glx/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  * XXX There's probably some work to do in order to make this file
  27  * truly reusable outside of Mesa.
  28  */
  29
  30 #ifdef HAVE_DIX_CONFIG_H
  31 #include <dix-config.h>
  32 #include <X11/Xfuncproto.h>
  33 #endif
  34
  35 #include <stdlib.h>
  36 #include <stdio.h>
  37 #include "glthread.h"
  38
  39 /*
  40  * This file should still compile even when THREADS is not defined.
  41  * This is to make things easier to deal with on the makefile scene..
  42  */
  43 #ifdef THREADS
  44 #include <errno.h>
  45
  46 /*
  47  * Error messages
  48  */
  49 #define INIT_TSD_ERROR "_glthread_: failed to allocate key for thread specific data"
  50 #define GET_TSD_ERROR "_glthread_: failed to get thread specific data"
  51 #define SET_TSD_ERROR "_glthread_: thread failed to set thread specific data"
  52
  53 /*
  54  * Magic number to determine if a TSD object has been initialized.
  55  * Kind of a hack but there doesn't appear to be a better cross-platform
  56  * solution.
  57  */
  58 #define INIT_MAGIC 0xff8adc98
  59
  60 /*
  61  * POSIX Threads -- The best way to go if your platform supports them.
  62  *                  Solaris >= 2.5 have POSIX threads, IRIX >= 6.4 reportedly
  63  *                  has them, and many of the free Unixes now have them.
  64  *                  Be sure to use appropriate -mt or -D_REENTRANT type
  65  *                  compile flags when building.
  66  */
  67 #ifdef PTHREADS
  68
  69 _X_EXPORT unsigned long
  70 _glthread_GetID(void)
  71 {
  72     return (unsigned long) pthread_self();
  73 }
  74
  75 void
  76 _glthread_InitTSD(_glthread_TSD * tsd)
  77 {
  78     if (pthread_key_create(&tsd->key, NULL /*free */ ) != 0) {
  79         perror(INIT_TSD_ERROR);
  80         exit(-1);
  81     }
  82     tsd->initMagic = INIT_MAGIC;
  83 }
  84
  85 void *
  86 _glthread_GetTSD(_glthread_TSD * tsd)
  87 {
  88     if (tsd->initMagic != (int) INIT_MAGIC) {
  89         _glthread_InitTSD(tsd);
  90     }
  91     return pthread_getspecific(tsd->key);
  92 }
  93
  94 void
  95 _glthread_SetTSD(_glthread_TSD * tsd, void *ptr)
  96 {
  97     if (tsd->initMagic != (int) INIT_MAGIC) {
  98         _glthread_InitTSD(tsd);
  99     }
 100     if (pthread_setspecific(tsd->key, ptr) != 0) {
 101         perror(SET_TSD_ERROR);
 102         exit(-1);
 103     }
 104 }
 105
 106 #endif                          /* PTHREADS */
 107
 108 /*
 109  * Win32 Threads.  The only available option for Windows 95/NT.
 110  * Be sure that you compile using the Multithreaded runtime, otherwise
 111  * bad things will happen.
 112  */
 113 #ifdef WIN32_THREADS
 114
 115 void
 116 FreeTSD(_glthread_TSD * p)
 117 {
 118     if (p->initMagic == INIT_MAGIC) {
 119         TlsFree(p->key);
 120         p->initMagic = 0;
 121     }
 122 }
 123
 124 void
 125 InsteadOf_exit(int nCode)
 126 {
 127     DWORD dwErr = GetLastError();
 128 }
 129
 130 unsigned long
 131 _glthread_GetID(void)
 132 {
 133     return GetCurrentThreadId();
 134 }
 135
 136 void
 137 _glthread_InitTSD(_glthread_TSD * tsd)
 138 {
 139     tsd->key = TlsAlloc();
 140     if (tsd->key == TLS_OUT_OF_INDEXES) {
 141         perror("Mesa:_glthread_InitTSD");
 142         InsteadOf_exit(-1);
 143     }
 144     tsd->initMagic = INIT_MAGIC;
 145 }
 146
 147 void *
 148 _glthread_GetTSD(_glthread_TSD * tsd)
 149 {
 150     if (tsd->initMagic != INIT_MAGIC) {
 151         _glthread_InitTSD(tsd);
 152     }
 153     return TlsGetValue(tsd->key);
 154 }
 155
 156 void
 157 _glthread_SetTSD(_glthread_TSD * tsd, void *ptr)
 158 {
 159     /* the following code assumes that the _glthread_TSD has been initialized
 160        to zero at creation */
 161     if (tsd->initMagic != INIT_MAGIC) {
 162         _glthread_InitTSD(tsd);
 163     }
 164     if (TlsSetValue(tsd->key, ptr) == 0) {
 165         perror("Mesa:_glthread_SetTSD");
 166         InsteadOf_exit(-1);
 167     }
 168 }
 169
 170 #endif                          /* WIN32_THREADS */
 171
 172 #else                           /* THREADS */
 173
 174 /*
 175  * no-op functions
 176  */
 177
 178 _X_EXPORT unsigned long
 179 _glthread_GetID(void)
 180 {
 181     return 0;
 182 }
 183
 184 void
 185 _glthread_InitTSD(_glthread_TSD * tsd)
 186 {
 187     (void) tsd;
 188 }
 189
 190 void *
 191 _glthread_GetTSD(_glthread_TSD * tsd)
 192 {
 193     (void) tsd;
 194     return NULL;
 195 }
 196
 197 void
 198 _glthread_SetTSD(_glthread_TSD * tsd, void *ptr)
 199 {
 200     (void) tsd;
 201     (void) ptr;
 202 }
 203
 204 #endif                          /* THREADS */