src/mesa/glapi/glthread.c

   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  * XXX There's probably some work to do in order to make this file
  28  * truly reusable outside of Mesa.  First, the glheader.h include must go.
  29  */
  30
  31 #ifdef HAVE_DIX_CONFIG_H
  32 #include <dix-config.h>
  33 #include "glapi/mesa.h"
  34 #else
  35 #include "main/compiler.h"
  36 #endif
  37
  38 #include "glapi/glthread.h"
  39
  40
  41 /*
  42  * This file should still compile even when THREADS is not defined.
  43  * This is to make things easier to deal with on the makefile scene..
  44  */
  45 #ifdef THREADS
  46 #include <errno.h>
  47
  48 /*
  49  * Error messages
  50  */
  51 #define INIT_TSD_ERROR "_glthread_: failed to allocate key for thread specific data"
  52 #define GET_TSD_ERROR "_glthread_: failed to get thread specific data"
  53 #define SET_TSD_ERROR "_glthread_: thread failed to set thread specific data"
  54
  55
  56 /*
  57  * Magic number to determine if a TSD object has been initialized.
  58  * Kind of a hack but there doesn't appear to be a better cross-platform
  59  * solution.
  60  */
  61 #define INIT_MAGIC 0xff8adc98
  62
  63
  64
  65 /*
  66  * POSIX Threads -- The best way to go if your platform supports them.
  67  *                  Solaris >= 2.5 have POSIX threads, IRIX >= 6.4 reportedly
  68  *                  has them, and many of the free Unixes now have them.
  69  *                  Be sure to use appropriate -mt or -D_REENTRANT type
  70  *                  compile flags when building.
  71  */
  72 #ifdef PTHREADS
  73
  74 PUBLIC unsigned long
  75 _glthread_GetID(void)
  76 {
  77    return (unsigned long) pthread_self();
  78 }
  79
  80
  81 void
  82 _glthread_InitTSD(_glthread_TSD *tsd)
  83 {
  84    if (pthread_key_create(&tsd->key, NULL/*free*/) != 0) {
  85       perror(INIT_TSD_ERROR);
  86       exit(-1);
  87    }
  88    tsd->initMagic = INIT_MAGIC;
  89 }
  90
  91
  92 void *
  93 _glthread_GetTSD(_glthread_TSD *tsd)
  94 {
  95    if (tsd->initMagic != (int) INIT_MAGIC) {
  96       _glthread_InitTSD(tsd);
  97    }
  98    return pthread_getspecific(tsd->key);
  99 }
 100
 101
 102 void
 103 _glthread_SetTSD(_glthread_TSD *tsd, void *ptr)
 104 {
 105    if (tsd->initMagic != (int) INIT_MAGIC) {
 106       _glthread_InitTSD(tsd);
 107    }
 108    if (pthread_setspecific(tsd->key, ptr) != 0) {
 109       perror(SET_TSD_ERROR);
 110       exit(-1);
 111    }
 112 }
 113
 114 #endif /* PTHREADS */
 115
 116
 117
 118 /*
 119  * Win32 Threads.  The only available option for Windows 95/NT.
 120  * Be sure that you compile using the Multithreaded runtime, otherwise
 121  * bad things will happen.
 122  */
 123 #ifdef WIN32_THREADS
 124
 125 static void InsteadOf_exit(int nCode)
 126 {
 127    DWORD dwErr = GetLastError();
 128 }
 129
 130 PUBLIC unsigned long
 131 _glthread_GetID(void)
 132 {
 133    return GetCurrentThreadId();
 134 }
 135
 136
 137 void
 138 _glthread_InitTSD(_glthread_TSD *tsd)
 139 {
 140    tsd->key = TlsAlloc();
 141    if (tsd->key == TLS_OUT_OF_INDEXES) {
 142       perror(INIT_TSD_ERROR);
 143       InsteadOf_exit(-1);
 144    }
 145    tsd->initMagic = INIT_MAGIC;
 146 }
 147
 148
 149 void
 150 _glthread_DestroyTSD(_glthread_TSD *tsd)
 151 {
 152    if (tsd->initMagic != INIT_MAGIC) {
 153       return;
 154    }
 155    TlsFree(tsd->key);
 156    tsd->initMagic = 0x0;
 157 }
 158
 159
 160 void *
 161 _glthread_GetTSD(_glthread_TSD *tsd)
 162 {
 163    if (tsd->initMagic != INIT_MAGIC) {
 164       _glthread_InitTSD(tsd);
 165    }
 166    return TlsGetValue(tsd->key);
 167 }
 168
 169
 170 void
 171 _glthread_SetTSD(_glthread_TSD *tsd, void *ptr)
 172 {
 173    /* the following code assumes that the _glthread_TSD has been initialized
 174       to zero at creation */
 175    if (tsd->initMagic != INIT_MAGIC) {
 176       _glthread_InitTSD(tsd);
 177    }
 178    if (TlsSetValue(tsd->key, ptr) == 0) {
 179       perror(SET_TSD_ERROR);
 180       InsteadOf_exit(-1);
 181    }
 182 }
 183
 184 #endif /* WIN32_THREADS */
 185
 186 /*
 187  * BeOS threads
 188  */
 189 #ifdef BEOS_THREADS
 190
 191 PUBLIC unsigned long
 192 _glthread_GetID(void)
 193 {
 194    return (unsigned long) find_thread(NULL);
 195 }
 196
 197 void
 198 _glthread_InitTSD(_glthread_TSD *tsd)
 199 {
 200    tsd->key = tls_allocate();
 201    tsd->initMagic = INIT_MAGIC;
 202 }
 203
 204 void *
 205 _glthread_GetTSD(_glthread_TSD *tsd)
 206 {
 207    if (tsd->initMagic != (int) INIT_MAGIC) {
 208       _glthread_InitTSD(tsd);
 209    }
 210    return tls_get(tsd->key);
 211 }
 212
 213 void
 214 _glthread_SetTSD(_glthread_TSD *tsd, void *ptr)
 215 {
 216    if (tsd->initMagic != (int) INIT_MAGIC) {
 217       _glthread_InitTSD(tsd);
 218    }
 219    tls_set(tsd->key, ptr);
 220 }
 221
 222 #endif /* BEOS_THREADS */
 223
 224
 225
 226 #else  /* THREADS */
 227
 228
 229 /*
 230  * no-op functions
 231  */
 232
 233 PUBLIC unsigned long
 234 _glthread_GetID(void)
 235 {
 236    return 0;
 237 }
 238
 239
 240 void
 241 _glthread_InitTSD(_glthread_TSD *tsd)
 242 {
 243    (void) tsd;
 244 }
 245
 246
 247 void *
 248 _glthread_GetTSD(_glthread_TSD *tsd)
 249 {
 250    (void) tsd;
 251    return NULL;
 252 }
 253
 254
 255 void
 256 _glthread_SetTSD(_glthread_TSD *tsd, void *ptr)
 257 {
 258    (void) tsd;
 259    (void) ptr;
 260 }
 261
 262
 263 #endif /* THREADS */