src/mapi/mapi/u_thread.h

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5.2
   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  * Thread support for gl dispatch.
  28  *
  29  * Initial version by John Stone (j.stone@acm.org) (johns@cs.umr.edu)
  30  *                and Christoph Poliwoda (poliwoda@volumegraphics.com)
  31  * Revised by Keith Whitwell
  32  * Adapted for new gl dispatcher by Brian Paul
  33  * Modified for use in mapi by Chia-I Wu
  34  */
  35
  36 /*
  37  * If this file is accidentally included by a non-threaded build,
  38  * it should not cause the build to fail, or otherwise cause problems.
  39  * In general, it should only be included when needed however.
  40  */
  41
  42 #ifndef _U_THREAD_H_
  43 #define _U_THREAD_H_
  44
  45 #include "u_compiler.h"
  46
  47 #if defined(PTHREADS) || defined(WIN32) || defined(BEOS_THREADS)
  48 #ifndef THREADS
  49 #define THREADS
  50 #endif
  51 #endif
  52
  53 /*
  54  * POSIX threads. This should be your choice in the Unix world
  55  * whenever possible.  When building with POSIX threads, be sure
  56  * to enable any compiler flags which will cause the MT-safe
  57  * libc (if one exists) to be used when linking, as well as any
  58  * header macros for MT-safe errno, etc.  For Solaris, this is the -mt
  59  * compiler flag.  On Solaris with gcc, use -D_REENTRANT to enable
  60  * proper compiling for MT-safe libc etc.
  61  */
  62 #if defined(PTHREADS)
  63 #include <pthread.h> /* POSIX threads headers */
  64
  65 struct u_tsd {
  66    pthread_key_t key;
  67    int initMagic;
  68 };
  69
  70 typedef pthread_mutex_t u_mutex;
  71
  72 #define u_mutex_declare_static(name) \
  73    static u_mutex name = PTHREAD_MUTEX_INITIALIZER
  74
  75 #define u_mutex_init(name)    pthread_mutex_init(&(name), NULL)
  76 #define u_mutex_destroy(name) pthread_mutex_destroy(&(name))
  77 #define u_mutex_lock(name)    (void) pthread_mutex_lock(&(name))
  78 #define u_mutex_unlock(name)  (void) pthread_mutex_unlock(&(name))
  79
  80 #endif /* PTHREADS */
  81
  82
  83 /*
  84  * Windows threads. Should work with Windows NT and 95.
  85  * IMPORTANT: Link with multithreaded runtime library when THREADS are
  86  * used!
  87  */
  88 #ifdef WIN32
  89 #include <windows.h>
  90
  91 struct u_tsd {
  92    DWORD key;
  93    int   initMagic;
  94 };
  95
  96 typedef CRITICAL_SECTION u_mutex;
  97
  98 /* http://locklessinc.com/articles/pthreads_on_windows/ */
  99 #define u_mutex_declare_static(name) \
 100    /* static */ u_mutex name = {(void*)-1, -1, 0, 0, 0, 0}
 101
 102 #define u_mutex_init(name)    InitializeCriticalSection(&name)
 103 #define u_mutex_destroy(name) DeleteCriticalSection(&name)
 104 #define u_mutex_lock(name)    EnterCriticalSection(&name)
 105 #define u_mutex_unlock(name)  LeaveCriticalSection(&name)
 106
 107 #endif /* WIN32 */
 108
 109
 110 /*
 111  * BeOS threads. R5.x required.
 112  */
 113 #ifdef BEOS_THREADS
 114
 115 /* Problem with OS.h and this file on haiku */
 116 #ifndef __HAIKU__
 117 #include <kernel/OS.h>
 118 #endif
 119
 120 #include <support/TLS.h>
 121
 122 /* The only two typedefs required here
 123  * this is cause of the OS.h problem
 124  */
 125 #ifdef __HAIKU__
 126 typedef int32 thread_id;
 127 typedef int32 sem_id;
 128 #endif
 129
 130 struct u_tsd {
 131    int32        key;
 132    int          initMagic;
 133 };
 134
 135 /* Use Benaphore, aka speeder semaphore */
 136 typedef struct {
 137     int32   lock;
 138     sem_id  sem;
 139 } benaphore;
 140 typedef benaphore u_mutex;
 141
 142 #define u_mutex_declare_static(name) \
 143    static u_mutex name = { 0, 0 }
 144
 145 #define u_mutex_init(name) \
 146    name.sem = create_sem(0, #name"_benaphore"), \
 147    name.lock = 0
 148
 149 #define u_mutex_destroy(name) \
 150    delete_sem(name.sem), \
 151    name.lock = 0
 152
 153 #define u_mutex_lock(name) \
 154    if (name.sem == 0) \
 155       u_mutex_init(name); \
 156    if (atomic_add(&(name.lock), 1) >= 1) \
 157       acquire_sem(name.sem)
 158
 159 #define u_mutex_unlock(name) \
 160    if (atomic_add(&(name.lock), -1) > 1) \
 161       release_sem(name.sem)
 162
 163 #endif /* BEOS_THREADS */
 164
 165
 166 /*
 167  * THREADS not defined
 168  */
 169 #ifndef THREADS
 170
 171 struct u_tsd {
 172    int initMagic;
 173 };
 174
 175 typedef unsigned u_mutex;
 176
 177 #define u_mutex_declare_static(name)   static u_mutex name = 0
 178 #define u_mutex_init(name)             (void) name
 179 #define u_mutex_destroy(name)          (void) name
 180 #define u_mutex_lock(name)             (void) name
 181 #define u_mutex_unlock(name)           (void) name
 182
 183 #endif /* THREADS */
 184
 185
 186 unsigned long
 187 u_thread_self(void);
 188
 189 void
 190 u_tsd_init(struct u_tsd *tsd);
 191
 192 void
 193 u_tsd_destroy(struct u_tsd *tsd); /* WIN32 only */
 194
 195 void *
 196 u_tsd_get(struct u_tsd *tsd);
 197
 198 void
 199 u_tsd_set(struct u_tsd *tsd, void *ptr);
 200
 201 #endif /* _U_THREAD_H_ */