src/mesa/glapi/glthread.h

   1 /* $Id: glthread.h,v 1.7 2000/11/22 07:32:17 joukj 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  * Thread support for gl dispatch.
  30  *
  31  * Initial version by John Stone (j.stone@acm.org) (johns@cs.umr.edu)
  32  *                and Christoph Poliwoda (poliwoda@volumegraphics.com)
  33  * Revised by Keith Whitwell
  34  * Adapted for new gl dispatcher by Brian Paul
  35  *
  36  *
  37  *
  38  * DOCUMENTATION
  39  *
  40  * This thread module exports the following types:
  41  *   _glthread_TSD     Thread-specific data area
  42  *   _glthread_Thread  Thread datatype
  43  *   _glthread_Mutex   Mutual exclusion lock
  44  *
  45  * Macros:
  46  *   _glthread_DECLARE_STATIC_MUTEX(name)   Declare a non-local mutex
  47  *   _glthread_INIT_MUTEX(name)             Initialize a mutex
  48  *   _glthread_LOCK_MUTEX(name)             Lock a mutex
  49  *   _glthread_UNLOCK_MUTEX(name)           Unlock a mutex
  50  *
  51  * Functions:
  52  *   _glthread_GetID(v)      Get integer thread ID
  53  *   _glthread_InitTSD()     Initialize thread-specific data
  54  *   _glthread_GetTSD()      Get thread-specific data
  55  *   _glthread_SetTSD()      Set thread-specific data
  56  *
  57  */
  58
  59 /*
  60  * If this file is accidentally included by a non-threaded build,
  61  * it should not cause the build to fail, or otherwise cause problems.
  62  * In general, it should only be included when needed however.
  63  */
  64
  65 #ifndef GLTHREAD_H
  66 #define GLTHREAD_H
  67
  68
  69 #if defined(PTHREADS) || defined(SOLARIS_THREADS) || defined(WIN32_THREADS) || defined(XTHREADS)
  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_LOCK_MUTEX(name) \
 105    (void) pthread_mutex_lock(&(name))
 106
 107 #define _glthread_UNLOCK_MUTEX(name) \
 108    (void) pthread_mutex_unlock(&(name))
 109
 110 #endif /* PTHREADS */
 111
 112
 113
 114
 115 /*
 116  * Solaris threads. Use only up to Solaris 2.4.
 117  * Solaris 2.5 and higher provide POSIX threads.
 118  * Be sure to compile with -mt on the Solaris compilers, or
 119  * use -D_REENTRANT if using gcc.
 120  */
 121 #ifdef SOLARIS_THREADS
 122 #include <thread.h>
 123
 124 typedef struct {
 125    thread_key_t key;
 126    mutex_t      keylock;
 127    int          initMagic;
 128 } _glthread_TSD;
 129
 130 typedef thread_t _glthread_Thread;
 131
 132 typedef mutex_t _glthread_Mutex;
 133
 134 /* XXX need to really implement mutex-related macros */
 135 #define _glthread_DECLARE_STATIC_MUTEX(name)  static _glthread_Mutex name = 0
 136 #define _glthread_INIT_MUTEX(name)  (void) name
 137 #define _glthread_LOCK_MUTEX(name)  (void) name
 138 #define _glthread_UNLOCK_MUTEX(name)  (void) name
 139
 140 #endif /* SOLARIS_THREADS */
 141
 142
 143
 144
 145 /*
 146  * Windows threads. Should work with Windows NT and 95.
 147  * IMPORTANT: Link with multithreaded runtime library when THREADS are
 148  * used!
 149  */
 150 #ifdef WIN32_THREADS
 151 #include <windows.h>
 152
 153 typedef struct {
 154    DWORD key;
 155    int   initMagic;
 156 } _glthread_TSD;
 157
 158 typedef HANDLE _glthread_Thread;
 159
 160 typedef CRITICAL_SECTION _glthread_Mutex;
 161
 162 /* XXX need to really implement mutex-related macros */
 163 #define _glthread_DECLARE_STATIC_MUTEX(name)  static _glthread_Mutex name = 0
 164 #define _glthread_INIT_MUTEX(name)  (void) name
 165 #define _glthread_LOCK_MUTEX(name)  (void) name
 166 #define _glthread_UNLOCK_MUTEX(name)  (void) name
 167
 168 #endif /* WIN32_THREADS */
 169
 170
 171
 172
 173 /*
 174  * XFree86 has its own thread wrapper, Xthreads.h
 175  * We wrap it again for GL.
 176  */
 177 #ifdef XTHREADS
 178 #include "Xthreads.h"
 179
 180 typedef struct {
 181    xthread_key_t key;
 182    int initMagic;
 183 } _glthread_TSD;
 184
 185 typedef xthread_t _glthread_Thread;
 186
 187 typedef xmutex_rec _glthread_Mutex;
 188
 189 #define _glthread_DECLARE_STATIC_MUTEX(name) \
 190    static _glthread_Mutex name = XMUTEX_INITIALIZER
 191
 192 #define _glthread_INIT_MUTEX(name) \
 193    xmutex_init(&(name))
 194
 195 #define _glthread_LOCK_MUTEX(name) \
 196    (void) xmutex_lock(&(name))
 197
 198 #define _glthread_UNLOCK_MUTEX(name) \
 199    (void) xmutex_unlock(&(name))
 200
 201 #endif /* XTHREADS */
 202
 203
 204
 205
 206 #ifndef THREADS
 207
 208 /*
 209  * THREADS not defined
 210  */
 211
 212 typedef GLuint _glthread_TSD;
 213
 214 typedef GLuint _glthread_Thread;
 215
 216 typedef GLuint _glthread_Mutex;
 217
 218 #define _glthread_DECLARE_STATIC_MUTEX(name)  static _glthread_Mutex name = 0
 219
 220 #define _glthread_INIT_MUTEX(name)  (void) name
 221
 222 #define _glthread_LOCK_MUTEX(name)  (void) name
 223
 224 #define _glthread_UNLOCK_MUTEX(name)  (void) name
 225
 226 #endif /* THREADS */
 227
 228
 229
 230 /*
 231  * Platform independent thread specific data API.
 232  */
 233
 234 extern unsigned long
 235 _glthread_GetID(void);
 236
 237
 238 extern void
 239 _glthread_InitTSD(_glthread_TSD *);
 240
 241
 242 extern void *
 243 _glthread_GetTSD(_glthread_TSD *);
 244
 245
 246 extern void
 247 _glthread_SetTSD(_glthread_TSD *, void *);
 248
 249
 250
 251 #endif /* THREADS_H */
 252