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