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