src/mesa/glapi/glthread.h

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5.2
   4  *
   5  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
   6  *
   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
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  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:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  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
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25
  26 /*
  27  * Thread support for gl dispatch.
  28  *
  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
  33  *
  34  *
  35  *
  36  * DOCUMENTATION
  37  *
  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
  42  *
  43  * Macros:
  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
  48  *
  49  * Functions:
  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
  54  *
  55  */
  56
  57 /*
  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.
  61  */
  62
  63 #ifndef GLTHREAD_H
  64 #define GLTHREAD_H
  65
  66
  67 #if defined(USE_MGL_NAMESPACE)
  68 #define _glapi_Dispatch _mglapi_Dispatch
  69 #endif
  70
  71
  72
  73 #if (defined(PTHREADS) || defined(SOLARIS_THREADS) ||\
  74      defined(WIN32_THREADS) || defined(USE_XTHREADS) || defined(BEOS_THREADS)) \
  75     && !defined(THREADS)
  76 # define THREADS
  77 #endif
  78
  79 #ifdef VMS
  80 #include <GL/vms_x_fix.h>
  81 #endif
  82
  83 /*
  84  * POSIX threads. This should be your choice in the Unix world
  85  * whenever possible.  When building with POSIX threads, be sure
  86  * to enable any compiler flags which will cause the MT-safe
  87  * libc (if one exists) to be used when linking, as well as any
  88  * header macros for MT-safe errno, etc.  For Solaris, this is the -mt
  89  * compiler flag.  On Solaris with gcc, use -D_REENTRANT to enable
  90  * proper compiling for MT-safe libc etc.
  91  */
  92 #if defined(PTHREADS)
  93 #include <pthread.h> /* POSIX threads headers */
  94
  95 typedef struct {
  96    pthread_key_t  key;
  97    int initMagic;
  98 } _glthread_TSD;
  99
 100 typedef pthread_t _glthread_Thread;
 101
 102 typedef pthread_mutex_t _glthread_Mutex;
 103
 104 #define _glthread_DECLARE_STATIC_MUTEX(name) \
 105    static _glthread_Mutex name = PTHREAD_MUTEX_INITIALIZER
 106
 107 #define _glthread_INIT_MUTEX(name) \
 108    pthread_mutex_init(&(name), NULL)
 109
 110 #define _glthread_DESTROY_MUTEX(name) \
 111    pthread_mutex_destroy(&(name))
 112
 113 #define _glthread_LOCK_MUTEX(name) \
 114    (void) pthread_mutex_lock(&(name))
 115
 116 #define _glthread_UNLOCK_MUTEX(name) \
 117    (void) pthread_mutex_unlock(&(name))
 118
 119 #endif /* PTHREADS */
 120
 121
 122
 123
 124 /*
 125  * Solaris threads. Use only up to Solaris 2.4.
 126  * Solaris 2.5 and higher provide POSIX threads.
 127  * Be sure to compile with -mt on the Solaris compilers, or
 128  * use -D_REENTRANT if using gcc.
 129  */
 130 #ifdef SOLARIS_THREADS
 131 #include <thread.h>
 132
 133 typedef struct {
 134    thread_key_t key;
 135    mutex_t      keylock;
 136    int          initMagic;
 137 } _glthread_TSD;
 138
 139 typedef thread_t _glthread_Thread;
 140
 141 typedef mutex_t _glthread_Mutex;
 142
 143 /* XXX need to really implement mutex-related macros */
 144 #define _glthread_DECLARE_STATIC_MUTEX(name)  static _glthread_Mutex name = 0
 145 #define _glthread_INIT_MUTEX(name)  (void) name
 146 #define _glthread_DESTROY_MUTEX(name) (void) name
 147 #define _glthread_LOCK_MUTEX(name)  (void) name
 148 #define _glthread_UNLOCK_MUTEX(name)  (void) name
 149
 150 #endif /* SOLARIS_THREADS */
 151
 152
 153
 154
 155 /*
 156  * Windows threads. Should work with Windows NT and 95.
 157  * IMPORTANT: Link with multithreaded runtime library when THREADS are
 158  * used!
 159  */
 160 #ifdef WIN32_THREADS
 161 #include <windows.h>
 162
 163 typedef struct {
 164    DWORD key;
 165    int   initMagic;
 166 } _glthread_TSD;
 167
 168 typedef HANDLE _glthread_Thread;
 169
 170 typedef CRITICAL_SECTION _glthread_Mutex;
 171
 172 #define _glthread_DECLARE_STATIC_MUTEX(name)  /*static*/ _glthread_Mutex name = {0,0,0,0,0,0}
 173 #define _glthread_INIT_MUTEX(name)  InitializeCriticalSection(&name)
 174 #define _glthread_DESTROY_MUTEX(name)  DeleteCriticalSection(&name)
 175 #define _glthread_LOCK_MUTEX(name)  EnterCriticalSection(&name)
 176 #define _glthread_UNLOCK_MUTEX(name)  LeaveCriticalSection(&name)
 177
 178 #endif /* WIN32_THREADS */
 179
 180
 181
 182
 183 /*
 184  * XFree86 has its own thread wrapper, Xthreads.h
 185  * We wrap it again for GL.
 186  */
 187 #ifdef USE_XTHREADS
 188 #include <X11/Xthreads.h>
 189
 190 typedef struct {
 191    xthread_key_t key;
 192    int initMagic;
 193 } _glthread_TSD;
 194
 195 typedef xthread_t _glthread_Thread;
 196
 197 typedef xmutex_rec _glthread_Mutex;
 198
 199 #ifdef XMUTEX_INITIALIZER
 200 #define _glthread_DECLARE_STATIC_MUTEX(name) \
 201    static _glthread_Mutex name = XMUTEX_INITIALIZER
 202 #else
 203 #define _glthread_DECLARE_STATIC_MUTEX(name) \
 204    static _glthread_Mutex name
 205 #endif
 206
 207 #define _glthread_INIT_MUTEX(name) \
 208    xmutex_init(&(name))
 209
 210 #define _glthread_DESTROY_MUTEX(name) \
 211    xmutex_clear(&(name))
 212
 213 #define _glthread_LOCK_MUTEX(name) \
 214    (void) xmutex_lock(&(name))
 215
 216 #define _glthread_UNLOCK_MUTEX(name) \
 217    (void) xmutex_unlock(&(name))
 218
 219 #endif /* USE_XTHREADS */
 220
 221
 222
 223 /*
 224  * BeOS threads. R5.x required.
 225  */
 226 #ifdef BEOS_THREADS
 227
 228 #include <kernel/OS.h>
 229 #include <support/TLS.h>
 230
 231 typedef struct {
 232    int32        key;
 233    int          initMagic;
 234 } _glthread_TSD;
 235
 236 typedef thread_id _glthread_Thread;
 237
 238 /* Use Benaphore, aka speeder semaphore */
 239 typedef struct {
 240     int32   lock;
 241     sem_id  sem;
 242 } benaphore;
 243 typedef benaphore _glthread_Mutex;
 244
 245 #define _glthread_DECLARE_STATIC_MUTEX(name)  static _glthread_Mutex name = { 0, 0 }
 246 #define _glthread_INIT_MUTEX(name)      name.sem = create_sem(0, #name"_benaphore"), name.lock = 0
 247 #define _glthread_DESTROY_MUTEX(name)   delete_sem(name.sem), name.lock = 0
 248 #define _glthread_LOCK_MUTEX(name)      if (name.sem == 0) _glthread_INIT_MUTEX(name); \
 249                                                                                 if (atomic_add(&(name.lock), 1) >= 1) acquire_sem(name.sem)
 250 #define _glthread_UNLOCK_MUTEX(name)    if (atomic_add(&(name.lock), -1) > 1) release_sem(name.sem)
 251
 252 #endif /* BEOS_THREADS */
 253
 254
 255
 256 #ifndef THREADS
 257
 258 /*
 259  * THREADS not defined
 260  */
 261
 262 typedef int _glthread_TSD;
 263
 264 typedef int _glthread_Thread;
 265
 266 typedef int _glthread_Mutex;
 267
 268 #define _glthread_DECLARE_STATIC_MUTEX(name)  static _glthread_Mutex name = 0
 269
 270 #define _glthread_INIT_MUTEX(name)  (void) name
 271
 272 #define _glthread_DESTROY_MUTEX(name)  (void) name
 273
 274 #define _glthread_LOCK_MUTEX(name)  (void) name
 275
 276 #define _glthread_UNLOCK_MUTEX(name)  (void) name
 277
 278 #endif /* THREADS */
 279
 280
 281
 282 /*
 283  * Platform independent thread specific data API.
 284  */
 285
 286 extern unsigned long
 287 _glthread_GetID(void);
 288
 289
 290 extern void
 291 _glthread_InitTSD(_glthread_TSD *);
 292
 293
 294 extern void *
 295 _glthread_GetTSD(_glthread_TSD *);
 296
 297
 298 extern void
 299 _glthread_SetTSD(_glthread_TSD *, void *);
 300
 301 #if defined(GLX_USE_TLS)
 302
 303 extern __thread struct _glapi_table * _glapi_tls_Dispatch
 304     __attribute__((tls_model("initial-exec")));
 305
 306 #define GET_DISPATCH() _glapi_tls_Dispatch
 307
 308 #elif !defined(GL_CALL)
 309 # if defined(THREADS)
 310 #  define GET_DISPATCH() \
 311    ((__builtin_expect( _glapi_Dispatch != NULL, 1 )) \
 312        ? _glapi_Dispatch : _glapi_get_dispatch())
 313 # else
 314 #  define GET_DISPATCH() _glapi_Dispatch
 315 # endif /* defined(THREADS) */
 316 #endif  /* ndef GL_CALL */
 317
 318
 319 #endif /* THREADS_H */