src/mesa/glapi/glthread.h

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5.1
   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(PTHREADS) || defined(SOLARIS_THREADS) ||\
  68      defined(WIN32_THREADS) || defined(USE_XTHREADS) || defined(BEOS_THREADS)) \
  69     && !defined(THREADS)
  70 # define THREADS
  71 #endif
  72
  73 #ifdef VMS
  74 #include <GL/vms_x_fix.h>
  75 #endif
  76
  77 /*
  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.
  85  */
  86 #if defined(PTHREADS)
  87 #include <pthread.h> /* POSIX threads headers */
  88
  89 typedef struct {
  90    pthread_key_t  key;
  91    int initMagic;
  92 } _glthread_TSD;
  93
  94 typedef pthread_t _glthread_Thread;
  95
  96 typedef pthread_mutex_t _glthread_Mutex;
  97
  98 #define _glthread_DECLARE_STATIC_MUTEX(name) \
  99    static _glthread_Mutex name = PTHREAD_MUTEX_INITIALIZER
 100
 101 #define _glthread_INIT_MUTEX(name) \
 102    pthread_mutex_init(&(name), NULL)
 103
 104 #define _glthread_DESTROY_MUTEX(name) \
 105    pthread_mutex_destroy(&(name))
 106
 107 #define _glthread_LOCK_MUTEX(name) \
 108    (void) pthread_mutex_lock(&(name))
 109
 110 #define _glthread_UNLOCK_MUTEX(name) \
 111    (void) pthread_mutex_unlock(&(name))
 112
 113 #endif /* PTHREADS */
 114
 115
 116
 117
 118 /*
 119  * Solaris threads. Use only up to Solaris 2.4.
 120  * Solaris 2.5 and higher provide POSIX threads.
 121  * Be sure to compile with -mt on the Solaris compilers, or
 122  * use -D_REENTRANT if using gcc.
 123  */
 124 #ifdef SOLARIS_THREADS
 125 #include <thread.h>
 126
 127 typedef struct {
 128    thread_key_t key;
 129    mutex_t      keylock;
 130    int          initMagic;
 131 } _glthread_TSD;
 132
 133 typedef thread_t _glthread_Thread;
 134
 135 typedef mutex_t _glthread_Mutex;
 136
 137 /* XXX need to really implement mutex-related macros */
 138 #define _glthread_DECLARE_STATIC_MUTEX(name)  static _glthread_Mutex name = 0
 139 #define _glthread_INIT_MUTEX(name)  (void) name
 140 #define _glthread_DESTROY_MUTEX(name) (void) name
 141 #define _glthread_LOCK_MUTEX(name)  (void) name
 142 #define _glthread_UNLOCK_MUTEX(name)  (void) name
 143
 144 #endif /* SOLARIS_THREADS */
 145
 146
 147
 148
 149 /*
 150  * Windows threads. Should work with Windows NT and 95.
 151  * IMPORTANT: Link with multithreaded runtime library when THREADS are
 152  * used!
 153  */
 154 #ifdef WIN32_THREADS
 155 #include <windows.h>
 156
 157 typedef struct {
 158    DWORD key;
 159    int   initMagic;
 160 } _glthread_TSD;
 161
 162 typedef HANDLE _glthread_Thread;
 163
 164 typedef CRITICAL_SECTION _glthread_Mutex;
 165
 166 #define _glthread_DECLARE_STATIC_MUTEX(name)  /*static*/ _glthread_Mutex name = {0,0,0,0,0,0}
 167 #define _glthread_INIT_MUTEX(name)  InitializeCriticalSection(&name)
 168 #define _glthread_DESTROY_MUTEX(name)  DeleteCriticalSection(&name)
 169 #define _glthread_LOCK_MUTEX(name)  EnterCriticalSection(&name)
 170 #define _glthread_UNLOCK_MUTEX(name)  LeaveCriticalSection(&name)
 171
 172 #endif /* WIN32_THREADS */
 173
 174
 175
 176
 177 /*
 178  * XFree86 has its own thread wrapper, Xthreads.h
 179  * We wrap it again for GL.
 180  */
 181 #ifdef USE_XTHREADS
 182 #include <X11/Xthreads.h>
 183
 184 typedef struct {
 185    xthread_key_t key;
 186    int initMagic;
 187 } _glthread_TSD;
 188
 189 typedef xthread_t _glthread_Thread;
 190
 191 typedef xmutex_rec _glthread_Mutex;
 192
 193 #ifdef XMUTEX_INITIALIZER
 194 #define _glthread_DECLARE_STATIC_MUTEX(name) \
 195    static _glthread_Mutex name = XMUTEX_INITIALIZER
 196 #else
 197 #define _glthread_DECLARE_STATIC_MUTEX(name) \
 198    static _glthread_Mutex name
 199 #endif
 200
 201 #define _glthread_INIT_MUTEX(name) \
 202    xmutex_init(&(name))
 203
 204 #define _glthread_DESTROY_MUTEX(name) \
 205    xmutex_clear(&(name))
 206
 207 #define _glthread_LOCK_MUTEX(name) \
 208    (void) xmutex_lock(&(name))
 209
 210 #define _glthread_UNLOCK_MUTEX(name) \
 211    (void) xmutex_unlock(&(name))
 212
 213 #endif /* USE_XTHREADS */
 214
 215
 216
 217 /*
 218  * BeOS threads. R5.x required.
 219  */
 220 #ifdef BEOS_THREADS
 221
 222 #include <kernel/OS.h>
 223 #include <support/TLS.h>
 224
 225 typedef struct {
 226    int32        key;
 227    int          initMagic;
 228 } _glthread_TSD;
 229
 230 typedef thread_id _glthread_Thread;
 231
 232 /* Use Benaphore, aka speeder semaphore */
 233 typedef struct {
 234     int32   lock;
 235     sem_id  sem;
 236 } benaphore;
 237 typedef benaphore _glthread_Mutex;
 238
 239 #define _glthread_DECLARE_STATIC_MUTEX(name)  static _glthread_Mutex name = { 0, 0 }
 240 #define _glthread_INIT_MUTEX(name)      name.sem = create_sem(0, #name"_benaphore"), name.lock = 0
 241 #define _glthread_DESTROY_MUTEX(name)   delete_sem(name.sem), name.lock = 0
 242 #define _glthread_LOCK_MUTEX(name)      if (name.sem == 0) _glthread_INIT_MUTEX(name); \
 243                                                                                 if (atomic_add(&(name.lock), 1) >= 1) acquire_sem(name.sem)
 244 #define _glthread_UNLOCK_MUTEX(name)    if (atomic_add(&(name.lock), -1) > 1) release_sem(name.sem)
 245
 246 #endif /* BEOS_THREADS */
 247
 248
 249
 250 #ifndef THREADS
 251
 252 /*
 253  * THREADS not defined
 254  */
 255
 256 typedef GLuint _glthread_TSD;
 257
 258 typedef GLuint _glthread_Thread;
 259
 260 typedef GLuint _glthread_Mutex;
 261
 262 #define _glthread_DECLARE_STATIC_MUTEX(name)  static _glthread_Mutex name = 0
 263
 264 #define _glthread_INIT_MUTEX(name)  (void) name
 265
 266 #define _glthread_DESTROY_MUTEX(name)  (void) name
 267
 268 #define _glthread_LOCK_MUTEX(name)  (void) name
 269
 270 #define _glthread_UNLOCK_MUTEX(name)  (void) name
 271
 272 #endif /* THREADS */
 273
 274
 275
 276 /*
 277  * Platform independent thread specific data API.
 278  */
 279
 280 extern unsigned long
 281 _glthread_GetID(void);
 282
 283
 284 extern void
 285 _glthread_InitTSD(_glthread_TSD *);
 286
 287
 288 extern void *
 289 _glthread_GetTSD(_glthread_TSD *);
 290
 291
 292 extern void
 293 _glthread_SetTSD(_glthread_TSD *, void *);
 294
 295 #if defined(GLX_USE_TLS)
 296
 297 extern __thread struct _glapi_table * _glapi_tls_Dispatch
 298     __attribute__((tls_model("initial-exec")));
 299
 300 #define GET_DISPATCH() _glapi_tls_Dispatch
 301
 302 #elif !defined(GL_CALL)
 303 # if defined(THREADS)
 304 #  define GET_DISPATCH() \
 305    ((__builtin_expect( _glapi_Dispatch != NULL, 1 )) \
 306        ? _glapi_Dispatch : _glapi_get_dispatch())
 307 # else
 308 #  define GET_DISPATCH() _glapi_Dispatch
 309 # endif /* defined(THREADS) */
 310 #endif  /* ndef GL_CALL */
 311
 312
 313 #endif /* THREADS_H */