterparts. The dynamic team setting may be initialized at startup by the `OMP_DYNAMIC' environment variable or at runtime using `omp_set_dynamic'. If undefined, dynamic adjustment is disabled by default. _C/C++_: _Prototype_: `int omp_get_dynamic(void);' _Fortran_: _Interface_: `logical function omp_get_dynamic()' _See also_: *note omp_set_dynamic::, *note OMP_DYNAMIC:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.2.8.  File: libgomp.info, Node: omp_get_level, Next: omp_get_max_active_levels, Prev: omp_get_dynamic, Up: Runtime Library Routines 2.6 `omp_get_level' - Obtain the current nesting level ====================================================== _Description_: This function returns the nesting level for the parallel blocks, which enclose the calling call. _C/C++_ _Prototype_: `int omp_get_level(void);' _Fortran_: _Interface_: `integer function omp_level()' _See also_: *note omp_get_active_level:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.2.17.  File: libgomp.info, Node: omp_get_max_active_levels, Next: omp_get_max_threads, Prev: omp_get_level, Up: Runtime Library Routines 2.7 `omp_get_max_active_levels' - Maximum number of active regions ================================================================== _Description_: This function obtains the maximum allowed number of nested, active parallel regions. _C/C++_ _Prototype_: `int omp_get_max_active_levels(void);' _Fortran_: _Interface_: `integer function omp_get_max_active_levels()' _See also_: *note omp_set_max_active_levels::, *note omp_get_active_level:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.2.16.  File: libgomp.info, Node: omp_get_max_threads, Next: omp_get_nested, Prev: omp_get_max_active_levels, Up: Runtime Library Routines 2.8 `omp_get_max_threads' - Maximum number of threads of parallel region ======================================================================== _Description_: Return the maximum number of threads used for the current parallel region that does not use the clause `num_threads'. _C/C++_: _Prototype_: `int omp_get_max_threads(void);' _Fortran_: _Interface_: `integer function omp_get_max_threads()' _See also_: *note omp_set_num_threads::, *note omp_set_dynamic::, *note omp_get_thread_limit:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.2.3.  File: libgomp.info, Node: omp_get_nested, Next: omp_get_num_devices, Prev: omp_get_max_threads, Up: Runtime Library Routines 2.9 `omp_get_nested' - Nested parallel regions ============================================== _Description_: This function returns `true' if nested parallel regions are enabled, `false' otherwise. Here, `true' and `false' represent their language-specific counterparts. Nested parallel regions may be initialized at startup by the `OMP_NESTED' environment variable or at runtime using `omp_set_nested'. If undefined, nested parallel regions are disabled by default. _C/C++_: _Prototype_: `int omp_get_nested(void);' _Fortran_: _Interface_: `logical function omp_get_nested()' _See also_: *note omp_set_nested::, *note OMP_NESTED:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.2.11.  File: libgomp.info, Node: omp_get_num_devices, Next: omp_get_num_procs, Prev: omp_get_nested, Up: Runtime Library Routines 2.10 `omp_get_num_devices' - Number of target devices ===================================================== _Description_: Returns the number of target devices. _C/C++_: _Prototype_: `int omp_get_num_devices(void);' _Fortran_: _Interface_: `integer function omp_get_num_devices()' _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.2.25.  File: libgomp.info, Node: omp_get_num_procs, Next: omp_get_num_teams, Prev: omp_get_num_devices, Up: Runtime Library Routines 2.11 `omp_get_num_procs' - Number of processors online ====================================================== _Description_: Returns the number of processors online on that device. _C/C++_: _Prototype_: `int omp_get_num_procs(void);' _Fortran_: _Interface_: `integer function omp_get_num_procs()' _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.2.5.  File: libgomp.info, Node: omp_get_num_teams, Next: omp_get_num_threads, Prev: omp_get_num_procs, Up: Runtime Library Routines 2.12 `omp_get_num_teams' - Number of teams ========================================== _Description_: Returns the number of teams in the current team region. _C/C++_: _Prototype_: `int omp_get_num_teams(void);' _Fortran_: _Interface_: `integer function omp_get_num_teams()' _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.2.26.  File: libgomp.info, Node: omp_get_num_threads, Next: omp_get_proc_bind, Prev: omp_get_num_teams, Up: Runtime Library Routines 2.13 `omp_get_num_threads' - Size of the active team ==================================================== _Description_: Returns the number of threads in the current team. In a sequential section of the program `omp_get_num_threads' returns 1. The default team size may be initialized at startup by the `OMP_NUM_THREADS' environment variable. At runtime, the size of the current team may be set either by the `NUM_THREADS' clause or by `omp_set_num_threads'. If none of the above were used to define a specific value and `OMP_DYNAMIC' is disabled, one thread per CPU online is used. _C/C++_: _Prototype_: `int omp_get_num_threads(void);' _Fortran_: _Interface_: `integer function omp_get_num_threads()' _See also_: *note omp_get_max_threads::, *note omp_set_num_threads::, *note OMP_NUM_THREADS:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.2.2.  File: libgomp.info, Node: omp_get_proc_bind, Next: omp_get_schedule, Prev: omp_get_num_threads, Up: Runtime Library Routines 2.14 `omp_get_proc_bind' - Whether theads may be moved between CPUs =================================================================== _Description_: This functions returns the currently active thread affinity policy, which is set via `OMP_PROC_BIND'. Possible values are `omp_proc_bind_false', `omp_proc_bind_true', `omp_proc_bind_master', `omp_proc_bind_close' and `omp_proc_bind_spread'. _C/C++_: _Prototype_: `omp_proc_bind_t omp_get_proc_bind(void);' _Fortran_: _Interface_: `integer(kind=omp_proc_bind_kind) function omp_get_proc_bind()' _See also_: *note OMP_PROC_BIND::, *note OMP_PLACES::, *note GOMP_CPU_AFFINITY::, _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.2.22.  File: libgomp.info, Node: omp_get_schedule, Next: omp_get_team_num, Prev: omp_get_proc_bind, Up: Runtime Library Routines 2.15 `omp_get_schedule' - Obtain the runtime scheduling method ============================================================== _Description_: Obtain the runtime scheduling method. The KIND argument will be set to the value `omp_sched_static', `omp_sched_dynamic', `omp_sched_guided' or `omp_sched_auto'. The second argument, MODIFIER, is set to the chunk size. _C/C++_ _Prototype_: `void omp_get_schedule(omp_sched_t *kind, int *modifier);' _Fortran_: _Interface_: `subroutine omp_get_schedule(kind, modifier)' `integer(kind=omp_sched_kind) kind' `integer modifier' _See also_: *note omp_set_schedule::, *note OMP_SCHEDULE:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.2.13.  File: libgomp.info, Node: omp_get_team_num, Next: omp_get_team_size, Prev: omp_get_schedule, Up: Runtime Library Routines 2.16 `omp_get_team_num' - Get team number ========================================= _Description_: Returns the team number of the calling thread. _C/C++_: _Prototype_: `int omp_get_team_num(void);' _Fortran_: _Interface_: `integer function omp_get_team_num()' _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.2.27.  File: libgomp.info, Node: omp_get_team_size, Next: omp_get_thread_limit, Prev: omp_get_team_num, Up: Runtime Library Routines 2.17 `omp_get_team_size' - Number of threads in a team ====================================================== _Description_: This function returns the number of threads in a thread team to which either the current thread or its ancestor belongs. For values of LEVEL outside zero to `omp_get_level', -1 is returned; if LEVEL is zero, 1 is returned, and for `omp_get_level', the result is identical to `omp_get_num_threads'. _C/C++_: _Prototype_: `int omp_get_team_size(int level);' _Fortran_: _Interface_: `integer function omp_get_team_size(level)' `integer level' _See also_: *note omp_get_num_threads::, *note omp_get_level::, *note omp_get_ancestor_thread_num:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.2.19.  File: libgomp.info, Node: omp_get_thread_limit, Next: omp_get_thread_num, Prev: omp_get_team_size, Up: Runtime Library Routines 2.18 `omp_get_thread_limit' - Maximum number of threads ======================================================= _Description_: Return the maximum number of threads of the program. _C/C++_: _Prototype_: `int omp_get_thread_limit(void);' _Fortran_: _Interface_: `integer function omp_get_thread_limit()' _See also_: *note omp_get_max_threads::, *note OMP_THREAD_LIMIT:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.2.14.  File: libgomp.info, Node: omp_get_thread_num, Next: omp_in_parallel, Prev: omp_get_thread_limit, Up: Runtime Library Routines 2.19 `omp_get_thread_num' - Current thread ID ============================================= _Description_: Returns a unique thread identification number within the current team. In a sequential parts of the program, `omp_get_thread_num' always returns 0. In parallel regions the return value varies from 0 to `omp_get_num_threads'-1 inclusive. The return value of the master thread of a team is always 0. _C/C++_: _Prototype_: `int omp_get_thread_num(void);' _Fortran_: _Interface_: `integer function omp_get_thread_num()' _See also_: *note omp_get_num_threads::, *note omp_get_ancestor_thread_num:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.2.4.  File: libgomp.info, Node: omp_in_parallel, Next: omp_in_final, Prev: omp_get_thread_num, Up: Runtime Library Routines 2.20 `omp_in_parallel' - Whether a parallel region is active ============================================================ _Description_: This function returns `true' if currently running in parallel, `false' otherwise. Here, `true' and `false' represent their language-specific counterparts. _C/C++_: _Prototype_: `int omp_in_parallel(void);' _Fortran_: _Interface_: `logical function omp_in_parallel()' _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.2.6.  File: libgomp.info, Node: omp_in_final, Next: omp_is_initial_device, Prev: omp_in_parallel, Up: Runtime Library Routines 2.21 `omp_in_final' - Whether in final or included task region ============================================================== _Description_: This function returns `true' if currently running in a final or included task region, `false' otherwise. Here, `true' and `false' represent their language-specific counterparts. _C/C++_: _Prototype_: `int omp_in_final(void);' _Fortran_: _Interface_: `logical function omp_in_final()' _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.2.21.  File: libgomp.info, Node: omp_is_initial_device, Next: omp_set_default_device, Prev: omp_in_final, Up: Runtime Library Routines 2.22 `omp_is_initial_device' - Whether executing on the host device =================================================================== _Description_: This function returns `true' if currently running on the host device, `false' otherwise. Here, `true' and `false' represent their language-specific counterparts. _C/C++_: _Prototype_: `int omp_is_initial_device(void);' _Fortran_: _Interface_: `logical function omp_is_initial_device()' _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.2.28.  File: libgomp.info, Node: omp_set_default_device, Next: omp_set_dynamic, Prev: omp_is_initial_device, Up: Runtime Library Routines 2.23 `omp_set_default_device' - Set the default device for target regions ========================================================================= _Description_: Set the default device for target regions without device clause. The argument shall be a nonnegative device number. _C/C++_: _Prototype_: `void omp_set_default_device(int device_num);' _Fortran_: _Interface_: `subroutine omp_set_default_device(device_num)' `integer device_num' _See also_: *note OMP_DEFAULT_DEVICE::, *note omp_get_default_device:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.2.23.  File: libgomp.info, Node: omp_set_dynamic, Next: omp_set_max_active_levels, Prev: omp_set_default_device, Up: Runtime Library Routines 2.24 `omp_set_dynamic' - Enable/disable dynamic teams ===================================================== _Description_: Enable or disable the dynamic adjustment of the number of threads within a team. The function takes the language-specific equivalent of `true' and `false', where `true' enables dynamic adjustment of team sizes and `false' disables it. _C/C++_: _Prototype_: `void omp_set_dynamic(int dynamic_threads);' _Fortran_: _Interface_: `subroutine omp_set_dynamic(dynamic_threads)' `logical, intent(in) :: dynamic_threads' _See also_: *note OMP_DYNAMIC::, *note omp_get_dynamic:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.2.7.  File: libgomp.info, Node: omp_set_max_active_levels, Next: omp_set_nested, Prev: omp_set_dynamic, Up: Runtime Library Routines 2.25 `omp_set_max_active_levels' - Limits the number of active parallel regions =============================================================================== _Description_: This function limits the maximum allowed number of nested, active parallel regions. _C/C++_ _Prototype_: `void omp_set_max_active_levels(int max_levels);' _Fortran_: _Interface_: `subroutine omp_set_max_active_levels(max_levels)' `integer max_levels' _See also_: *note omp_get_max_active_levels::, *note omp_get_active_level:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.2.15.  File: libgomp.info, Node: omp_set_nested, Next: omp_set_num_threads, Prev: omp_set_max_active_levels, Up: Runtime Library Routines 2.26 `omp_set_nested' - Enable/disable nested parallel regions ============================================================== _Description_: Enable or disable nested parallel regions, i.e., whether team members are allowed to create new teams. The function takes the language-specific equivalent of `true' and `false', where `true' enables dynamic adjustment of team sizes and `false' disables it. _C/C++_: _Prototype_: `void omp_set_nested(int nested);' _Fortran_: _Interface_: `subroutine omp_set_nested(nested)' `logical, intent(in) :: nested' _See also_: *note OMP_NESTED::, *note omp_get_nested:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.2.10.  File: libgomp.info, Node: omp_set_num_threads, Next: omp_set_schedule, Prev: omp_set_nested, Up: Runtime Library Routines 2.27 `omp_set_num_threads' - Set upper team size limit ====================================================== _Description_: Specifies the number of threads used by default in subsequent parallel sections, if those do not specify a `num_threads' clause. The argument of `omp_set_num_threads' shall be a positive integer. _C/C++_: _Prototype_: `void omp_set_num_threads(int num_threads);' _Fortran_: _Interface_: `subroutine omp_set_num_threads(num_threads)' `integer, intent(in) :: num_threads' _See also_: *note OMP_NUM_THREADS::, *note omp_get_num_threads::, *note omp_get_max_threads:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.2.1.  File: libgomp.info, Node: omp_set_schedule, Next: omp_init_lock, Prev: omp_set_num_threads, Up: Runtime Library Routines 2.28 `omp_set_schedule' - Set the runtime scheduling method =========================================================== _Description_: Sets the runtime scheduling method. The KIND argument can have the value `omp_sched_static', `omp_sched_dynamic', `omp_sched_guided' or `omp_sched_auto'. Except for `omp_sched_auto', the chunk size is set to the value of MODIFIER if positive, or to the default value if zero or negative. For `omp_sched_auto' the MODIFIER argument is ignored. _C/C++_ _Prototype_: `void omp_set_schedule(omp_sched_t kind, int modifier);' _Fortran_: _Interface_: `subroutine omp_set_schedule(kind, modifier)' `integer(kind=omp_sched_kind) kind' `integer modifier' _See also_: *note omp_get_schedule:: *note OMP_SCHEDULE:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.2.12.  File: libgomp.info, Node: omp_init_lock, Next: omp_set_lock, Prev: omp_set_schedule, Up: Runtime Library Routines 2.29 `omp_init_lock' - Initialize simple lock ============================================= _Description_: Initialize a simple lock. After initialization, the lock is in an unlocked state. _C/C++_: _Prototype_: `void omp_init_lock(omp_lock_t *lock);' _Fortran_: _Interface_: `subroutine omp_init_lock(svar)' `integer(omp_lock_kind), intent(out) :: svar' _See also_: *note omp_destroy_lock:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.3.1.  File: libgomp.info, Node: omp_set_lock, Next: omp_test_lock, Prev: omp_init_lock, Up: Runtime Library Routines 2.30 `omp_set_lock' - Wait for and set simple lock ================================================== _Description_: Before setting a simple lock, the lock variable must be initialized by `omp_init_lock'. The calling thread is blocked until the lock is available. If the lock is already held by the current thread, a deadlock occurs. _C/C++_: _Prototype_: `void omp_set_lock(omp_lock_t *lock);' _Fortran_: _Interface_: `subroutine omp_set_lock(svar)' `integer(omp_lock_kind), intent(inout) :: svar' _See also_: *note omp_init_lock::, *note omp_test_lock::, *note omp_unset_lock:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.3.3.  File: libgomp.info, Node: omp_test_lock, Next: omp_unset_lock, Prev: omp_set_lock, Up: Runtime Library Routines 2.31 `omp_test_lock' - Test and set simple lock if available ============================================================ _Description_: Before setting a simple lock, the lock variable must be initialized by `omp_init_lock'. Contrary to `omp_set_lock', `omp_test_lock' does not block if the lock is not available. This function returns `true' upon success, `false' otherwise. Here, `true' and `false' represent their language-specific counterparts. _C/C++_: _Prototype_: `int omp_test_lock(omp_lock_t *lock);' _Fortran_: _Interface_: `logical function omp_test_lock(svar)' `integer(omp_lock_kind), intent(inout) :: svar' _See also_: *note omp_init_lock::, *note omp_set_lock::, *note omp_set_lock:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.3.5.  File: libgomp.info, Node: omp_unset_lock, Next: omp_destroy_lock, Prev: omp_test_lock, Up: Runtime Library Routines 2.32 `omp_unset_lock' - Unset simple lock ========================================= _Description_: A simple lock about to be unset must have been locked by `omp_set_lock' or `omp_test_lock' before. In addition, the lock must be held by the thread calling `omp_unset_lock'. Then, the lock becomes unlocked. If one or more threads attempted to set the lock before, one of them is chosen to, again, set the lock to itself. _C/C++_: _Prototype_: `void omp_unset_lock(omp_lock_t *lock);' _Fortran_: _Interface_: `subroutine omp_unset_lock(svar)' `integer(omp_lock_kind), intent(inout) :: svar' _See also_: *note omp_set_lock::, *note omp_test_lock:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.3.4.  File: libgomp.info, Node: omp_destroy_lock, Next: omp_init_nest_lock, Prev: omp_unset_lock, Up: Runtime Library Routines 2.33 `omp_destroy_lock' - Destroy simple lock ============================================= _Description_: Destroy a simple lock. In order to be destroyed, a simple lock must be in the unlocked state. _C/C++_: _Prototype_: `void omp_destroy_lock(omp_lock_t *lock);' _Fortran_: _Interface_: `subroutine omp_destroy_lock(svar)' `integer(omp_lock_kind), intent(inout) :: svar' _See also_: *note omp_init_lock:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.3.2.  File: libgomp.info, Node: omp_init_nest_lock, Next: omp_set_nest_lock, Prev: omp_destroy_lock, Up: Runtime Library Routines 2.34 `omp_init_nest_lock' - Initialize nested lock ================================================== _Description_: Initialize a nested lock. After initialization, the lock is in an unlocked state and the nesting count is set to zero. _C/C++_: _Prototype_: `void omp_init_nest_lock(omp_nest_lock_t *lock);' _Fortran_: _Interface_: `subroutine omp_init_nest_lock(nvar)' `integer(omp_nest_lock_kind), intent(out) :: nvar' _See also_: *note omp_destroy_nest_lock:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.3.1.  File: libgomp.info, Node: omp_set_nest_lock, Next: omp_test_nest_lock, Prev: omp_init_nest_lock, Up: Runtime Library Routines 2.35 `omp_set_nest_lock' - Wait for and set nested lock ======================================================= _Description_: Before setting a nested lock, the lock variable must be initialized by `omp_init_nest_lock'. The calling thread is blocked until the lock is available. If the lock is already held by the current thread, the nesting count for the lock is incremented. _C/C++_: _Prototype_: `void omp_set_nest_lock(omp_nest_lock_t *lock);' _Fortran_: _Interface_: `subroutine omp_set_nest_lock(nvar)' `integer(omp_nest_lock_kind), intent(inout) :: nvar' _See also_: *note omp_init_nest_lock::, *note omp_unset_nest_lock:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.3.3.  File: libgomp.info, Node: omp_test_nest_lock, Next: omp_unset_nest_lock, Prev: omp_set_nest_lock, Up: Runtime Library Routines 2.36 `omp_test_nest_lock' - Test and set nested lock if available ================================================================= _Description_: Before setting a nested lock, the lock variable must be initialized by `omp_init_nest_lock'. Contrary to `omp_set_nest_lock', `omp_test_nest_lock' does not block if the lock is not available. If the lock is already held by the current thread, the new nesting count is returned. Otherwise, the return value equals zero. _C/C++_: _Prototype_: `int omp_test_nest_lock(omp_nest_lock_t *lock);' _Fortran_: _Interface_: `logical function omp_test_nest_lock(nvar)' `integer(omp_nest_lock_kind), intent(inout) :: nvar' _See also_: *note omp_init_lock::, *note omp_set_lock::, *note omp_set_lock:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.3.5.  File: libgomp.info, Node: omp_unset_nest_lock, Next: omp_destroy_nest_lock, Prev: omp_test_nest_lock, Up: Runtime Library Routines 2.37 `omp_unset_nest_lock' - Unset nested lock ============================================== _Description_: A nested lock about to be unset must have been locked by `omp_set_nested_lock' or `omp_test_nested_lock' before. In addition, the lock must be held by the thread calling `omp_unset_nested_lock'. If the nesting count drops to zero, the lock becomes unlocked. If one ore more threads attempted to set the lock before, one of them is chosen to, again, set the lock to itself. _C/C++_: _Prototype_: `void omp_unset_nest_lock(omp_nest_lock_t *lock);' _Fortran_: _Interface_: `subroutine omp_unset_nest_lock(nvar)' `integer(omp_nest_lock_kind), intent(inout) :: nvar' _See also_: *note omp_set_nest_lock:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.3.4.  File: libgomp.info, Node: omp_destroy_nest_lock, Next: omp_get_wtick, Prev: omp_unset_nest_lock, Up: Runtime Library Routines 2.38 `omp_destroy_nest_lock' - Destroy nested lock ================================================== _Description_: Destroy a nested lock. In order to be destroyed, a nested lock must be in the unlocked state and its nesting count must equal zero. _C/C++_: _Prototype_: `void omp_destroy_nest_lock(omp_nest_lock_t *);' _Fortran_: _Interface_: `subroutine omp_destroy_nest_lock(nvar)' `integer(omp_nest_lock_kind), intent(inout) :: nvar' _See also_: *note omp_init_lock:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.3.2.  File: libgomp.info, Node: omp_get_wtick, Next: omp_get_wtime, Prev: omp_destroy_nest_lock, Up: Runtime Library Routines 2.39 `omp_get_wtick' - Get timer precision ========================================== _Description_: Gets the timer precision, i.e., the number of seconds between two successive clock ticks. _C/C++_: _Prototype_: `double omp_get_wtick(void);' _Fortran_: _Interface_: `double precision function omp_get_wtick()' _See also_: *note omp_get_wtime:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.4.2.  File: libgomp.info, Node: omp_get_wtime, Prev: omp_get_wtick, Up: Runtime Library Routines 2.40 `omp_get_wtime' - Elapsed wall clock time ============================================== _Description_: Elapsed wall clock time in seconds. The time is measured per thread, no guarantee can be made that two distinct threads measure the same time. Time is measured from some "time in the past", which is an arbitrary time guaranteed not to change during the execution of the program. _C/C++_: _Prototype_: `double omp_get_wtime(void);' _Fortran_: _Interface_: `double precision function omp_get_wtime()' _See also_: *note omp_get_wtick:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 3.4.1.  File: libgomp.info, Node: Environment Variables, Next: The libgomp ABI, Prev: Runtime Library Routines, Up: Top 3 Environment Variables *********************** The environment variables which beginning with `OMP_' are defined by section 4 of the OpenMP specification in version 4.0, while those beginning with `GOMP_' are GNU extensions. * Menu: * OMP_CANCELLATION:: Set whether cancellation is activated * OMP_DISPLAY_ENV:: Show OpenMP version and environment variables * OMP_DEFAULT_DEVICE:: Set the device used in target regions * OMP_DYNAMIC:: Dynamic adjustment of threads * OMP_MAX_ACTIVE_LEVELS:: Set the maximum number of nested parallel regions * OMP_NESTED:: Nested parallel regions * OMP_NUM_THREADS:: Specifies the number of threads to use * OMP_PROC_BIND:: Whether theads may be moved between CPUs * OMP_PLACES:: Specifies on which CPUs the theads should be placed * OMP_STACKSIZE:: Set default thread stack size * OMP_SCHEDULE:: How threads are scheduled * OMP_THREAD_LIMIT:: Set the maximum number of threads * OMP_WAIT_POLICY:: How waiting threads are handled * GOMP_CPU_AFFINITY:: Bind threads to specific CPUs * GOMP_DEBUG:: Enable debugging output * GOMP_STACKSIZE:: Set default thread stack size * GOMP_SPINCOUNT:: Set the busy-wait spin count  File: libgomp.info, Node: OMP_CANCELLATION, Next: OMP_DISPLAY_ENV, Up: Environment Variables 3.1 `OMP_CANCELLATION' - Set whether cancellation is activated ============================================================== _Description_: If set to `TRUE', the cancellation is activated. If set to `FALSE' or if unset, cancellation is disabled and the `cancel' construct is ignored. _See also_: *note omp_get_cancellation:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 4.11  File: libgomp.info, Node: OMP_DISPLAY_ENV, Next: OMP_DEFAULT_DEVICE, Prev: OMP_CANCELLATION, Up: Environment Variables 3.2 `OMP_DISPLAY_ENV' - Show OpenMP version and environment variables ===================================================================== _Description_: If set to `TRUE', the OpenMP version number and the values associated with the OpenMP environment variables are printed to `stderr'. If set to `VERBOSE', it additionally shows the value of the environment variables which are GNU extensions. If undefined or set to `FALSE', this information will not be shown. _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 4.12  File: libgomp.info, Node: OMP_DEFAULT_DEVICE, Next: OMP_DYNAMIC, Prev: OMP_DISPLAY_ENV, Up: Environment Variables 3.3 `OMP_DEFAULT_DEVICE' - Set the device used in target regions ================================================================ _Description_: Set to choose the device which is used in a `target' region, unless the value is overridden by `omp_set_default_device' or by a `device' clause. The value shall be the nonnegative device number. If no device with the given device number exists, the code is executed on the host. If unset, device number 0 will be used. _See also_: *note omp_get_default_device::, *note omp_set_default_device::, _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 4.11  File: libgomp.info, Node: OMP_DYNAMIC, Next: OMP_MAX_ACTIVE_LEVELS, Prev: OMP_DEFAULT_DEVICE, Up: Environment Variables 3.4 `OMP_DYNAMIC' - Dynamic adjustment of threads ================================================= _Description_: Enable or disable the dynamic adjustment of the number of threads within a team. The value of this environment variable shall be `TRUE' or `FALSE'. If undefined, dynamic adjustment is disabled by default. _See also_: *note omp_set_dynamic:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 4.3  File: libgomp.info, Node: OMP_MAX_ACTIVE_LEVELS, Next: OMP_NESTED, Prev: OMP_DYNAMIC, Up: Environment Variables 3.5 `OMP_MAX_ACTIVE_LEVELS' - Set the maximum number of nested parallel regions =============================================================================== _Description_: Specifies the initial value for the maximum number of nested parallel regions. The value of this variable shall be a positive integer. If undefined, the number of active levels is unlimited. _See also_: *note omp_set_max_active_levels:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 4.9  File: libgomp.info, Node: OMP_NESTED, Next: OMP_NUM_THREADS, Prev: OMP_MAX_ACTIVE_LEVELS, Up: Environment Variables 3.6 `OMP_NESTED' - Nested parallel regions ========================================== _Description_: Enable or disable nested parallel regions, i.e., whether team members are allowed to create new teams. The value of this environment variable shall be `TRUE' or `FALSE'. If undefined, nested parallel regions are disabled by default. _See also_: *note omp_set_nested:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 4.6  File: libgomp.info, Node: OMP_NUM_THREADS, Next: OMP_PROC_BIND, Prev: OMP_NESTED, Up: Environment Variables 3.7 `OMP_NUM_THREADS' - Specifies the number of threads to use ============================================================== _Description_: Specifies the default number of threads to use in parallel regions. The value of this variable shall be a comma-separated list of positive integers; the value specified the number of threads to use for the corresponding nested level. If undefined one thread per CPU is used. _See also_: *note omp_set_num_threads:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 4.2  File: libgomp.info, Node: OMP_PROC_BIND, Next: OMP_PLACES, Prev: OMP_NUM_THREADS, Up: Environment Variables 3.8 `OMP_PROC_BIND' - Whether theads may be moved between CPUs ============================================================== _Description_: Specifies whether threads may be moved between processors. If set to `TRUE', OpenMP theads should not be moved; if set to `FALSE' they may be moved. Alternatively, a comma separated list with the values `MASTER', `CLOSE' and `SPREAD' can be used to specify the thread affinity policy for the corresponding nesting level. With `MASTER' the worker threads are in the same place partition as the master thread. With `CLOSE' those are kept close to the master thread in contiguous place partitions. And with `SPREAD' a sparse distribution across the place partitions is used. When undefined, `OMP_PROC_BIND' defaults to `TRUE' when `OMP_PLACES' or `GOMP_CPU_AFFINITY' is set and `FALSE' otherwise. _See also_: *note OMP_PLACES::, *note GOMP_CPU_AFFINITY::, *note omp_get_proc_bind:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 4.4  File: libgomp.info, Node: OMP_PLACES, Next: OMP_STACKSIZE, Prev: OMP_PROC_BIND, Up: Environment Variables 3.9 `OMP_PLACES' - Specifies on which CPUs the theads should be placed ====================================================================== _Description_: The thread placement can be either specified using an abstract name or by an explicit list of the places. The abstract names `threads', `cores' and `sockets' can be optionally followed by a positive number in parentheses, which denotes the how many places shall be created. With `threads' each place corresponds to a single hardware thread; `cores' to a single core with the corresponding number of hardware threads; and with `sockets' the place corresponds to a single socket. The resulting placement can be shown by setting the `OMP_DISPLAY_ENV' environment variable. Alternatively, the placement can be specified explicitly as comma-separated list of places. A place is specified by set of nonnegative numbers in curly braces, denoting the denoting the hardware threads. The hardware threads belonging to a place can either be specified as comma-separated list of nonnegative thread numbers or using an interval. Multiple places can also be either specified by a comma-separated list of places or by an interval. To specify an interval, a colon followed by the count is placed after after the hardware thread number or the place. Optionally, the length can be followed by a colon and the stride number - otherwise a unit stride is assumed. For instance, the following specifies the same places list: `"{0,1,2}, {3,4,6}, {7,8,9}, {10,11,12}"'; `"{0:3}, {3:3}, {7:3}, {10:3}"'; and `"{0:2}:4:3"'. If `OMP_PLACES' and `GOMP_CPU_AFFINITY' are unset and `OMP_PROC_BIND' is either unset or `false', threads may be moved between CPUs following no placement policy. _See also_: *note OMP_PROC_BIND::, *note GOMP_CPU_AFFINITY::, *note omp_get_proc_bind::, *note OMP_DISPLAY_ENV:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 4.5  File: libgomp.info, Node: OMP_STACKSIZE, Next: OMP_SCHEDULE, Prev: OMP_PLACES, Up: Environment Variables 3.10 `OMP_STACKSIZE' - Set default thread stack size ==================================================== _Description_: Set the default thread stack size in kilobytes, unless the number is suffixed by `B', `K', `M' or `G', in which case the size is, respectively, in bytes, kilobytes, megabytes or gigabytes. This is different from `pthread_attr_setstacksize' which gets the number of bytes as an argument. If the stack size cannot be set due to system constraints, an error is reported and the initial stack size is left unchanged. If undefined, the stack size is system dependent. _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 4.7  File: libgomp.info, Node: OMP_SCHEDULE, Next: OMP_THREAD_LIMIT, Prev: OMP_STACKSIZE, Up: Environment Variables 3.11 `OMP_SCHEDULE' - How threads are scheduled =============================================== _Description_: Allows to specify `schedule type' and `chunk size'. The value of the variable shall have the form: `type[,chunk]' where `type' is one of `static', `dynamic', `guided' or `auto' The optional `chunk' size shall be a positive integer. If undefined, dynamic scheduling and a chunk size of 1 is used. _See also_: *note omp_set_schedule:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Sections 2.7.1 and 4.1  File: libgomp.info, Node: OMP_THREAD_LIMIT, Next: OMP_WAIT_POLICY, Prev: OMP_SCHEDULE, Up: Environment Variables 3.12 `OMP_THREAD_LIMIT' - Set the maximum number of threads =========================================================== _Description_: Specifies the number of threads to use for the whole program. The value of this variable shall be a positive integer. If undefined, the number of threads is not limited. _See also_: *note OMP_NUM_THREADS::, *note omp_get_thread_limit:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 4.10  File: libgomp.info, Node: OMP_WAIT_POLICY, Next: GOMP_CPU_AFFINITY, Prev: OMP_THREAD_LIMIT, Up: Environment Variables 3.13 `OMP_WAIT_POLICY' - How waiting threads are handled ======================================================== _Description_: Specifies whether waiting threads should be active or passive. If the value is `PASSIVE', waiting threads should not consume CPU power while waiting; while the value is `ACTIVE' specifies that they should. If undefined, threads wait actively for a short time before waiting passively. _See also_: *note GOMP_SPINCOUNT:: _Reference_: OpenMP specification v4.0 (http://www.openmp.org/), Section 4.8  File: libgomp.info, Node: GOMP_CPU_AFFINITY, Next: GOMP_DEBUG, Prev: OMP_WAIT_POLICY, Up: Environment Variables 3.14 `GOMP_CPU_AFFINITY' - Bind threads to specific CPUs ======================================================== _Description_: Binds threads to specific CPUs. The variable should contain a space-separated or comma-separated list of CPUs. This list may contain different kinds of entries: either single CPU numbers in any order, a range of CPUs (M-N) or a range with some stride (M-N:S). CPU numbers are zero based. For example, `GOMP_CPU_AFFINITY="0 3 1-2 4-15:2"' will bind the initial thread to CPU 0, the second to CPU 3, the third to CPU 1, the fourth to CPU 2, the fifth to CPU 4, the sixth through tenth to CPUs 6, 8, 10, 12, and 14 respectively and then start assigning back from the beginning of the list. `GOMP_CPU_AFFINITY=0' binds all threads to CPU 0. There is no libgomp library routine to determine whether a CPU affinity specification is in effect. As a workaround, language-specific library functions, e.g., `getenv' in C or `GET_ENVIRONMENT_VARIABLE' in Fortran, may be used to query the setting of the `GOMP_CPU_AFFINITY' environment variable. A defined CPU affinity on startup cannot be changed or disabled during the runtime of the application. If both `GOMP_CPU_AFFINITY' and `OMP_PROC_BIND' are set, `OMP_PROC_BIND' has a higher precedence. If neither has been set and `OMP_PROC_BIND' is unset, or when `OMP_PROC_BIND' is set to `FALSE', the host system will handle the assignment of threads to CPUs. _See also_: *note OMP_PLACES::, *note OMP_PROC_BIND::  File: libgomp.info, Node: GOMP_DEBUG, Next: GOMP_STACKSIZE, Prev: GOMP_CPU_AFFINITY, Up: Environment Variables 3.15 `GOMP_DEBUG' - Enable debugging output =========================================== _Description_: Enable debugging output. The variable should be set to `0' (disabled, also the default if not set), or `1' (enabled). If enabled, some debugging output will be printed during execution. This is currently not specified in more detail, and subject to change.  File: libgomp.info, Node: GOMP_STACKSIZE, Next: GOMP_SPINCOUNT, Prev: GOMP_DEBUG, Up: Environment Variables 3.16 `GOMP_STACKSIZE' - Set default thread stack size ===================================================== _Description_: Set the default thread stack size in kilobytes. This is different from `pthread_attr_setstacksize' which gets the number of bytes as an argument. If the stack size cannot be set due to system constraints, an error is reported and the initial stack size is left unchanged. If undefined, the stack size is system dependent. _See also_: *note OMP_STACKSIZE:: _Reference_: GCC Patches Mailinglist (http://gcc.gnu.org/ml/gcc-patches/2006-06/msg00493.html), GCC Patches Mailinglist (http://gcc.gnu.org/ml/gcc-patches/2006-06/msg00496.html)  File: libgomp.info, Node: GOMP_SPINCOUNT, Prev: GOMP_STACKSIZE, Up: Environment Variables 3.17 `GOMP_SPINCOUNT' - Set the busy-wait spin count ==================================================== _Description_: Determines how long a threads waits actively with consuming CPU power before waiting passively without consuming CPU power. The value may be either `INFINITE', `INFINITY' to always wait actively or an integer which gives the number of spins of the busy-wait loop. The integer may optionally be followed by the following suffixes acting as multiplication factors: `k' (kilo, thousand), `M' (mega, million), `G' (giga, billion), or `T' (tera, trillion). If undefined, 0 is used when `OMP_WAIT_POLICY' is `PASSIVE', 300,000 is used when `OMP_WAIT_POLICY' is undefined and 30 billion is used when `OMP_WAIT_POLICY' is `ACTIVE'. If there are more OpenMP threads than available CPUs, 1000 and 100 spins are used for `OMP_WAIT_POLICY' being `ACTIVE' or undefined, respectively; unless the `GOMP_SPINCOUNT' is lower or `OMP_WAIT_POLICY' is `PASSIVE'. _See also_: *note OMP_WAIT_POLICY::  File: libgomp.info, Node: The libgomp ABI, Next: Reporting Bugs, Prev: Environment Variables, Up: Top 4 The libgomp ABI ***************** The following sections present notes on the external ABI as presented by libgomp. Only maintainers should need them. * Menu: * Implementing MASTER construct:: * Implementing CRITICAL construct:: * Implementing ATOMIC construct:: * Implementing FLUSH construct:: * Implementing BARRIER construct:: * Implementing THREADPRIVATE construct:: * Implementing PRIVATE clause:: * Implementing FIRSTPRIVATE LASTPRIVATE COPYIN and COPYPRIVATE clauses:: * Implementing REDUCTION clause:: * Implementing PARALLEL construct:: * Implementing FOR construct:: * Implementing ORDERED construct:: * Implementing SECTIONS construct:: * Implementing SINGLE construct::  File: libgomp.info, Node: Implementing MASTER construct, Next: Implementing CRITICAL construct, Up: The libgomp ABI 4.1 Implementing MASTER construct ================================= if (omp_get_thread_num () == 0) block Alternately, we generate two copies of the parallel subfunction and only include this in the version run by the master thread. Surely this is not worthwhile though...  File: libgomp.info, Node: Implementing CRITICAL construct, Next: Implementing ATOMIC construct, Prev: Implementing MASTER construct, Up: The libgomp ABI 4.2 Implementing CRITICAL construct =================================== Without a specified name, void GOMP_critical_start (void); void GOMP_critical_end (void); so that we don't get COPY relocations from libgomp to the main application. With a specified name, use omp_set_lock and omp_unset_lock with name being transformed into a variable declared like omp_lock_t gomp_critical_user_ __attribute__((common)) Ideally the ABI would specify that all zero is a valid unlocked state, and so we wouldn't need to initialize this at startup.  File: libgomp.info, Node: Implementing ATOMIC construct, Next: Implementing FLUSH construct, Prev: Implementing CRITICAL construct, Up: The libgomp ABI 4.3 Implementing ATOMIC construct ================================= The target should implement the `__sync' builtins. Failing that we could add void GOMP_atomic_enter (void) void GOMP_atomic_exit (void) which reuses the regular lock code, but with yet another lock object private to the library.  File: libgomp.info, Node: Implementing FLUSH construct, Next: Implementing BARRIER construct, Prev: Implementing ATOMIC construct, Up: The libgomp ABI 4.4 Implementing FLUSH construct ================================ Expands to the `__sync_synchronize' builtin.  File: libgomp.info, Node: Implementing BARRIER construct, Next: Implementing THREADPRIVATE construct, Prev: Implementing FLUSH construct, Up: The libgomp ABI 4.5 Implementing BARRIER construct ================================== void GOMP_barrier (void)  File: libgomp.info, Node: Implementing THREADPRIVATE construct, Next: Implementing PRIVATE clause, Prev: Implementing BARRIER construct, Up: The libgomp ABI 4.6 Implementing THREADPRIVATE construct ======================================== In _most_ cases we can map this directly to `__thread'. Except that OMP allows constructors for C++ objects. We can either refuse to support this (how often is it used?) or we can implement something akin to .ctors. Even more ideally, this ctor feature is handled by extensions to the main pthreads library. Failing that, we can have a set of entry points to register ctor functions to be called.  File: libgomp.info, Node: Implementing PRIVATE clause, Next: Implementing FIRSTPRIVATE LASTPRIVATE COPYIN and COPYPRIVATE clauses, Prev: Implementing THREADPRIVATE construct, Up: The libgomp ABI 4.7 Implementing PRIVATE clause =============================== In association with a PARALLEL, or within the lexical extent of a PARALLEL block, the variable becomes a local variable in the parallel subfunction. In association with FOR or SECTIONS blocks, create a new automatic variable within the current function. This preserves the semantic of new variable creation.  File: libgomp.info, Node: Implementing FIRSTPRIVATE LASTPRIVATE COPYIN and COPYPRIVATE clauses, Next: Implementing REDUCTION clause, Prev: Implementing PRIVATE clause, Up: The libgomp ABI 4.8 Implementing FIRSTPRIVATE LASTPRIVATE COPYIN and COPYPRIVATE clauses ======================================================================== This seems simple enough for PARALLEL blocks. Create a private struct for communicating between the parent and subfunction. In the parent, copy in values for scalar and "small" structs; copy in addresses for others TREE_ADDRESSABLE types. In the subfunction, copy the value into the local variable. It is not clear what to do with bare FOR or SECTION blocks. The only thing I can figure is that we do something like: #pragma omp for firstprivate(x) lastprivate(y) for (int i = 0; i < n; ++i) body; which becomes { int x = x, y; // for stuff if (i == n) y = y; } where the "x=x" and "y=y" assignments actually have different uids for the two variables, i.e. not something you could write directly in C. Presumably this only makes sense if the "outer" x and y are global variables. COPYPRIVATE would work the same way, except the structure broadcast would have to happen via SINGLE machinery instead.  File: libgomp.info, Node: Implementing REDUCTION clause, Next: Implementing PARALLEL construct, Prev: Implementing FIRSTPRIVATE LASTPRIVATE COPYIN and COPYPRIVATE clauses, Up: The libgomp ABI 4.9 Implementing REDUCTION clause ================================= The private struct mentioned in the previous section should have a pointer to an array of the type of the variable, indexed by the thread's TEAM_ID. The thread stores its final value into the array, and after the barrier, the master thread iterates over the array to collect the values.  File: libgomp.info, Node: Implementing PARALLEL construct, Next: Implementing FOR construct, Prev: Implementing REDUCTION clause, Up: The libgomp ABI 4.10 Implementing PARALLEL construct ==================================== #pragma omp parallel { body; } becomes void subfunction (void *data) { use data; body; } setup data; GOMP_parallel_start (subfunction, &data, num_threads); subfunction (&data); GOMP_parallel_end (); void GOMP_parallel_start (void (*fn)(void *), void *data, unsigned num_threads) The FN argument is the subfunction to be run in parallel. The DATA argument is a pointer to a structure used to communicate data in and out of the subfunction, as discussed above with respect to FIRSTPRIVATE et al. The NUM_THREADS argument is 1 if an IF clause is present and false, or the value of the NUM_THREADS clause, if present, or 0. The function needs to create the appropriate number of threads and/or launch them from the dock. It needs to create the team structure and assign team ids. void GOMP_parallel_end (void) Tears down the team and returns us to the previous `omp_in_parallel()' state.  File: libgomp.info, Node: Implementing FOR construct, Next: Implementing ORDERED construct, Prev: Implementing PARALLEL construct, Up: The libgomp ABI 4.11 Implementing FOR construct =============================== #pragma omp parallel for for (i = lb; i <= ub; i++) body; becomes void subfunction (void *data) { long _s0, _e0; while (GOMP_loop_static_next (&_s0, &_e0)) { long _e1 = _e0, i; for (i = _s0; i < _e1; i++) body; } GOMP_loop_end_nowait (); } GOMP_parallel_loop_static (subfunction, NULL, 0, lb, ub+1, 1, 0); subfunction (NULL); GOMP_parallel_end (); #pragma omp for schedule(runtime) for (i = 0; i < n; i++) body; becomes { long i, _s0, _e0; if (GOMP_loop_runtime_start (0, n, 1, &_s0, &_e0)) do { long _e1 = _e0; for (i = _s0, i < _e0; i++) body; } while (GOMP_loop_runtime_next (&_s0, _&e0)); GOMP_loop_end (); } Note that while it looks like there is trickiness to propagating a non-constant STEP, there isn't really. We're explicitly allowed to evaluate it as many times as we want, and any variables involved should automatically be handled as PRIVATE or SHARED like any other variables. So the expression should remain evaluable in the subfunction. We can also pull it into a local variable if we like, but since its supposed to remain unchanged, we can also not if we like. If we have SCHEDULE(STATIC), and no ORDERED, then we ought to be able to get away with no work-sharing context at all, since we can simply perform the arithmetic directly in each thread to divide up the iterations. Which would mean that we wouldn't need to call any of these routines. There are separate routines for handling loops with an ORDERED clause. Bookkeeping for that is non-trivial...  File: libgomp.info, Node: Implementing ORDERED construct, Next: Implementing SECTIONS construct, Prev: Implementing FOR construct, Up: The libgomp ABI 4.12 Implementing ORDERED construct =================================== void GOMP_ordered_start (void) void GOMP_ordered_end (void)  File: libgomp.info, Node: Implementing SECTIONS construct, Next: Implementing SINGLE construct, Prev: Implementing ORDERED construct, Up: The libgomp ABI 4.13 Implementing SECTIONS construct ==================================== A block as #pragma omp sections { #pragma omp section stmt1; #pragma omp section stmt2; #pragma omp section stmt3; } becomes for (i = GOMP_sections_start (3); i != 0; i = GOMP_sections_next ()) switch (i) { case 1: stmt1; break; case 2: stmt2; break; case 3: stmt3; break; } GOMP_barrier ();  File: libgomp.info, Node: Implementing SINGLE construct, Prev: Implementing SECTIONS construct, Up: The libgomp ABI 4.14 Implementing SINGLE construct ================================== A block like #pragma omp single { body; } becomes if (GOMP_single_start ()) body; GOMP_barrier (); while #pragma omp single copyprivate(x) body; becomes datap = GOMP_single_copy_start (); if (datap == NULL) { body; data.x = x; GOMP_single_copy_end (&data); } else x = datap->x; GOMP_barrier ();  File: libgomp.info, Node: Reporting Bugs, Next: Copying, Prev: The libgomp ABI, Up: Top 5 Reporting Bugs **************** Bugs in the GNU Offloading and Multi Processing Runtime Library should be reported via Bugzilla (http://gcc.gnu.org/bugzilla/). 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The terms of this License will continue to apply to the part which is the covered work, but the special requirements of the GNU Affero General Public License, section 13, concerning interaction through a network will apply to the combination as such. 14. Revised Versions of this License. The Free Software Foundation may publish revised and/or new versions of the GNU General Public License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns. Each version is given a distinguishing version number. If the Program specifies that a certain numbered version of the GNU General Public License "or any later version" applies to it, you have the option of following the terms and conditions either of that numbered version or of any later version published by the Free Software Foundation. If the Program does not specify a version number of the GNU General Public License, you may choose any version ever published by the Free Software Foundation. If the Program specifies that a proxy can decide which future versions of the GNU General Public License can be used, that proxy's public statement of acceptance of a version permanently authorizes you to choose that version for the Program. Later license versions may give you additional or different permissions. However, no additional obligations are imposed on any author or copyright holder as a result of your choosing to follow a later version. 15. Disclaimer of Warranty. THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 16. Limitation of Liability. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. 17. Interpretation of Sections 15 and 16. If the disclaimer of warranty and limitation of liability provided above cannot be given local legal effect according to their terms, reviewing courts shall apply local law that most closely approximates an absolute waiver of all civil liability in connection with the Program, unless a warranty or assumption of liability accompanies a copy of the Program in return for a fee. END OF TERMS AND CONDITIONS =========================== How to Apply These Terms to Your New Programs ============================================= If you develop a new program, and you want it to be of the greatest possible use to the public, the best way to achieve this is to make it free software which everyone can redistribute and change under these terms. To do so, attach the following notices to the program. It is safest to attach them to the start of each source file to most effectively state the exclusion of warranty; and each file should have at least the "copyright" line and a pointer to where the full notice is found. ONE LINE TO GIVE THE PROGRAM'S NAME AND A BRIEF IDEA OF WHAT IT DOES. Copyright (C) YEAR NAME OF AUTHOR This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see `http://www.gnu.org/licenses/'. Also add information on how to contact you by electronic and paper mail. If the program does terminal interaction, make it output a short notice like this when it starts in an interactive mode: PROGRAM Copyright (C) YEAR NAME OF AUTHOR This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details. The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, your program's commands might be different; for a GUI interface, you would use an "about box". You should also get your employer (if you work as a programmer) or school, if any, to sign a "copyright disclaimer" for the program, if necessary. For more information on this, and how to apply and follow the GNU GPL, see `http://www.gnu.org/licenses/'. The GNU General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Lesser General Public License instead of this License. But first, please read `http://www.gnu.org/philosophy/why-not-lgpl.html'.  File: libgomp.info, Node: GNU Free Documentation License, Next: Funding, Prev: Copying, Up: Top GNU Free Documentation License ****************************** Version 1.3, 3 November 2008 Copyright (C) 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc. `http://fsf.org/' Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. 0. PREAMBLE The purpose of this License is to make a manual, textbook, or other functional and useful document "free" in the sense of freedom: to assure everyone the effective freedom to copy and redistribute it, with or without modifying it, either commercially or noncommercially. Secondarily, this License preserves for the author and publisher a way to get credit for their work, while not being considered responsible for modifications made by others. This License is a kind of "copyleft", which means that derivative works of the document must themselves be free in the same sense. It complements the GNU General Public License, which is a copyleft license designed for free software. We have designed this License in order to use it for manuals for free software, because free software needs free documentation: a free program should come with manuals providing the same freedoms that the software does. But this License is not limited to software manuals; it can be used for any textual work, regardless of subject matter or whether it is published as a printed book. We recommend this License principally for works whose purpose is instruction or reference. 1. APPLICABILITY AND DEFINITIONS This License applies to any manual or other work, in any medium, that contains a notice placed by the copyright holder saying it can be distributed under the terms of this License. Such a notice grants a world-wide, royalty-free license, unlimited in duration, to use that work under the conditions stated herein. The "Document", below, refers to any such manual or work. Any member of the public is a licensee, and is addressed as "you". You accept the license if you copy, modify or distribute the work in a way requiring permission under copyright law. A "Modified Version" of the Document means any work containing the Document or a portion of it, either copied verbatim, or with modifications and/or translated into another language. A "Secondary Section" is a named appendix or a front-matter section of the Document that deals exclusively with the relationship of the publishers or authors of the Document to the Document's overall subject (or to related matters) and contains nothing that could fall directly within that overall subject. (Thus, if the Document is in part a textbook of mathematics, a Secondary Section may not explain any mathematics.) The relationship could be a matter of historical connection with the subject or with related matters, or of legal, commercial, philosophical, ethical or political position regarding them. The "Invariant Sections" are certain Secondary Sections whose titles are designated, as being those of Invariant Sections, in the notice that says that the Document is released under this License. If a section does not fit the above definition of Secondary then it is not allowed to be designated as Invariant. The Document may contain zero Invariant Sections. If the Document does not identify any Invariant Sections then there are none. The "Cover Texts" are certain short passages of text that are listed, as Front-Cover Texts or Back-Cover Texts, in the notice that says that the Document is released under this License. A Front-Cover Text may be at most 5 words, and a Back-Cover Text may be at most 25 words. A "Transparent" copy of the Document means a machine-readable copy, represented in a format whose specification is available to the general public, that is suitable for revising the document straightforwardly with generic text editors or (for images composed of pixels) generic paint programs or (for drawings) some widely available drawing editor, and that is suitable for input to text formatters or for automatic translation to a variety of formats suitable for input to text formatters. A copy made in an otherwise Transparent file format whose markup, or absence of markup, has been arranged to thwart or discourage subsequent modification by readers is not Transparent. An image format is not Transparent if used for any substantial amount of text. A copy that is not "Transparent" is called "Opaque". Examples of suitable formats for Transparent copies include plain ASCII without markup, Texinfo input format, LaTeX input format, SGML or XML using a publicly available DTD, and standard-conforming simple HTML, PostScript or PDF designed for human modification. Examples of transparent image formats include PNG, XCF and JPG. Opaque formats include proprietary formats that can be read and edited only by proprietary word processors, SGML or XML for which the DTD and/or processing tools are not generally available, and the machine-generated HTML, PostScript or PDF produced by some word processors for output purposes only. The "Title Page" means, for a printed book, the title page itself, plus such following pages as are needed to hold, legibly, the material this License requires to appear in the title page. For works in formats which do not have any title page as such, "Title Page" means the text near the most prominent appearance of the work's title, preceding the beginning of the body of the text. The "publisher" means any person or entity that distributes copies of the Document to the public. A section "Entitled XYZ" means a named subunit of the Document whose title either is precisely XYZ or contains XYZ in parentheses following text that translates XYZ in another language. (Here XYZ stands for a specific section name mentioned below, such as "Acknowledgements", "Dedications", "Endorsements", or "History".) To "Preserve the Title" of such a section when you modify the Document means that it remains a section "Entitled XYZ" according to this definition. The Document may include Warranty Disclaimers next to the notice which states that this License applies to the Document. These Warranty Disclaimers are considered to be included by reference in this License, but only as regards disclaiming warranties: any other implication that these Warranty Disclaimers may have is void and has no effect on the meaning of this License. 2. VERBATIM COPYING You may copy and distribute the Document in any medium, either commercially or noncommercially, provided that this License, the copyright notices, and the license notice saying this License applies to the Document are reproduced in all copies, and that you add no other conditions whatsoever to those of this License. You may not use technical measures to obstruct or control the reading or further copying of the copies you make or distribute. However, you may accept compensation in exchange for copies. If you distribute a large enough number of copies you must also follow the conditions in section 3. You may also lend copies, under the same conditions stated above, and you may publicly display copies. 3. COPYING IN QUANTITY If you publish printed copies (or copies in media that commonly have printed covers) of the Document, numbering more than 100, and the Document's license notice requires Cover Texts, you must enclose the copies in covers that carry, clearly and legibly, all these Cover Texts: Front-Cover Texts on the front cover, and Back-Cover Texts on the back cover. Both covers must also clearly and legibly identify you as the publisher of these copies. The front cover must present the full title with all words of the title equally prominent and visible. You may add other material on the covers in addition. Copying with changes limited to the covers, as long as they preserve the title of the Document and satisfy these conditions, can be treated as verbatim copying in other respects. If the required texts for either cover are too voluminous to fit legibly, you should put the first ones listed (as many as fit reasonably) on the actual cover, and continue the rest onto adjacent pages. If you publish or distribute Opaque copies of the Document numbering more than 100, you must either include a machine-readable Transparent copy along with each Opaque copy, or state in or with each Opaque copy a computer-network location from which the general network-using public has access to download using public-standard network protocols a complete Transparent copy of the Document, free of added material. If you use the latter option, you must take reasonably prudent steps, when you begin distribution of Opaque copies in quantity, to ensure that this Transparent copy will remain thus accessible at the stated location until at least one year after the last time you distribute an Opaque copy (directly or through your agents or retailers) of that edition to the public. It is requested, but not required, that you contact the authors of the Document well before redistributing any large number of copies, to give them a chance to provide you with an updated version of the Document. 4. MODIFICATIONS You may copy and distribute a Modified Version of the Document under the conditions of sections 2 and 3 above, provided that you release the Modified Version under precisely this License, with the Modified Version filling the role of the Document, thus licensing distribution and modification of the Modified Version to whoever possesses a copy of it. In addition, you must do these things in the Modified Version: A. Use in the Title Page (and on the covers, if any) a title distinct from that of the Document, and from those of previous versions (which should, if there were any, be listed in the History section of the Document). You may use the same title as a previous version if the original publisher of that version gives permission. B. List on the Title Page, as authors, one or more persons or entities responsible for authorship of the modifications in the Modified Version, together with at least five of the principal authors of the Document (all of its principal authors, if it has fewer than five), unless they release you from this requirement. C. State on the Title page the name of the publisher of the Modified Version, as the publisher. D. Preserve all the copyright notices of the Document. E. Add an appropriate copyright notice for your modifications adjacent to the other copyright notices. F. Include, immediately after the copyright notices, a license notice giving the public permission to use the Modified Version under the terms of this License, in the form shown in the Addendum below. G. Preserve in that license notice the full lists of Invariant Sections and required Cover Texts given in the Document's license notice. H. Include an unaltered copy of this License. I. Preserve the section Entitled "History", Preserve its Title, and add to it an item stating at least the title, year, new authors, and publisher of the Modified Version as given on the Title Page. If there is no section Entitled "History" in the Document, create one stating the title, year, authors, and publisher of the Document as given on its Title Page, then add an item describing the Modified Version as stated in the previous sentence. J. Preserve the network location, if any, given in the Document for public access to a Transparent copy of the Document, and likewise the network locations given in the Document for previous versions it was based on. These may be placed in the "History" section. You may omit a network location for a work that was published at least four years before the Document itself, or if the original publisher of the version it refers to gives permission. K. For any section Entitled "Acknowledgements" or "Dedications", Preserve the Title of the section, and preserve in the section all the substance and tone of each of the contributor acknowledgements and/or dedications given therein. L. Preserve all the Invariant Sections of the Document, unaltered in their text and in their titles. Section numbers or the equivalent are not considered part of the section titles. M. Delete any section Entitled "Endorsements". Such a section may not be included in the Modified Version. N. Do not retitle any existing section to be Entitled "Endorsements" or to conflict in title with any Invariant Section. O. Preserve any Warranty Disclaimers. If the Modified Version includes new front-matter sections or appendices that qualify as Secondary Sections and contain no material copied from the Document, you may at your option designate some or all of these sections as invariant. To do this, add their titles to the list of Invariant Sections in the Modified Version's license notice. These titles must be distinct from any other section titles. You may add a section Entitled "Endorsements", provided it contains nothing but endorsements of your Modified Version by various parties--for example, statements of peer review or that the text has been approved by an organization as the authoritative definition of a standard. You may add a passage of up to five words as a Front-Cover Text, and a passage of up to 25 words as a Back-Cover Text, to the end of the list of Cover Texts in the Modified Version. Only one passage of Front-Cover Text and one of Back-Cover Text may be added by (or through arrangements made by) any one entity. If the Document already includes a cover text for the same cover, previously added by you or by arrangement made by the same entity you are acting on behalf of, you may not add another; but you may replace the old one, on explicit permission from the previous publisher that added the old one. The author(s) and publisher(s) of the Document do not by this License give permission to use their names for publicity for or to assert or imply endorsement of any Modified Version. 5. COMBINING DOCUMENTS You may combine the Document with other documents released under this License, under the terms defined in section 4 above for modified versions, provided that you include in the combination all of the Invariant Sections of all of the original documents, unmodified, and list them all as Invariant Sections of your combined work in its license notice, and that you preserve all their Warranty Disclaimers. The combined work need only contain one copy of this License, and multiple identical Invariant Sections may be replaced with a single copy. If there are multiple Invariant Sections with the same name but different contents, make the title of each such section unique by adding at the end of it, in parentheses, the name of the original author or publisher of that section if known, or else a unique number. Make the same adjustment to the section titles in the list of Invariant Sections in the license notice of the combined work. In the combination, you must combine any sections Entitled "History" in the various original documents, forming one section Entitled "History"; likewise combine any sections Entitled "Acknowledgements", and any sections Entitled "Dedications". You must delete all sections Entitled "Endorsements." 6. COLLECTIONS OF DOCUMENTS You may make a collection consisting of the Document and other documents released under this License, and replace the individual copies of this License in the various documents with a single copy that is included in the collection, provided that you follow the rules of this License for verbatim copying of each of the documents in all other respects. You may extract a single document from such a collection, and distribute it individually under this License, provided you insert a copy of this License into the extracted document, and follow this License in all other respects regarding verbatim copying of that document. 7. AGGREGATION WITH INDEPENDENT WORKS A compilation of the Document or its derivatives with other separate and independent documents or works, in or on a volume of a storage or distribution medium, is called an "aggregate" if the copyright resulting from the compilation is not used to limit the legal rights of the compilation's users beyond what the individual works permit. When the Document is included in an aggregate, this License does not apply to the other works in the aggregate which are not themselves derivative works of the Document. If the Cover Text requirement of section 3 is applicable to these copies of the Document, then if the Document is less than one half of the entire aggregate, the Document's Cover Texts may be placed on covers that bracket the Document within the aggregate, or the electronic equivalent of covers if the Document is in electronic form. Otherwise they must appear on printed covers that bracket the whole aggregate. 8. TRANSLATION Translation is considered a kind of modification, so you may distribute translations of the Document under the terms of section 4. Replacing Invariant Sections with translations requires special permission from their copyright holders, but you may include translations of some or all Invariant Sections in addition to the original versions of these Invariant Sections. You may include a translation of this License, and all the license notices in the Document, and any Warranty Disclaimers, provided that you also include the original English version of this License and the original versions of those notices and disclaimers. In case of a disagreement between the translation and the original version of this License or a notice or disclaimer, the original version will prevail. If a section in the Document is Entitled "Acknowledgements", "Dedications", or "History", the requirement (section 4) to Preserve its Title (section 1) will typically require changing the actual title. 9. TERMINATION You may not copy, modify, sublicense, or distribute the Document except as expressly provided under this License. Any attempt otherwise to copy, modify, sublicense, or distribute it is void, and will automatically terminate your rights under this License. However, if you cease all violation of this License, then your license from a particular copyright holder is reinstated (a) provisionally, unless and until the copyright holder explicitly and finally terminates your license, and (b) permanently, if the copyright holder fails to notify you of the violation by some reasonable means prior to 60 days after the cessation. Moreover, your license from a particular copyright holder is reinstated permanently if the copyright holder notifies you of the violation by some reasonable means, this is the first time you have received notice of violation of this License (for any work) from that copyright holder, and you cure the violation prior to 30 days after your receipt of the notice. Termination of your rights under this section does not terminate the licenses of parties who have received copies or rights from you under this License. If your rights have been terminated and not permanently reinstated, receipt of a copy of some or all of the same material does not give you any rights to use it. 10. FUTURE REVISIONS OF THIS LICENSE The Free Software Foundation may publish new, revised versions of the GNU Free Documentation License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns. See `http://www.gnu.org/copyleft/'. Each version of the License is given a distinguishing version number. If the Document specifies that a particular numbered version of this License "or any later version" applies to it, you have the option of following the terms and conditions either of that specified version or of any later version that has been published (not as a draft) by the Free Software Foundation. If the Document does not specify a version number of this License, you may choose any version ever published (not as a draft) by the Free Software Foundation. If the Document specifies that a proxy can decide which future versions of this License can be used, that proxy's public statement of acceptance of a version permanently authorizes you to choose that version for the Document. 11. RELICENSING "Massive Multiauthor Collaboration Site" (or "MMC Site") means any World Wide Web server that publishes copyrightable works and also provides prominent facilities for anybody to edit those works. A public wiki that anybody can edit is an example of such a server. A "Massive Multiauthor Collaboration" (or "MMC") contained in the site means any set of copyrightable works thus published on the MMC site. "CC-BY-SA" means the Creative Commons Attribution-Share Alike 3.0 license published by Creative Commons Corporation, a not-for-profit corporation with a principal place of business in San Francisco, California, as well as future copyleft versions of that license published by that same organization. "Incorporate" means to publish or republish a Document, in whole or in part, as part of another Document. An MMC is "eligible for relicensing" if it is licensed under this License, and if all works that were first published under this License somewhere other than this MMC, and subsequently incorporated in whole or in part into the MMC, (1) had no cover texts or invariant sections, and (2) were thus incorporated prior to November 1, 2008. The operator of an MMC Site may republish an MMC contained in the site under CC-BY-SA on the same site at any time before August 1, 2009, provided the MMC is eligible for relicensing. ADDENDUM: How to use this License for your documents ==================================================== To use this License in a document you have written, include a copy of the License in the document and put the following copyright and license notices just after the title page: Copyright (C) YEAR YOUR NAME. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled ``GNU Free Documentation License''. If you have Invariant Sections, Front-Cover Texts and Back-Cover Texts, replace the "with...Texts." line with this: with the Invariant Sections being LIST THEIR TITLES, with the Front-Cover Texts being LIST, and with the Back-Cover Texts being LIST. If you have Invariant Sections without Cover Texts, or some other combination of the three, merge those two alternatives to suit the situation. If your document contains nontrivial examples of program code, we recommend releasing these examples in parallel under your choice of free software license, such as the GNU General Public License, to permit their use in free software.  File: libgomp.info, Node: Funding, Next: Library Index, Prev: GNU Free Documentation License, Up: Top Funding Free Software ********************* If you want to have more free software a few years from now, it makes sense for you to help encourage people to contribute funds for its development. The most effective approach known is to encourage commercial redistributors to donate. Users of free software systems can boost the pace of development by encouraging for-a-fee distributors to donate part of their selling price to free software developers--the Free Software Foundation, and others. The way to convince distributors to do this is to demand it and expect it from them. So when you compare distributors, judge them partly by how much they give to free software development. Show distributors they must compete to be the one who gives the most. To make this approach work, you must insist on numbers that you can compare, such as, "We will donate ten dollars to the Frobnitz project for each disk sold." Don't be satisfied with a vague promise, such as "A portion of the profits are donated," since it doesn't give a basis for comparison. Even a precise fraction "of the profits from this disk" is not very meaningful, since creative accounting and unrelated business decisions can greatly alter what fraction of the sales price counts as profit. If the price you pay is $50, ten percent of the profit is probably less than a dollar; it might be a few cents, or nothing at all. Some redistributors do development work themselves. This is useful too; but to keep everyone honest, you need to inquire how much they do, and what kind. Some kinds of development make much more long-term difference than others. For example, maintaining a separate version of a program contributes very little; maintaining the standard version of a program for the whole community contributes much. Easy new ports contribute little, since someone else would surely do them; difficult ports such as adding a new CPU to the GNU Compiler Collection contribute more; major new features or packages contribute the most. By establishing the idea that supporting further development is "the proper thing to do" when distributing free software for a fee, we can assure a steady flow of resources into making more free software. Copyright (C) 1994 Free Software Foundation, Inc. Verbatim copying and redistribution of this section is permitted without royalty; alteration is not permitted.  File: libgomp.info, Node: Library Index, Prev: Funding, Up: Top Library Index ************* [index] * Menu: * Environment Variable <1>: GOMP_SPINCOUNT. (line 6) * Environment Variable <2>: GOMP_STACKSIZE. (line 6) * Environment Variable <3>: GOMP_DEBUG. (line 6) * Environment Variable <4>: GOMP_CPU_AFFINITY. (line 6) * Environment Variable <5>: OMP_WAIT_POLICY. (line 6) * Environment Variable <6>: OMP_THREAD_LIMIT. (line 6) * Environment Variable <7>: OMP_SCHEDULE. (line 6) * Environment Variable <8>: OMP_STACKSIZE. (line 6) * Environment Variable <9>: OMP_PLACES. (line 6) * Environment Variable <10>: OMP_PROC_BIND. (line 6) * Environment Variable <11>: OMP_NUM_THREADS. (line 6) * Environment Variable <12>: OMP_NESTED. (line 6) * Environment Variable <13>: OMP_MAX_ACTIVE_LEVELS. (line 6) * Environment Variable <14>: OMP_DYNAMIC. (line 6) * Environment Variable <15>: OMP_DEFAULT_DEVICE. (line 6) * Environment Variable <16>: OMP_DISPLAY_ENV. (line 6) * Environment Variable: OMP_CANCELLATION. (line 6) * FDL, GNU Free Documentation License: GNU Free Documentation License. (line 6) * Implementation specific setting <1>: GOMP_SPINCOUNT. (line 6) * Implementation specific setting <2>: GOMP_STACKSIZE. (line 6) * Implementation specific setting <3>: OMP_SCHEDULE. (line 6) * Implementation specific setting <4>: OMP_NUM_THREADS. (line 6) * Implementation specific setting: OMP_NESTED. (line 6) * Introduction: Top. (line 6)  Tag Table: Node: Top2130 Node: Enabling OpenMP3925 Node: Runtime Library Routines4712 Node: omp_get_active_level7699 Node: omp_get_ancestor_thread_num8397 Node: omp_get_cancellation9324 Node: omp_get_default_device10136 Node: omp_get_dynamic10810 Node: omp_get_level11683 Node: omp_get_max_active_levels12301 Node: omp_get_max_threads12998 Node: omp_get_nested13753 Node: omp_get_num_devices14663 Node: omp_get_num_procs15182 Node: omp_get_num_teams15719 Node: omp_get_num_threads16233 Node: omp_get_proc_bind17320 Node: omp_get_schedule18238 Node: omp_get_team_num19179 Node: omp_get_team_size19676 Node: omp_get_thread_limit20633 Node: omp_get_thread_num21250 Node: omp_in_parallel22119 Node: omp_in_final22766 Node: omp_is_initial_device23438 Node: omp_set_default_device24129 Node: omp_set_dynamic24917 Node: omp_set_max_active_levels25800 Node: omp_set_nested26574 Node: omp_set_num_threads27463 Node: omp_set_schedule28328 Node: omp_init_lock29394 Node: omp_set_lock30044 Node: omp_test_lock30896 Node: omp_unset_lock31869 Node: omp_destroy_lock32797 Node: omp_init_nest_lock33471 Node: omp_set_nest_lock34203 Node: omp_test_nest_lock35120 Node: omp_unset_nest_lock36150 Node: omp_destroy_nest_lock37162 Node: omp_get_wtick37910 Node: omp_get_wtime38500 Node: Environment Variables39274 Node: OMP_CANCELLATION40666 Node: OMP_DISPLAY_ENV41199 Node: OMP_DEFAULT_DEVICE41902 Node: OMP_DYNAMIC42682 Node: OMP_MAX_ACTIVE_LEVELS43278 Node: OMP_NESTED43917 Node: OMP_NUM_THREADS44522 Node: OMP_PROC_BIND45211 Node: OMP_PLACES46403 Node: OMP_STACKSIZE48578 Node: OMP_SCHEDULE49402 Node: OMP_THREAD_LIMIT50098 Node: OMP_WAIT_POLICY50698 Node: GOMP_CPU_AFFINITY51390 Node: GOMP_DEBUG53121 Node: GOMP_STACKSIZE53628 Node: GOMP_SPINCOUNT54457 Node: The libgomp ABI55634 Node: Implementing MASTER construct56433 Node: Implementing CRITICAL construct56847 Node: Implementing ATOMIC construct57586 Node: Implementing FLUSH construct58067 Node: Implementing BARRIER construct58338 Node: Implementing THREADPRIVATE construct58607 Node: Implementing PRIVATE clause59259 Node: Implementing FIRSTPRIVATE LASTPRIVATE COPYIN and COPYPRIVATE clauses59840 Node: Implementing REDUCTION clause61164 Node: Implementing PARALLEL construct61721 Node: Implementing FOR construct62978 Node: Implementing ORDERED construct64976 Node: Implementing SECTIONS construct65282 Node: Implementing SINGLE construct66048 Node: Reporting Bugs66710 Node: Copying67070 Node: GNU Free Documentation License104635 Node: Funding129777 Node: Library Index132302  End Tag Table