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IABSD.fr/xenocara/xserver/glx/glthread.h
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/* * Mesa 3-D graphics library * Version: 6.5.2 * * Copyright (C) 1999-2006 Brian Paul All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included * in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ /* * Thread support for gl dispatch. * * Initial version by John Stone (j.stone@acm.org) (johns@cs.umr.edu) * and Christoph Poliwoda (poliwoda@volumegraphics.com) * Revised by Keith Whitwell * Adapted for new gl dispatcher by Brian Paul * * * * DOCUMENTATION * * This thread module exports the following types: * _glthread_TSD Thread-specific data area * _glthread_Thread Thread datatype * _glthread_Mutex Mutual exclusion lock * * Macros: * _glthread_DECLARE_STATIC_MUTEX(name) Declare a non-local mutex * _glthread_INIT_MUTEX(name) Initialize a mutex * _glthread_LOCK_MUTEX(name) Lock a mutex * _glthread_UNLOCK_MUTEX(name) Unlock a mutex * * Functions: * _glthread_GetID(v) Get integer thread ID * _glthread_InitTSD() Initialize thread-specific data * _glthread_GetTSD() Get thread-specific data * _glthread_SetTSD() Set thread-specific data * */ /* * If this file is accidentally included by a non-threaded build, * it should not cause the build to fail, or otherwise cause problems. * In general, it should only be included when needed however. */ #ifndef GLTHREAD_H #define GLTHREAD_H #if defined(USE_MGL_NAMESPACE) #define _glapi_Dispatch _mglapi_Dispatch #endif #if (defined(PTHREADS) || defined(WIN32_THREADS)) \ && !defined(THREADS) #define THREADS #endif #ifdef VMS #include <GL/vms_x_fix.h> #endif /* * POSIX threads. This should be your choice in the Unix world * whenever possible. When building with POSIX threads, be sure * to enable any compiler flags which will cause the MT-safe * libc (if one exists) to be used when linking, as well as any * header macros for MT-safe errno, etc. For Solaris, this is the -mt * compiler flag. On Solaris with gcc, use -D_REENTRANT to enable * proper compiling for MT-safe libc etc. */ #if defined(PTHREADS) #include <pthread.h> /* POSIX threads headers */ typedef struct { pthread_key_t key; int initMagic; } _glthread_TSD; typedef pthread_t _glthread_Thread; typedef pthread_mutex_t _glthread_Mutex; #define _glthread_DECLARE_STATIC_MUTEX(name) \ static _glthread_Mutex name = PTHREAD_MUTEX_INITIALIZER #define _glthread_INIT_MUTEX(name) \ pthread_mutex_init(&(name), NULL) #define _glthread_DESTROY_MUTEX(name) \ pthread_mutex_destroy(&(name)) #define _glthread_LOCK_MUTEX(name) \ (void) pthread_mutex_lock(&(name)) #define _glthread_UNLOCK_MUTEX(name) \ (void) pthread_mutex_unlock(&(name)) #endif /* PTHREADS */ /* * Solaris threads. Use only up to Solaris 2.4. * Solaris 2.5 and higher provide POSIX threads. * Be sure to compile with -mt on the Solaris compilers, or * use -D_REENTRANT if using gcc. */ /* * Windows threads. Should work with Windows NT and 95. * IMPORTANT: Link with multithreaded runtime library when THREADS are * used! */ #ifdef WIN32_THREADS #include <windows.h> typedef struct { DWORD key; int initMagic; } _glthread_TSD; typedef HANDLE _glthread_Thread; typedef CRITICAL_SECTION _glthread_Mutex; #define _glthread_DECLARE_STATIC_MUTEX(name) /*static*/ _glthread_Mutex name = {0,0,0,0,0,0} #define _glthread_INIT_MUTEX(name) InitializeCriticalSection(&name) #define _glthread_DESTROY_MUTEX(name) DeleteCriticalSection(&name) #define _glthread_LOCK_MUTEX(name) EnterCriticalSection(&name) #define _glthread_UNLOCK_MUTEX(name) LeaveCriticalSection(&name) #endif /* WIN32_THREADS */ /* * BeOS threads. R5.x required. */ #ifdef BEOS_THREADS #include <kernel/OS.h> #include <support/TLS.h> typedef struct { int32 key; int initMagic; } _glthread_TSD; typedef thread_id _glthread_Thread; /* Use Benaphore, aka speeder semaphore */ typedef struct { int32 lock; sem_id sem; } benaphore; typedef benaphore _glthread_Mutex; #define _glthread_DECLARE_STATIC_MUTEX(name) static _glthread_Mutex name = { 0, 0 } #define _glthread_INIT_MUTEX(name) name.sem = create_sem(0, #name"_benaphore"), name.lock = 0 #define _glthread_DESTROY_MUTEX(name) delete_sem(name.sem), name.lock = 0 #define _glthread_LOCK_MUTEX(name) if (name.sem == 0) _glthread_INIT_MUTEX(name); \ if (atomic_add(&(name.lock), 1) >= 1) acquire_sem(name.sem) #define _glthread_UNLOCK_MUTEX(name) if (atomic_add(&(name.lock), -1) > 1) release_sem(name.sem) #endif /* BEOS_THREADS */ #ifndef THREADS /* * THREADS not defined */ typedef int _glthread_TSD; typedef int _glthread_Thread; typedef int _glthread_Mutex; #define _glthread_DECLARE_STATIC_MUTEX(name) static _glthread_Mutex name = 0 #define _glthread_INIT_MUTEX(name) (void) name #define _glthread_DESTROY_MUTEX(name) (void) name #define _glthread_LOCK_MUTEX(name) (void) name #define _glthread_UNLOCK_MUTEX(name) (void) name #endif /* THREADS */ /* * Platform independent thread specific data API. */ extern unsigned long _glthread_GetID(void); extern void _glthread_InitTSD(_glthread_TSD *); extern void *_glthread_GetTSD(_glthread_TSD *); extern void _glthread_SetTSD(_glthread_TSD *, void *); #if defined(GLX_USE_TLS) extern TLS struct _glapi_table *_glapi_tls_Dispatch; #define GET_DISPATCH() _glapi_tls_Dispatch #elif !defined(GL_CALL) #if defined(THREADS) #define GET_DISPATCH() \ ((__builtin_expect( _glapi_Dispatch != NULL, 1 )) \ ? _glapi_Dispatch : _glapi_get_dispatch()) #else #define GET_DISPATCH() _glapi_Dispatch #endif /* defined(THREADS) */ #endif /* ndef GL_CALL */ #endif /* THREADS_H */