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annotate src/thread/riscos/SDL_sysmutex.c @ 1358:c71e05b4dc2e

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More header massaging... works great on Windows. ;-)
author Sam Lantinga <slouken@libsdl.org>
date Fri, 10 Feb 2006 06:48:43 +0000
parents 604d73db6802
children 19418e4422cb
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 /* RISC OS implementations uses pthreads based on linux code */
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24
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25 #ifdef DISABLE_THREADS
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26 #include "../generic/SDL_sysmutex.c"
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27 #else
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28
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29 #include <pthread.h>
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30
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31 #include "SDL_thread.h"
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32
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33 struct SDL_mutex {
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34 pthread_mutex_t id;
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35 #ifdef PTHREAD_NO_RECURSIVE_MUTEX
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36 int recursive;
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37 pthread_t owner;
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38 #endif
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39 };
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40
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41 SDL_mutex *SDL_CreateMutex (void)
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42 {
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43 SDL_mutex *mutex;
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44 pthread_mutexattr_t attr;
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45
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46 /* Allocate the structure */
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47 mutex = (SDL_mutex *)SDL_calloc(1, sizeof(*mutex));
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48 if ( mutex ) {
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49 pthread_mutexattr_init(&attr);
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50 #ifdef PTHREAD_NO_RECURSIVE_MUTEX
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51 /* No extra attributes necessary */
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52 #else
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53 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
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54 #endif /* PTHREAD_NO_RECURSIVE_MUTEX */
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55 if ( pthread_mutex_init(&mutex->id, &attr) != 0 ) {
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56 SDL_SetError("pthread_mutex_init() failed");
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57 SDL_free(mutex);
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58 mutex = NULL;
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59 }
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60 } else {
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61 SDL_OutOfMemory();
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62 }
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63 return(mutex);
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64 }
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65
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66 void SDL_DestroyMutex(SDL_mutex *mutex)
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67 {
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68 if ( mutex ) {
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69 pthread_mutex_destroy(&mutex->id);
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70 SDL_free(mutex);
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71 }
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72 }
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73
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74 /* Lock the mutex */
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75 int SDL_mutexP(SDL_mutex *mutex)
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76 {
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77 int retval;
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78 #ifdef PTHREAD_NO_RECURSIVE_MUTEX
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79 pthread_t this_thread;
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80 #endif
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81
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82 if ( mutex == NULL ) {
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83 SDL_SetError("Passed a NULL mutex");
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84 return -1;
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85 }
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86
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87 retval = 0;
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88 #ifdef PTHREAD_NO_RECURSIVE_MUTEX
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89 this_thread = pthread_self();
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90 if ( mutex->owner == this_thread ) {
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91 ++mutex->recursive;
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92 } else {
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93 /* The order of operations is important.
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94 We set the locking thread id after we obtain the lock
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95 so unlocks from other threads will fail.
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96 */
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97 if ( pthread_mutex_lock(&mutex->id) == 0 ) {
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98 mutex->owner = this_thread;
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99 mutex->recursive = 0;
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100 } else {
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101 SDL_SetError("pthread_mutex_lock() failed");
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102 retval = -1;
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103 }
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104 }
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105 #else
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106 if ( pthread_mutex_lock(&mutex->id) < 0 ) {
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107 SDL_SetError("pthread_mutex_lock() failed");
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108 retval = -1;
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109 }
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110 #endif
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111 return retval;
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112 }
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113
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114 int SDL_mutexV(SDL_mutex *mutex)
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115 {
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116 int retval;
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117
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118 if ( mutex == NULL ) {
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119 SDL_SetError("Passed a NULL mutex");
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120 return -1;
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121 }
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122
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123 retval = 0;
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124 #ifdef PTHREAD_NO_RECURSIVE_MUTEX
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125 /* We can only unlock the mutex if we own it */
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126 if ( pthread_self() == mutex->owner ) {
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127 if ( mutex->recursive ) {
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128 --mutex->recursive;
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129 } else {
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130 /* The order of operations is important.
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131 First reset the owner so another thread doesn't lock
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132 the mutex and set the ownership before we reset it,
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133 then release the lock semaphore.
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134 */
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135 mutex->owner = 0;
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136 pthread_mutex_unlock(&mutex->id);
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137 }
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138 } else {
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139 SDL_SetError("mutex not owned by this thread");
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140 retval = -1;
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141 }
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142
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143 #else
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144 if ( pthread_mutex_unlock(&mutex->id) < 0 ) {
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145 SDL_SetError("pthread_mutex_unlock() failed");
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146 retval = -1;
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147 }
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148 #endif /* PTHREAD_NO_RECURSIVE_MUTEX */
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149
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150 return retval;
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151 }
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152 #endif