src/mesa/glapi/glthread.c

   1 /* $Id: glthread.c,v 1.5 2000/02/10 21:54:06 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.3
   6  *
   7  * Copyright (C) 1999-2000  Brian Paul   All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  */
  26
  27
  28 /*
  29  * XXX There's probably some work to do in order to make this file
  30  * truly reusable outside of Mesa.  First, the glheader.h include must go.
  31  */
  32
  33
  34 #ifdef PC_ALL
  35 #include "all.h"
  36 #else
  37 #include "glheader.h"
  38 #include "glthread.h"
  39 #endif
  40
  41
  42 /*
  43  * This file should still compile even when THREADS is not defined.
  44  * This is to make things easier to deal with on the makefile scene..
  45  */
  46 #ifdef THREADS
  47 #include <errno.h>
  48
  49 /*
  50  * Error messages
  51  */
  52 #define INIT_TSD_ERROR "_glthread_: failed to allocate key for thread specific data"
  53 #define GET_TSD_ERROR "_glthread_: failed to get thread specific data"
  54 #define SET_TSD_ERROR "_glthread_: thread failed to set thread specific data"
  55
  56
  57 /*
  58  * Magic number to determine if a TSD object has been initialized.
  59  * Kind of a hack but there doesn't appear to be a better cross-platform
  60  * solution.
  61  */
  62 #define INIT_MAGIC 0xff8adc98
  63
  64
  65
  66 /*
  67  * POSIX Threads -- The best way to go if your platform supports them.
  68  *                  Solaris >= 2.5 have POSIX threads, IRIX >= 6.4 reportedly
  69  *                  has them, and many of the free Unixes now have them.
  70  *                  Be sure to use appropriate -mt or -D_REENTRANT type
  71  *                  compile flags when building.
  72  */
  73 #ifdef PTHREADS
  74
  75 unsigned long
  76 _glthread_GetID(void)
  77 {
  78    return (unsigned long) pthread_self();
  79 }
  80
  81
  82 void
  83 _glthread_InitTSD(_glthread_TSD *tsd)
  84 {
  85    if (pthread_key_create(&tsd->key, NULL/*free*/) != 0) {
  86       perror(INIT_TSD_ERROR);
  87       exit(-1);
  88    }
  89    tsd->initMagic = INIT_MAGIC;
  90 }
  91
  92
  93 void *
  94 _glthread_GetTSD(_glthread_TSD *tsd)
  95 {
  96    if (tsd->initMagic != INIT_MAGIC) {
  97       _glthread_InitTSD(tsd);
  98    }
  99    return pthread_getspecific(tsd->key);
 100 }
 101
 102
 103 void
 104 _glthread_SetTSD(_glthread_TSD *tsd, void *ptr)
 105 {
 106    if (tsd->initMagic != INIT_MAGIC) {
 107       _glthread_InitTSD(tsd);
 108    }
 109    if (pthread_setspecific(tsd->key, ptr) != 0) {
 110       perror(SET_TSD_ERROR);
 111       exit(-1);
 112    }
 113 }
 114
 115 #endif /* PTHREADS */
 116
 117
 118
 119 /*
 120  * Solaris/Unix International Threads -- Use only if POSIX threads
 121  *   aren't available on your Unix platform.  Solaris 2.[34] are examples
 122  *   of platforms where this is the case.  Be sure to use -mt and/or
 123  *   -D_REENTRANT when compiling.
 124  */
 125 #ifdef SOLARIS_THREADS
 126 #define USE_LOCK_FOR_KEY        /* undef this to try a version without
 127                                    lock for the global key... */
 128
 129 unsigned long
 130 _glthread_GetID(void)
 131 {
 132    abort();   /* XXX not implemented yet */
 133    return (unsigned long) 0;
 134 }
 135
 136
 137 void
 138 _glthread_InitTSD(_glthread_TSD *tsd)
 139 {
 140    if ((errno = mutex_init(&tsd->keylock, 0, NULL)) != 0 ||
 141       (errno = thr_keycreate(&(tsd->key), free)) != 0) {
 142       perror(INIT_TSD_ERROR);
 143       exit(-1);
 144    }
 145    tsd->initMagic = INIT_MAGIC;
 146 }
 147
 148
 149 void *
 150 _glthread_GetTSD(_glthread_TSD *tsd)
 151 {
 152    void* ret;
 153    if (tsd->initMagic != INIT_MAGIC) {
 154       _glthread_InitTSD(tsd);
 155    }
 156 #ifdef USE_LOCK_FOR_KEY
 157    mutex_lock(&tsd->keylock);
 158    thr_getspecific(tsd->key, &ret);
 159    mutex_unlock(&tsd->keylock);
 160 #else
 161    if ((errno = thr_getspecific(tsd->key, &ret)) != 0) {
 162       perror(GET_TSD_ERROR);
 163       exit(-1);
 164    }
 165 #endif
 166    return ret;
 167 }
 168
 169
 170 void
 171 _glthread_SetTSD(_glthread_TSD *tsd, void *ptr)
 172 {
 173    if (tsd->initMagic != INIT_MAGIC) {
 174       _glthread_InitTSD(tsd);
 175    }
 176    if ((errno = thr_setspecific(tsd->key, ptr)) != 0) {
 177       perror(SET_TSD_ERROR);
 178       exit(-1);
 179    }
 180 }
 181
 182 #undef USE_LOCK_FOR_KEY
 183 #endif /* SOLARIS_THREADS */
 184
 185
 186
 187 /*
 188  * Win32 Threads.  The only available option for Windows 95/NT.
 189  * Be sure that you compile using the Multithreaded runtime, otherwise
 190  * bad things will happen.
 191  */
 192 #ifdef WIN32
 193
 194 unsigned long
 195 _glthread_GetID(void)
 196 {
 197    abort();   /* XXX not implemented yet */
 198    return (unsigned long) 0;
 199 }
 200
 201
 202 void
 203 _glthread_InitTSD(_glthread_TSD *tsd)
 204 {
 205    tsd->key = TlsAlloc();
 206    if (tsd->key == 0xffffffff) {
 207       /* Can Windows handle stderr messages for non-console
 208          applications? Does Windows have perror? */
 209       /* perror(SET_INIT_ERROR);*/
 210       exit(-1);
 211    }
 212    tsd->initMagic = INIT_MAGIC;
 213 }
 214
 215
 216 void *
 217 _glthread_GetTSD(_glthread_TSD *tsd)
 218 {
 219    if (tsd->initMagic != INIT_MAGIC) {
 220       _glthread_InitTSD(tsd);
 221    }
 222    return TlsGetValue(tsd->key);
 223 }
 224
 225
 226 void
 227 _glthread_SetTSD(_glthread_TSD *tsd, void *ptr)
 228 {
 229    /* the following code assumes that the _glthread_TSD has been initialized
 230       to zero at creation */
 231    if (tsd->initMagic != INIT_MAGIC) {
 232       _glthread_InitTSD(tsd);
 233    }
 234    if (TlsSetValue(tsd->key, ptr) == 0) {
 235       /* Can Windows handle stderr messages for non-console
 236          applications? Does Windows have perror? */
 237       /* perror(SET_TSD_ERROR);*/
 238       exit(-1);
 239    }
 240 }
 241
 242 #endif /* WIN32 */
 243
 244
 245
 246 /*
 247  * XFree86 has its own thread wrapper, Xthreads.h
 248  * We wrap it again for GL.
 249  */
 250 #ifdef XTHREADS
 251
 252 unsigned long
 253 _glthread_GetID(void)
 254 {
 255    return (unsigned long) xthread_self();
 256 }
 257
 258
 259 void
 260 _glthread_InitTSD(_glthread_TSD *tsd)
 261 {
 262    if (xthread_key_create(&tsd->key, NULL) != 0) {
 263       perror(INIT_TSD_ERROR);
 264       exit(-1);
 265    }
 266    tsd->initMagic = INIT_MAGIC;
 267 }
 268
 269
 270 void *
 271 _glthread_GetTSD(_glthread_TSD *tsd)
 272 {
 273    void *ptr;
 274    if (tsd->initMagic != INIT_MAGIC) {
 275       _glthread_InitTSD(tsd);
 276    }
 277    xthread_get_specific(tsd->key, &ptr);
 278    return ptr;
 279 }
 280
 281
 282 void
 283 _glthread_SetTSD(_glthread_TSD *tsd, void *ptr)
 284 {
 285    if (tsd->initMagic != INIT_MAGIC) {
 286       _glthread_InitTSD(tsd);
 287    }
 288    xthread_set_specific(tsd->key, ptr);
 289 }
 290
 291 #endif /* XTHREAD */
 292
 293
 294
 295 #else  /* THREADS */
 296
 297
 298 /*
 299  * no-op functions
 300  */
 301
 302 unsigned long
 303 _glthread_GetID(void)
 304 {
 305    return 0;
 306 }
 307
 308
 309 void
 310 _glthread_InitTSD(_glthread_TSD *tsd)
 311 {
 312    (void) tsd;
 313 }
 314
 315
 316 void *
 317 _glthread_GetTSD(_glthread_TSD *tsd)
 318 {
 319    (void) tsd;
 320    return NULL;
 321 }
 322
 323
 324 void
 325 _glthread_SetTSD(_glthread_TSD *tsd, void *ptr)
 326 {
 327    (void) tsd;
 328    (void) ptr;
 329 }
 330
 331
 332 #endif /* THREADS */