mirror of
https://github.com/autc04/Retro68.git
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787 lines
19 KiB
C
787 lines
19 KiB
C
/* Threads compatibility routines for libgcc2 and libobjc. */
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/* Compile this one with gcc. */
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/* Copyright (C) 1999-2016 Free Software Foundation, Inc.
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Contributed by Mumit Khan <khan@xraylith.wisc.edu>.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef GCC_GTHR_WIN32_H
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#define GCC_GTHR_WIN32_H
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/* Make sure CONST_CAST2 (origin in system.h) is declared. */
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#ifndef CONST_CAST2
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#define CONST_CAST2(TOTYPE,FROMTYPE,X) ((__extension__(union {FROMTYPE _q; TOTYPE _nq;})(X))._nq)
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#endif
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/* Windows32 threads specific definitions. The windows32 threading model
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does not map well into pthread-inspired gcc's threading model, and so
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there are caveats one needs to be aware of.
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1. The destructor supplied to __gthread_key_create is ignored for
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generic x86-win32 ports. This will certainly cause memory leaks
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due to unreclaimed eh contexts (sizeof (eh_context) is at least
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24 bytes for x86 currently).
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This memory leak may be significant for long-running applications
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that make heavy use of C++ EH.
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However, Mingw runtime (version 0.3 or newer) provides a mechanism
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to emulate pthreads key dtors; the runtime provides a special DLL,
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linked in if -mthreads option is specified, that runs the dtors in
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the reverse order of registration when each thread exits. If
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-mthreads option is not given, a stub is linked in instead of the
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DLL, which results in memory leak. Other x86-win32 ports can use
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the same technique of course to avoid the leak.
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2. The error codes returned are non-POSIX like, and cast into ints.
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This may cause incorrect error return due to truncation values on
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hw where sizeof (DWORD) > sizeof (int).
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3. We are currently using a special mutex instead of the Critical
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Sections, since Win9x does not support TryEnterCriticalSection
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(while NT does).
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The basic framework should work well enough. In the long term, GCC
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needs to use Structured Exception Handling on Windows32. */
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#define __GTHREADS 1
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#include <errno.h>
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#ifdef __MINGW32__
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#include <_mingw.h>
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#endif
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#ifndef __UNUSED_PARAM
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#define __UNUSED_PARAM(x) x
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#endif
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#ifdef _LIBOBJC
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/* This is necessary to prevent windef.h (included from windows.h) from
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defining its own BOOL as a typedef. */
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#ifndef __OBJC__
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#define __OBJC__
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#endif
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#include <windows.h>
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/* Now undef the windows BOOL. */
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#undef BOOL
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/* Key structure for maintaining thread specific storage */
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static DWORD __gthread_objc_data_tls = (DWORD) -1;
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/* Backend initialization functions */
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/* Initialize the threads subsystem. */
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int
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__gthread_objc_init_thread_system (void)
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{
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/* Initialize the thread storage key. */
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if ((__gthread_objc_data_tls = TlsAlloc ()) != (DWORD) -1)
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return 0;
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else
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return -1;
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}
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/* Close the threads subsystem. */
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int
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__gthread_objc_close_thread_system (void)
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{
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if (__gthread_objc_data_tls != (DWORD) -1)
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TlsFree (__gthread_objc_data_tls);
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return 0;
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}
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/* Backend thread functions */
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/* Create a new thread of execution. */
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objc_thread_t
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__gthread_objc_thread_detach (void (*func)(void *arg), void *arg)
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{
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DWORD thread_id = 0;
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HANDLE win32_handle;
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if (!(win32_handle = CreateThread (NULL, 0, (LPTHREAD_START_ROUTINE) func,
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arg, 0, &thread_id)))
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thread_id = 0;
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return (objc_thread_t) (INT_PTR) thread_id;
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}
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/* Set the current thread's priority. */
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int
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__gthread_objc_thread_set_priority (int priority)
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{
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int sys_priority = 0;
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switch (priority)
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{
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case OBJC_THREAD_INTERACTIVE_PRIORITY:
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sys_priority = THREAD_PRIORITY_NORMAL;
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break;
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default:
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case OBJC_THREAD_BACKGROUND_PRIORITY:
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sys_priority = THREAD_PRIORITY_BELOW_NORMAL;
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break;
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case OBJC_THREAD_LOW_PRIORITY:
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sys_priority = THREAD_PRIORITY_LOWEST;
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break;
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}
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/* Change priority */
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if (SetThreadPriority (GetCurrentThread (), sys_priority))
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return 0;
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else
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return -1;
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}
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/* Return the current thread's priority. */
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int
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__gthread_objc_thread_get_priority (void)
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{
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int sys_priority;
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sys_priority = GetThreadPriority (GetCurrentThread ());
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switch (sys_priority)
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{
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case THREAD_PRIORITY_HIGHEST:
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case THREAD_PRIORITY_TIME_CRITICAL:
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case THREAD_PRIORITY_ABOVE_NORMAL:
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case THREAD_PRIORITY_NORMAL:
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return OBJC_THREAD_INTERACTIVE_PRIORITY;
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default:
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case THREAD_PRIORITY_BELOW_NORMAL:
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return OBJC_THREAD_BACKGROUND_PRIORITY;
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case THREAD_PRIORITY_IDLE:
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case THREAD_PRIORITY_LOWEST:
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return OBJC_THREAD_LOW_PRIORITY;
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}
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/* Couldn't get priority. */
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return -1;
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}
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/* Yield our process time to another thread. */
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void
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__gthread_objc_thread_yield (void)
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{
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Sleep (0);
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}
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/* Terminate the current thread. */
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int
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__gthread_objc_thread_exit (void)
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{
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/* exit the thread */
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ExitThread (__objc_thread_exit_status);
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/* Failed if we reached here */
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return -1;
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}
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/* Returns an integer value which uniquely describes a thread. */
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objc_thread_t
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__gthread_objc_thread_id (void)
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{
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return (objc_thread_t) (INT_PTR) GetCurrentThreadId ();
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}
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/* Sets the thread's local storage pointer. */
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int
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__gthread_objc_thread_set_data (void *value)
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{
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if (TlsSetValue (__gthread_objc_data_tls, value))
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return 0;
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else
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return -1;
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}
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/* Returns the thread's local storage pointer. */
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void *
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__gthread_objc_thread_get_data (void)
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{
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DWORD lasterror;
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void *ptr;
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lasterror = GetLastError ();
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ptr = TlsGetValue (__gthread_objc_data_tls); /* Return thread data. */
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SetLastError (lasterror);
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return ptr;
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}
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/* Backend mutex functions */
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/* Allocate a mutex. */
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int
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__gthread_objc_mutex_allocate (objc_mutex_t mutex)
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{
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if ((mutex->backend = (void *) CreateMutex (NULL, 0, NULL)) == NULL)
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return -1;
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else
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return 0;
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}
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/* Deallocate a mutex. */
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int
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__gthread_objc_mutex_deallocate (objc_mutex_t mutex)
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{
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CloseHandle ((HANDLE) (mutex->backend));
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return 0;
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}
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/* Grab a lock on a mutex. */
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int
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__gthread_objc_mutex_lock (objc_mutex_t mutex)
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{
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int status;
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status = WaitForSingleObject ((HANDLE) (mutex->backend), INFINITE);
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if (status != WAIT_OBJECT_0 && status != WAIT_ABANDONED)
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return -1;
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else
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return 0;
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}
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/* Try to grab a lock on a mutex. */
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int
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__gthread_objc_mutex_trylock (objc_mutex_t mutex)
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{
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int status;
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status = WaitForSingleObject ((HANDLE) (mutex->backend), 0);
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if (status != WAIT_OBJECT_0 && status != WAIT_ABANDONED)
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return -1;
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else
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return 0;
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}
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/* Unlock the mutex */
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int
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__gthread_objc_mutex_unlock (objc_mutex_t mutex)
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{
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if (ReleaseMutex ((HANDLE) (mutex->backend)) == 0)
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return -1;
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else
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return 0;
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}
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/* Backend condition mutex functions */
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/* Allocate a condition. */
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int
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__gthread_objc_condition_allocate (objc_condition_t __UNUSED_PARAM(condition))
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{
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/* Unimplemented. */
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return -1;
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}
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/* Deallocate a condition. */
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int
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__gthread_objc_condition_deallocate (objc_condition_t __UNUSED_PARAM(condition))
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{
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/* Unimplemented. */
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return -1;
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}
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/* Wait on the condition */
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int
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__gthread_objc_condition_wait (objc_condition_t __UNUSED_PARAM(condition),
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objc_mutex_t __UNUSED_PARAM(mutex))
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{
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/* Unimplemented. */
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return -1;
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}
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/* Wake up all threads waiting on this condition. */
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int
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__gthread_objc_condition_broadcast (objc_condition_t __UNUSED_PARAM(condition))
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{
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/* Unimplemented. */
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return -1;
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}
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/* Wake up one thread waiting on this condition. */
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int
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__gthread_objc_condition_signal (objc_condition_t __UNUSED_PARAM(condition))
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{
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/* Unimplemented. */
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return -1;
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}
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#else /* _LIBOBJC */
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef unsigned long __gthread_key_t;
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typedef struct {
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int done;
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long started;
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} __gthread_once_t;
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typedef struct {
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long counter;
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void *sema;
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} __gthread_mutex_t;
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typedef struct {
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long counter;
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long depth;
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unsigned long owner;
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void *sema;
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} __gthread_recursive_mutex_t;
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#define __GTHREAD_ONCE_INIT {0, -1}
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#define __GTHREAD_MUTEX_INIT_FUNCTION __gthread_mutex_init_function
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#define __GTHREAD_MUTEX_INIT_DEFAULT {-1, 0}
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#define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION \
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__gthread_recursive_mutex_init_function
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#define __GTHREAD_RECURSIVE_MUTEX_INIT_DEFAULT {-1, 0, 0, 0}
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#if defined (_WIN32) && !defined(__CYGWIN__)
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#define MINGW32_SUPPORTS_MT_EH 1
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/* Mingw runtime >= v0.3 provides a magic variable that is set to nonzero
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if -mthreads option was specified, or 0 otherwise. This is to get around
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the lack of weak symbols in PE-COFF. */
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extern int _CRT_MT;
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extern int __mingwthr_key_dtor (unsigned long, void (*) (void *));
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#endif /* _WIN32 && !__CYGWIN__ */
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/* The Windows95 kernel does not export InterlockedCompareExchange.
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This provides a substitute. When building apps that reference
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gthread_mutex_try_lock, the __GTHREAD_I486_INLINE_LOCK_PRIMITIVES
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macro must be defined if Windows95 is a target. Currently
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gthread_mutex_try_lock is not referenced by libgcc or libstdc++. */
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#ifdef __GTHREAD_I486_INLINE_LOCK_PRIMITIVES
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static inline long
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__gthr_i486_lock_cmp_xchg(long *__dest, long __xchg, long __comperand)
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{
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long result;
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__asm__ __volatile__ ("\n\
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lock\n\
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cmpxchg{l} {%4, %1|%1, %4}\n"
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: "=a" (result), "=m" (*__dest)
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: "0" (__comperand), "m" (*__dest), "r" (__xchg)
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: "cc");
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return result;
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}
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#define __GTHR_W32_InterlockedCompareExchange __gthr_i486_lock_cmp_xchg
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#else /* __GTHREAD_I486_INLINE_LOCK_PRIMITIVES */
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#define __GTHR_W32_InterlockedCompareExchange InterlockedCompareExchange
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#endif /* __GTHREAD_I486_INLINE_LOCK_PRIMITIVES */
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static inline int
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__gthread_active_p (void)
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{
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#ifdef MINGW32_SUPPORTS_MT_EH
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return _CRT_MT;
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#else
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return 1;
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#endif
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}
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#if __GTHREAD_HIDE_WIN32API
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/* The implementations are in config/i386/gthr-win32.c in libgcc.a.
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Only stubs are exposed to avoid polluting the C++ namespace with
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windows api definitions. */
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extern int __gthr_win32_once (__gthread_once_t *, void (*) (void));
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extern int __gthr_win32_key_create (__gthread_key_t *, void (*) (void*));
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extern int __gthr_win32_key_delete (__gthread_key_t);
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extern void * __gthr_win32_getspecific (__gthread_key_t);
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extern int __gthr_win32_setspecific (__gthread_key_t, const void *);
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extern void __gthr_win32_mutex_init_function (__gthread_mutex_t *);
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extern int __gthr_win32_mutex_lock (__gthread_mutex_t *);
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extern int __gthr_win32_mutex_trylock (__gthread_mutex_t *);
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extern int __gthr_win32_mutex_unlock (__gthread_mutex_t *);
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extern void
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__gthr_win32_recursive_mutex_init_function (__gthread_recursive_mutex_t *);
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extern int __gthr_win32_recursive_mutex_lock (__gthread_recursive_mutex_t *);
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extern int
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__gthr_win32_recursive_mutex_trylock (__gthread_recursive_mutex_t *);
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extern int __gthr_win32_recursive_mutex_unlock (__gthread_recursive_mutex_t *);
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extern void __gthr_win32_mutex_destroy (__gthread_mutex_t *);
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extern int
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__gthr_win32_recursive_mutex_destroy (__gthread_recursive_mutex_t *);
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static inline int
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__gthread_once (__gthread_once_t *__once, void (*__func) (void))
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{
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if (__gthread_active_p ())
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return __gthr_win32_once (__once, __func);
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else
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return -1;
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}
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static inline int
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__gthread_key_create (__gthread_key_t *__key, void (*__dtor) (void *))
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{
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return __gthr_win32_key_create (__key, __dtor);
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}
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static inline int
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__gthread_key_delete (__gthread_key_t __key)
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{
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return __gthr_win32_key_delete (__key);
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}
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static inline void *
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__gthread_getspecific (__gthread_key_t __key)
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{
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return __gthr_win32_getspecific (__key);
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}
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static inline int
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__gthread_setspecific (__gthread_key_t __key, const void *__ptr)
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{
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return __gthr_win32_setspecific (__key, __ptr);
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}
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static inline void
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__gthread_mutex_init_function (__gthread_mutex_t *__mutex)
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{
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__gthr_win32_mutex_init_function (__mutex);
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}
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static inline void
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__gthread_mutex_destroy (__gthread_mutex_t *__mutex)
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{
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__gthr_win32_mutex_destroy (__mutex);
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}
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static inline int
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__gthread_mutex_lock (__gthread_mutex_t *__mutex)
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{
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if (__gthread_active_p ())
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return __gthr_win32_mutex_lock (__mutex);
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else
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return 0;
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}
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static inline int
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__gthread_mutex_trylock (__gthread_mutex_t *__mutex)
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|
{
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if (__gthread_active_p ())
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return __gthr_win32_mutex_trylock (__mutex);
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else
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return 0;
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}
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static inline int
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__gthread_mutex_unlock (__gthread_mutex_t *__mutex)
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{
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if (__gthread_active_p ())
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return __gthr_win32_mutex_unlock (__mutex);
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else
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return 0;
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}
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static inline void
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__gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *__mutex)
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{
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__gthr_win32_recursive_mutex_init_function (__mutex);
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}
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static inline int
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__gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *__mutex)
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{
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if (__gthread_active_p ())
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return __gthr_win32_recursive_mutex_lock (__mutex);
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else
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return 0;
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}
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static inline int
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__gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *__mutex)
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|
{
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if (__gthread_active_p ())
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return __gthr_win32_recursive_mutex_trylock (__mutex);
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else
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|
return 0;
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|
}
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|
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static inline int
|
|
__gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *__mutex)
|
|
{
|
|
if (__gthread_active_p ())
|
|
return __gthr_win32_recursive_mutex_unlock (__mutex);
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static inline int
|
|
__gthread_recursive_mutex_destroy (__gthread_recursive_mutex_t *__mutex)
|
|
{
|
|
return __gthr_win32_recursive_mutex_destroy (__mutex);
|
|
}
|
|
|
|
#else /* ! __GTHREAD_HIDE_WIN32API */
|
|
|
|
#include <windows.h>
|
|
#include <errno.h>
|
|
|
|
static inline int
|
|
__gthread_once (__gthread_once_t *__once, void (*__func) (void))
|
|
{
|
|
if (! __gthread_active_p ())
|
|
return -1;
|
|
else if (__once == NULL || __func == NULL)
|
|
return EINVAL;
|
|
|
|
if (! __once->done)
|
|
{
|
|
if (InterlockedIncrement (&(__once->started)) == 0)
|
|
{
|
|
(*__func) ();
|
|
__once->done = TRUE;
|
|
}
|
|
else
|
|
{
|
|
/* Another thread is currently executing the code, so wait for it
|
|
to finish; yield the CPU in the meantime. If performance
|
|
does become an issue, the solution is to use an Event that
|
|
we wait on here (and set above), but that implies a place to
|
|
create the event before this routine is called. */
|
|
while (! __once->done)
|
|
Sleep (0);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Windows32 thread local keys don't support destructors; this leads to
|
|
leaks, especially in threaded applications making extensive use of
|
|
C++ EH. Mingw uses a thread-support DLL to work-around this problem. */
|
|
static inline int
|
|
__gthread_key_create (__gthread_key_t *__key,
|
|
void (*__dtor) (void *) __attribute__((__unused__)))
|
|
{
|
|
int __status = 0;
|
|
DWORD __tls_index = TlsAlloc ();
|
|
if (__tls_index != 0xFFFFFFFF)
|
|
{
|
|
*__key = __tls_index;
|
|
#ifdef MINGW32_SUPPORTS_MT_EH
|
|
/* Mingw runtime will run the dtors in reverse order for each thread
|
|
when the thread exits. */
|
|
__status = __mingwthr_key_dtor (*__key, __dtor);
|
|
#endif
|
|
}
|
|
else
|
|
__status = (int) GetLastError ();
|
|
return __status;
|
|
}
|
|
|
|
static inline int
|
|
__gthread_key_delete (__gthread_key_t __key)
|
|
{
|
|
return (TlsFree (__key) != 0) ? 0 : (int) GetLastError ();
|
|
}
|
|
|
|
static inline void *
|
|
__gthread_getspecific (__gthread_key_t __key)
|
|
{
|
|
DWORD __lasterror;
|
|
void *__ptr;
|
|
|
|
__lasterror = GetLastError ();
|
|
|
|
__ptr = TlsGetValue (__key);
|
|
|
|
SetLastError (__lasterror);
|
|
|
|
return __ptr;
|
|
}
|
|
|
|
static inline int
|
|
__gthread_setspecific (__gthread_key_t __key, const void *__ptr)
|
|
{
|
|
if (TlsSetValue (__key, CONST_CAST2(void *, const void *, __ptr)) != 0)
|
|
return 0;
|
|
else
|
|
return GetLastError ();
|
|
}
|
|
|
|
static inline void
|
|
__gthread_mutex_init_function (__gthread_mutex_t *__mutex)
|
|
{
|
|
__mutex->counter = -1;
|
|
__mutex->sema = CreateSemaphoreW (NULL, 0, 65535, NULL);
|
|
}
|
|
|
|
static inline void
|
|
__gthread_mutex_destroy (__gthread_mutex_t *__mutex)
|
|
{
|
|
CloseHandle ((HANDLE) __mutex->sema);
|
|
}
|
|
|
|
static inline int
|
|
__gthread_mutex_lock (__gthread_mutex_t *__mutex)
|
|
{
|
|
int __status = 0;
|
|
|
|
if (__gthread_active_p ())
|
|
{
|
|
if (InterlockedIncrement (&__mutex->counter) == 0 ||
|
|
WaitForSingleObject (__mutex->sema, INFINITE) == WAIT_OBJECT_0)
|
|
__status = 0;
|
|
else
|
|
{
|
|
/* WaitForSingleObject returns WAIT_FAILED, and we can only do
|
|
some best-effort cleanup here. */
|
|
InterlockedDecrement (&__mutex->counter);
|
|
__status = 1;
|
|
}
|
|
}
|
|
return __status;
|
|
}
|
|
|
|
static inline int
|
|
__gthread_mutex_trylock (__gthread_mutex_t *__mutex)
|
|
{
|
|
int __status = 0;
|
|
|
|
if (__gthread_active_p ())
|
|
{
|
|
if (__GTHR_W32_InterlockedCompareExchange (&__mutex->counter, 0, -1) < 0)
|
|
__status = 0;
|
|
else
|
|
__status = 1;
|
|
}
|
|
return __status;
|
|
}
|
|
|
|
static inline int
|
|
__gthread_mutex_unlock (__gthread_mutex_t *__mutex)
|
|
{
|
|
if (__gthread_active_p ())
|
|
{
|
|
if (InterlockedDecrement (&__mutex->counter) >= 0)
|
|
return ReleaseSemaphore (__mutex->sema, 1, NULL) ? 0 : 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static inline void
|
|
__gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *__mutex)
|
|
{
|
|
__mutex->counter = -1;
|
|
__mutex->depth = 0;
|
|
__mutex->owner = 0;
|
|
__mutex->sema = CreateSemaphoreW (NULL, 0, 65535, NULL);
|
|
}
|
|
|
|
static inline int
|
|
__gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *__mutex)
|
|
{
|
|
if (__gthread_active_p ())
|
|
{
|
|
DWORD __me = GetCurrentThreadId();
|
|
if (InterlockedIncrement (&__mutex->counter) == 0)
|
|
{
|
|
__mutex->depth = 1;
|
|
__mutex->owner = __me;
|
|
}
|
|
else if (__mutex->owner == __me)
|
|
{
|
|
InterlockedDecrement (&__mutex->counter);
|
|
++(__mutex->depth);
|
|
}
|
|
else if (WaitForSingleObject (__mutex->sema, INFINITE) == WAIT_OBJECT_0)
|
|
{
|
|
__mutex->depth = 1;
|
|
__mutex->owner = __me;
|
|
}
|
|
else
|
|
{
|
|
/* WaitForSingleObject returns WAIT_FAILED, and we can only do
|
|
some best-effort cleanup here. */
|
|
InterlockedDecrement (&__mutex->counter);
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static inline int
|
|
__gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *__mutex)
|
|
{
|
|
if (__gthread_active_p ())
|
|
{
|
|
DWORD __me = GetCurrentThreadId();
|
|
if (__GTHR_W32_InterlockedCompareExchange (&__mutex->counter, 0, -1) < 0)
|
|
{
|
|
__mutex->depth = 1;
|
|
__mutex->owner = __me;
|
|
}
|
|
else if (__mutex->owner == __me)
|
|
++(__mutex->depth);
|
|
else
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static inline int
|
|
__gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *__mutex)
|
|
{
|
|
if (__gthread_active_p ())
|
|
{
|
|
--(__mutex->depth);
|
|
if (__mutex->depth == 0)
|
|
{
|
|
__mutex->owner = 0;
|
|
|
|
if (InterlockedDecrement (&__mutex->counter) >= 0)
|
|
return ReleaseSemaphore (__mutex->sema, 1, NULL) ? 0 : 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static inline int
|
|
__gthread_recursive_mutex_destroy (__gthread_recursive_mutex_t *__mutex)
|
|
{
|
|
CloseHandle ((HANDLE) __mutex->sema);
|
|
return 0;
|
|
}
|
|
|
|
#endif /* __GTHREAD_HIDE_WIN32API */
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* _LIBOBJC */
|
|
|
|
#endif /* ! GCC_GTHR_WIN32_H */
|