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147 lines
4.9 KiB
C++
147 lines
4.9 KiB
C++
/* os_mutex.h -*-C++-*-
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*
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*************************************************************************
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*
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* Copyright (C) 2009-2016, Intel Corporation
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
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* WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* *********************************************************************
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*
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* PLEASE NOTE: This file is a downstream copy of a file mainitained in
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* a repository at cilkplus.org. Changes made to this file that are not
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* submitted through the contribution process detailed at
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* http://www.cilkplus.org/submit-cilk-contribution will be lost the next
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* time that a new version is released. Changes only submitted to the
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* GNU compiler collection or posted to the git repository at
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* https://bitbucket.org/intelcilkruntime/intel-cilk-runtime.git are
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* not tracked.
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*
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* We welcome your contributions to this open source project. Thank you
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* for your assistance in helping us improve Cilk Plus.
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**************************************************************************/
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/**
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* @file os_mutex.h
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*
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* @brief Portable interface to operating-system mutexes.
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*
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* Do not confuse os_mutex with Cilk runtime-specific spinlock mutexes.
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*/
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#ifndef INCLUDED_OS_MUTEX_DOT_H
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#define INCLUDED_OS_MUTEX_DOT_H
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#include <cilk/common.h>
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#include "rts-common.h"
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__CILKRTS_BEGIN_EXTERN_C
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/// Opaque type
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typedef struct os_mutex os_mutex;
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/**
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* Allocate and initialize an os_mutex
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*
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* @return A pointer to the initialized os_mutex
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*/
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COMMON_SYSDEP os_mutex* __cilkrts_os_mutex_create(void);
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/**
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* Acquire the os_mutex for exclusive use
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*
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* @param m The os_mutex that is to be acquired.
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*/
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COMMON_SYSDEP void __cilkrts_os_mutex_lock(os_mutex *m);
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/**
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* Try to acquire the os_mutex.
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*
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* @param m The os_mutex to try to acquire
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* @return 0 if the lock acquire failed
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* @return nonzero if the lock was acquired
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*/
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COMMON_SYSDEP int __cilkrts_os_mutex_trylock(os_mutex *m);
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/**
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* Release the os_mutex
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*
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* @param m The os_mutex that is to be released.
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*/
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COMMON_SYSDEP void __cilkrts_os_mutex_unlock(os_mutex *m);
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/**
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* Release any resources and deallocate the os_mutex.
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*
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* @param m The os_mutex that is to be deallocated.
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*/
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COMMON_SYSDEP void __cilkrts_os_mutex_destroy(os_mutex *m);
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/**
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* Acquire the global os_mutex for exclusive use. The global os_mutex
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* will be initialized the first time this function is called in a
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* thread-safe manner.
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*/
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COMMON_SYSDEP void global_os_mutex_lock();
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/**
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* Release the global os_mutex. global_os_mutex_lock() must have been
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* called first.
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*/
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COMMON_SYSDEP void global_os_mutex_unlock();
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#ifdef _MSC_VER
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/**
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* @brief Create the global OS mutex - Windows only.
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*
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* On Windows we use DllMain() to create the global OS mutex when cilkrts20.dll
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* is loaded. As opposed to Linux/MacOS where we use pthread_once to implement
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* a singleton since there are no guarantees about constructor or destructor
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* ordering between shared objects.
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*/
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NON_COMMON void global_os_mutex_create();
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/**
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* @brief Destroy the global OS mutex - Windows only
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*
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* On Windows we use DllMain() to destroy the global OS mutex when
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* cilkrts20.dll is unloaded. As opposed to Linux/MacOS where we cannot
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* know when it's safe to destroy the global OS mutex since there are no
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* guarantees about constructor or destructor ordering.
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*/
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NON_COMMON void global_os_mutex_destroy();
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#endif // _MSC_VER
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__CILKRTS_END_EXTERN_C
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#endif // ! defined(INCLUDED_OS_MUTEX_DOT_H)
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