3 * Mesa 3-D graphics library
6 * Copyright (C) 1999-2001 Brian Paul All Rights Reserved.
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
15 * The above copyright notice and this permission notice shall be included
16 * in all copies or substantial portions of the Software.
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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23 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
28 * Thread support for gl dispatch.
30 * Initial version by John Stone (j.stone@acm.org) (johns@cs.umr.edu)
31 * and Christoph Poliwoda (poliwoda@volumegraphics.com)
32 * Revised by Keith Whitwell
33 * Adapted for new gl dispatcher by Brian Paul
39 * This thread module exports the following types:
40 * _glthread_TSD Thread-specific data area
41 * _glthread_Thread Thread datatype
42 * _glthread_Mutex Mutual exclusion lock
45 * _glthread_DECLARE_STATIC_MUTEX(name) Declare a non-local mutex
46 * _glthread_INIT_MUTEX(name) Initialize a mutex
47 * _glthread_LOCK_MUTEX(name) Lock a mutex
48 * _glthread_UNLOCK_MUTEX(name) Unlock a mutex
51 * _glthread_GetID(v) Get integer thread ID
52 * _glthread_InitTSD() Initialize thread-specific data
53 * _glthread_GetTSD() Get thread-specific data
54 * _glthread_SetTSD() Set thread-specific data
59 * If this file is accidentally included by a non-threaded build,
60 * it should not cause the build to fail, or otherwise cause problems.
61 * In general, it should only be included when needed however.
68 #if defined(PTHREADS) || defined(SOLARIS_THREADS) || defined(WIN32_THREADS) || \
69 defined(XTHREADS) || defined(BEOS_THREADS)
74 #include <GL/vms_x_fix.h>
78 * POSIX threads. This should be your choice in the Unix world
79 * whenever possible. When building with POSIX threads, be sure
80 * to enable any compiler flags which will cause the MT-safe
81 * libc (if one exists) to be used when linking, as well as any
82 * header macros for MT-safe errno, etc. For Solaris, this is the -mt
83 * compiler flag. On Solaris with gcc, use -D_REENTRANT to enable
84 * proper compiling for MT-safe libc etc.
87 #include <pthread.h> /* POSIX threads headers */
94 typedef pthread_t _glthread_Thread
;
96 typedef pthread_mutex_t _glthread_Mutex
;
98 #define _glthread_DECLARE_STATIC_MUTEX(name) \
99 static _glthread_Mutex name = PTHREAD_MUTEX_INITIALIZER
101 #define _glthread_INIT_MUTEX(name) \
102 pthread_mutex_init(&(name), NULL)
104 #define _glthread_DESTROY_MUTEX(name) \
105 pthread_mutex_destroy(&(name))
107 #define _glthread_LOCK_MUTEX(name) \
108 (void) pthread_mutex_lock(&(name))
110 #define _glthread_UNLOCK_MUTEX(name) \
111 (void) pthread_mutex_unlock(&(name))
113 /* This is temporarilly removed because driver binaries cannot count on
114 * the existance of _gl_DispatchTSD in libGL. It only exists in "new"
115 * libGL. We may be able to ressurect this optimization at some point
116 * for DRI driver or for software Mesa.
119 extern struct _glapi_table
* _glapi_DispatchTSD
;
120 extern _glthread_TSD _gl_DispatchTSD
;
122 #define GL_CALL(name) \
123 (((__builtin_expect( _glapi_DispatchTSD != NULL, 1 )) \
124 ? _glapi_DispatchTSD : (struct _glapi_table *) pthread_getspecific(_gl_DispatchTSD.key))-> name)
127 #endif /* PTHREADS */
133 * Solaris threads. Use only up to Solaris 2.4.
134 * Solaris 2.5 and higher provide POSIX threads.
135 * Be sure to compile with -mt on the Solaris compilers, or
136 * use -D_REENTRANT if using gcc.
138 #ifdef SOLARIS_THREADS
147 typedef thread_t _glthread_Thread
;
149 typedef mutex_t _glthread_Mutex
;
151 /* XXX need to really implement mutex-related macros */
152 #define _glthread_DECLARE_STATIC_MUTEX(name) static _glthread_Mutex name = 0
153 #define _glthread_INIT_MUTEX(name) (void) name
154 #define _glthread_DESTROY_MUTEX(name) (void) name
155 #define _glthread_LOCK_MUTEX(name) (void) name
156 #define _glthread_UNLOCK_MUTEX(name) (void) name
158 #endif /* SOLARIS_THREADS */
164 * Windows threads. Should work with Windows NT and 95.
165 * IMPORTANT: Link with multithreaded runtime library when THREADS are
176 typedef HANDLE _glthread_Thread
;
178 typedef CRITICAL_SECTION _glthread_Mutex
;
180 /* XXX need to really implement mutex-related macros */
181 #define _glthread_DECLARE_STATIC_MUTEX(name) static _glthread_Mutex name = 0
182 #define _glthread_INIT_MUTEX(name) (void) name
183 #define _glthread_DESTROY_MUTEX(name) (void) name
184 #define _glthread_LOCK_MUTEX(name) (void) name
185 #define _glthread_UNLOCK_MUTEX(name) (void) name
187 #endif /* WIN32_THREADS */
193 * XFree86 has its own thread wrapper, Xthreads.h
194 * We wrap it again for GL.
197 #include "Xthreads.h"
204 typedef xthread_t _glthread_Thread
;
206 typedef xmutex_rec _glthread_Mutex
;
208 #ifdef XMUTEX_INITIALIZER
209 #define _glthread_DECLARE_STATIC_MUTEX(name) \
210 static _glthread_Mutex name = XMUTEX_INITIALIZER
212 #define _glthread_DECLARE_STATIC_MUTEX(name) \
213 static _glthread_Mutex name
216 #define _glthread_INIT_MUTEX(name) \
219 #define _glthread_DESTROY_MUTEX(name) \
220 xmutex_clear(&(name))
222 #define _glthread_LOCK_MUTEX(name) \
223 (void) xmutex_lock(&(name))
225 #define _glthread_UNLOCK_MUTEX(name) \
226 (void) xmutex_unlock(&(name))
228 #endif /* XTHREADS */
233 * BeOS threads. R5.x required.
237 #include <kernel/OS.h>
238 #include <support/TLS.h>
245 typedef thread_id _glthread_Thread
;
247 /* Use Benaphore, aka speeder semaphore */
252 typedef benaphore _glthread_Mutex
;
254 #define _glthread_DECLARE_STATIC_MUTEX(name) static _glthread_Mutex name = { 0, 0 }
255 #define _glthread_INIT_MUTEX(name) name.sem = create_sem(0, #name"_benaphore"), name.lock = 0
256 #define _glthread_DESTROY_MUTEX(name) delete_sem(name.sem), name.lock = 0
257 #define _glthread_LOCK_MUTEX(name) if (name.sem == 0) _glthread_INIT_MUTEX(name); \
258 if (atomic_add(&(name.lock), 1) >= 1) acquire_sem(name.sem)
259 #define _glthread_UNLOCK_MUTEX(name) if (atomic_add(&(name.lock), -1) > 1) release_sem(name.sem)
261 #endif /* BEOS_THREADS */
268 * THREADS not defined
271 typedef GLuint _glthread_TSD
;
273 typedef GLuint _glthread_Thread
;
275 typedef GLuint _glthread_Mutex
;
277 #define _glthread_DECLARE_STATIC_MUTEX(name) static _glthread_Mutex name = 0
279 #define _glthread_INIT_MUTEX(name) (void) name
281 #define _glthread_DESTROY_MUTEX(name) (void) name
283 #define _glthread_LOCK_MUTEX(name) (void) name
285 #define _glthread_UNLOCK_MUTEX(name) (void) name
292 * Platform independent thread specific data API.
296 _glthread_GetID(void);
300 _glthread_InitTSD(_glthread_TSD
*);
304 _glthread_GetTSD(_glthread_TSD
*);
308 _glthread_SetTSD(_glthread_TSD
*, void *);
311 # if defined(THREADS)
312 extern struct _glapi_table
* _glapi_DispatchTSD
;
313 # define GL_CALL(name) \
314 (((__builtin_expect( _glapi_DispatchTSD != NULL, 1 )) \
315 ? _glapi_DispatchTSD : _glapi_get_dispatch())-> name)
317 # define GL_CALL(name) (*(_glapi_Dispatch-> name))
318 # endif /* defined(THREADS) */
319 #endif /* ndef GL_CALL */
322 #endif /* THREADS_H */