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annotate src/thread/riscos/SDL_sysmutex.c @ 1312:c9b51268668f

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Updated copyright information and removed rcs id lines (problematic in branch merges) I batch edited these files, so please let me know if I've accidentally removed anybody's credit here.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 01 Feb 2006 06:32:25 +0000
parents d74fbf56f2f6
children 3692456e7b0f
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 <stdlib.h>
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30 #include <stdio.h>
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31 #include <pthread.h>
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32
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33 #include "SDL_error.h"
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34 #include "SDL_thread.h"
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35
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36 struct SDL_mutex {
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37 pthread_mutex_t id;
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38 #ifdef PTHREAD_NO_RECURSIVE_MUTEX
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39 int recursive;
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40 pthread_t owner;
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41 #endif
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42 };
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43
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44 SDL_mutex *SDL_CreateMutex (void)
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45 {
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46 SDL_mutex *mutex;
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47 pthread_mutexattr_t attr;
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48
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49 /* Allocate the structure */
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50 mutex = (SDL_mutex *)calloc(1, sizeof(*mutex));
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51 if ( mutex ) {
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52 pthread_mutexattr_init(&attr);
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53 #ifdef PTHREAD_NO_RECURSIVE_MUTEX
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54 /* No extra attributes necessary */
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55 #else
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56 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
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57 #endif /* PTHREAD_NO_RECURSIVE_MUTEX */
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58 if ( pthread_mutex_init(&mutex->id, &attr) != 0 ) {
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59 SDL_SetError("pthread_mutex_init() failed");
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60 free(mutex);
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61 mutex = NULL;
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62 }
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63 } else {
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64 SDL_OutOfMemory();
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65 }
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66 return(mutex);
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67 }
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68
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69 void SDL_DestroyMutex(SDL_mutex *mutex)
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70 {
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71 if ( mutex ) {
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72 pthread_mutex_destroy(&mutex->id);
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73 free(mutex);
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74 }
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75 }
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76
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77 /* Lock the mutex */
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78 int SDL_mutexP(SDL_mutex *mutex)
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79 {
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80 int retval;
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81 #ifdef PTHREAD_NO_RECURSIVE_MUTEX
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82 pthread_t this_thread;
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83 #endif
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84
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85 if ( mutex == NULL ) {
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86 SDL_SetError("Passed a NULL mutex");
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87 return -1;
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88 }
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89
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90 retval = 0;
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91 #ifdef PTHREAD_NO_RECURSIVE_MUTEX
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92 this_thread = pthread_self();
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93 if ( mutex->owner == this_thread ) {
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94 ++mutex->recursive;
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95 } else {
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96 /* The order of operations is important.
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97 We set the locking thread id after we obtain the lock
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98 so unlocks from other threads will fail.
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99 */
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100 if ( pthread_mutex_lock(&mutex->id) == 0 ) {
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101 mutex->owner = this_thread;
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102 mutex->recursive = 0;
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103 } else {
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104 SDL_SetError("pthread_mutex_lock() failed");
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105 retval = -1;
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106 }
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107 }
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108 #else
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109 if ( pthread_mutex_lock(&mutex->id) < 0 ) {
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110 SDL_SetError("pthread_mutex_lock() failed");
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111 retval = -1;
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112 }
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113 #endif
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114 return retval;
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115 }
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116
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117 int SDL_mutexV(SDL_mutex *mutex)
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118 {
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119 int retval;
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120
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121 if ( mutex == NULL ) {
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122 SDL_SetError("Passed a NULL mutex");
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123 return -1;
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124 }
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125
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126 retval = 0;
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127 #ifdef PTHREAD_NO_RECURSIVE_MUTEX
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128 /* We can only unlock the mutex if we own it */
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129 if ( pthread_self() == mutex->owner ) {
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130 if ( mutex->recursive ) {
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131 --mutex->recursive;
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132 } else {
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133 /* The order of operations is important.
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134 First reset the owner so another thread doesn't lock
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135 the mutex and set the ownership before we reset it,
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136 then release the lock semaphore.
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137 */
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138 mutex->owner = 0;
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139 pthread_mutex_unlock(&mutex->id);
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140 }
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141 } else {
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142 SDL_SetError("mutex not owned by this thread");
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143 retval = -1;
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144 }
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145
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146 #else
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147 if ( pthread_mutex_unlock(&mutex->id) < 0 ) {
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148 SDL_SetError("pthread_mutex_unlock() failed");
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149 retval = -1;
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150 }
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151 #endif /* PTHREAD_NO_RECURSIVE_MUTEX */
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152
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153 return retval;
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154 }
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155 #endif