2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2003 Brian Paul All Rights Reserved.
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
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11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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27 * Thread support for gl dispatch.
29 * Initial version by John Stone (j.stone@acm.org) (johns@cs.umr.edu)
30 * and Christoph Poliwoda (poliwoda@volumegraphics.com)
31 * Revised by Keith Whitwell
32 * Adapted for new gl dispatcher by Brian Paul
38 * This thread module exports the following types:
39 * _glthread_TSD Thread-specific data area
40 * _glthread_Thread Thread datatype
41 * _glthread_Mutex Mutual exclusion lock
44 * _glthread_DECLARE_STATIC_MUTEX(name) Declare a non-local mutex
45 * _glthread_INIT_MUTEX(name) Initialize a mutex
46 * _glthread_LOCK_MUTEX(name) Lock a mutex
47 * _glthread_UNLOCK_MUTEX(name) Unlock a mutex
50 * _glthread_GetID(v) Get integer thread ID
51 * _glthread_InitTSD() Initialize thread-specific data
52 * _glthread_GetTSD() Get thread-specific data
53 * _glthread_SetTSD() Set thread-specific data
58 * If this file is accidentally included by a non-threaded build,
59 * it should not cause the build to fail, or otherwise cause problems.
60 * In general, it should only be included when needed however.
67 #if defined(PTHREADS) || defined(SOLARIS_THREADS) || defined(WIN32_THREADS) || \
68 defined(XTHREADS) || defined(BEOS_THREADS)
73 #include <GL/vms_x_fix.h>
77 * POSIX threads. This should be your choice in the Unix world
78 * whenever possible. When building with POSIX threads, be sure
79 * to enable any compiler flags which will cause the MT-safe
80 * libc (if one exists) to be used when linking, as well as any
81 * header macros for MT-safe errno, etc. For Solaris, this is the -mt
82 * compiler flag. On Solaris with gcc, use -D_REENTRANT to enable
83 * proper compiling for MT-safe libc etc.
86 #include <pthread.h> /* POSIX threads headers */
93 typedef pthread_t _glthread_Thread
;
95 typedef pthread_mutex_t _glthread_Mutex
;
97 #define _glthread_DECLARE_STATIC_MUTEX(name) \
98 static _glthread_Mutex name = PTHREAD_MUTEX_INITIALIZER
100 #define _glthread_INIT_MUTEX(name) \
101 pthread_mutex_init(&(name), NULL)
103 #define _glthread_DESTROY_MUTEX(name) \
104 pthread_mutex_destroy(&(name))
106 #define _glthread_LOCK_MUTEX(name) \
107 (void) pthread_mutex_lock(&(name))
109 #define _glthread_UNLOCK_MUTEX(name) \
110 (void) pthread_mutex_unlock(&(name))
112 /* This is temporarilly removed because driver binaries cannot count on
113 * the existance of _gl_DispatchTSD in libGL. It only exists in "new"
114 * libGL. We may be able to ressurect this optimization at some point
115 * for DRI driver or for software Mesa.
118 extern struct _glapi_table
* _glapi_DispatchTSD
;
119 extern _glthread_TSD _gl_DispatchTSD
;
121 #define GL_CALL(name) \
122 (((__builtin_expect( _glapi_DispatchTSD != NULL, 1 )) \
123 ? _glapi_DispatchTSD : (struct _glapi_table *) pthread_getspecific(_gl_DispatchTSD.key))-> name)
126 #endif /* PTHREADS */
132 * Solaris threads. Use only up to Solaris 2.4.
133 * Solaris 2.5 and higher provide POSIX threads.
134 * Be sure to compile with -mt on the Solaris compilers, or
135 * use -D_REENTRANT if using gcc.
137 #ifdef SOLARIS_THREADS
146 typedef thread_t _glthread_Thread
;
148 typedef mutex_t _glthread_Mutex
;
150 /* XXX need to really implement mutex-related macros */
151 #define _glthread_DECLARE_STATIC_MUTEX(name) static _glthread_Mutex name = 0
152 #define _glthread_INIT_MUTEX(name) (void) name
153 #define _glthread_DESTROY_MUTEX(name) (void) name
154 #define _glthread_LOCK_MUTEX(name) (void) name
155 #define _glthread_UNLOCK_MUTEX(name) (void) name
157 #endif /* SOLARIS_THREADS */
163 * Windows threads. Should work with Windows NT and 95.
164 * IMPORTANT: Link with multithreaded runtime library when THREADS are
175 typedef HANDLE _glthread_Thread
;
177 typedef CRITICAL_SECTION _glthread_Mutex
;
179 /* XXX need to really implement mutex-related macros */
180 #define _glthread_DECLARE_STATIC_MUTEX(name) static _glthread_Mutex name = 0
181 #define _glthread_INIT_MUTEX(name) (void) name
182 #define _glthread_DESTROY_MUTEX(name) (void) name
183 #define _glthread_LOCK_MUTEX(name) (void) name
184 #define _glthread_UNLOCK_MUTEX(name) (void) name
186 #endif /* WIN32_THREADS */
192 * XFree86 has its own thread wrapper, Xthreads.h
193 * We wrap it again for GL.
196 #include <X11/Xthreads.h>
203 typedef xthread_t _glthread_Thread
;
205 typedef xmutex_rec _glthread_Mutex
;
207 #ifdef XMUTEX_INITIALIZER
208 #define _glthread_DECLARE_STATIC_MUTEX(name) \
209 static _glthread_Mutex name = XMUTEX_INITIALIZER
211 #define _glthread_DECLARE_STATIC_MUTEX(name) \
212 static _glthread_Mutex name
215 #define _glthread_INIT_MUTEX(name) \
218 #define _glthread_DESTROY_MUTEX(name) \
219 xmutex_clear(&(name))
221 #define _glthread_LOCK_MUTEX(name) \
222 (void) xmutex_lock(&(name))
224 #define _glthread_UNLOCK_MUTEX(name) \
225 (void) xmutex_unlock(&(name))
227 #endif /* XTHREADS */
232 * BeOS threads. R5.x required.
236 #include <kernel/OS.h>
237 #include <support/TLS.h>
244 typedef thread_id _glthread_Thread
;
246 /* Use Benaphore, aka speeder semaphore */
251 typedef benaphore _glthread_Mutex
;
253 #define _glthread_DECLARE_STATIC_MUTEX(name) static _glthread_Mutex name = { 0, 0 }
254 #define _glthread_INIT_MUTEX(name) name.sem = create_sem(0, #name"_benaphore"), name.lock = 0
255 #define _glthread_DESTROY_MUTEX(name) delete_sem(name.sem), name.lock = 0
256 #define _glthread_LOCK_MUTEX(name) if (name.sem == 0) _glthread_INIT_MUTEX(name); \
257 if (atomic_add(&(name.lock), 1) >= 1) acquire_sem(name.sem)
258 #define _glthread_UNLOCK_MUTEX(name) if (atomic_add(&(name.lock), -1) > 1) release_sem(name.sem)
260 #endif /* BEOS_THREADS */
267 * THREADS not defined
270 typedef GLuint _glthread_TSD
;
272 typedef GLuint _glthread_Thread
;
274 typedef GLuint _glthread_Mutex
;
276 #define _glthread_DECLARE_STATIC_MUTEX(name) static _glthread_Mutex name = 0
278 #define _glthread_INIT_MUTEX(name) (void) name
280 #define _glthread_DESTROY_MUTEX(name) (void) name
282 #define _glthread_LOCK_MUTEX(name) (void) name
284 #define _glthread_UNLOCK_MUTEX(name) (void) name
291 * Platform independent thread specific data API.
295 _glthread_GetID(void);
299 _glthread_InitTSD(_glthread_TSD
*);
303 _glthread_GetTSD(_glthread_TSD
*);
307 _glthread_SetTSD(_glthread_TSD
*, void *);
310 # if defined(THREADS)
311 extern struct _glapi_table
* _glapi_DispatchTSD
;
312 # define GL_CALL(name) \
313 (((__builtin_expect( _glapi_DispatchTSD != NULL, 1 )) \
314 ? _glapi_DispatchTSD : _glapi_get_dispatch())-> name)
316 # define GL_CALL(name) (*(_glapi_Dispatch-> name))
317 # endif /* defined(THREADS) */
318 #endif /* ndef GL_CALL */
321 #endif /* THREADS_H */