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annotate src/thread/riscos/SDL_sysmutex.c @ 955:d74fbf56f2f6

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Date: Fri, 25 Jun 2004 13:29:15 +0100 From: "alan buckley" Subject: Modification for RISC OS version of SDL Ive attached a zip file with the changes to this email, it contains the following: The file sdldiff.txt is the output from cvs diff u. . The directory thread/riscos contains all the new files to support threading. Readme.riscos is a new readme file to add.
author Sam Lantinga <slouken@libsdl.org>
date Fri, 17 Sep 2004 13:20:10 +0000
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children c9b51268668f
rev   line source
955
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Sam Lantinga <slouken@libsdl.org>
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 SAVE_RCSID
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26 static char rcsid =
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27 "@(#) $Id$";
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28 #endif
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29
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30 #ifdef DISABLE_THREADS
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31 #include "../generic/SDL_sysmutex.c"
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32 #else
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33
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34 #include <stdlib.h>
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35 #include <stdio.h>
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36 #include <pthread.h>
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37
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38 #include "SDL_error.h"
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39 #include "SDL_thread.h"
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40
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41 struct SDL_mutex {
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42 pthread_mutex_t id;
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43 #ifdef PTHREAD_NO_RECURSIVE_MUTEX
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44 int recursive;
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45 pthread_t owner;
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46 #endif
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47 };
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48
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49 SDL_mutex *SDL_CreateMutex (void)
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50 {
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51 SDL_mutex *mutex;
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52 pthread_mutexattr_t attr;
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53
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54 /* Allocate the structure */
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55 mutex = (SDL_mutex *)calloc(1, sizeof(*mutex));
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56 if ( mutex ) {
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57 pthread_mutexattr_init(&attr);
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58 #ifdef PTHREAD_NO_RECURSIVE_MUTEX
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59 /* No extra attributes necessary */
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60 #else
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61 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
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62 #endif /* PTHREAD_NO_RECURSIVE_MUTEX */
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63 if ( pthread_mutex_init(&mutex->id, &attr) != 0 ) {
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64 SDL_SetError("pthread_mutex_init() failed");
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65 free(mutex);
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66 mutex = NULL;
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67 }
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68 } else {
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69 SDL_OutOfMemory();
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70 }
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71 return(mutex);
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72 }
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73
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74 void SDL_DestroyMutex(SDL_mutex *mutex)
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75 {
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76 if ( mutex ) {
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77 pthread_mutex_destroy(&mutex->id);
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78 free(mutex);
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79 }
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80 }
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81
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82 /* Lock the mutex */
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83 int SDL_mutexP(SDL_mutex *mutex)
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84 {
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85 int retval;
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86 #ifdef PTHREAD_NO_RECURSIVE_MUTEX
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87 pthread_t this_thread;
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88 #endif
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89
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90 if ( mutex == NULL ) {
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91 SDL_SetError("Passed a NULL mutex");
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92 return -1;
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93 }
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94
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95 retval = 0;
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96 #ifdef PTHREAD_NO_RECURSIVE_MUTEX
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97 this_thread = pthread_self();
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98 if ( mutex->owner == this_thread ) {
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99 ++mutex->recursive;
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100 } else {
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101 /* The order of operations is important.
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102 We set the locking thread id after we obtain the lock
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103 so unlocks from other threads will fail.
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104 */
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105 if ( pthread_mutex_lock(&mutex->id) == 0 ) {
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106 mutex->owner = this_thread;
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107 mutex->recursive = 0;
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108 } else {
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109 SDL_SetError("pthread_mutex_lock() failed");
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110 retval = -1;
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111 }
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112 }
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113 #else
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114 if ( pthread_mutex_lock(&mutex->id) < 0 ) {
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115 SDL_SetError("pthread_mutex_lock() failed");
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116 retval = -1;
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117 }
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118 #endif
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119 return retval;
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120 }
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121
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122 int SDL_mutexV(SDL_mutex *mutex)
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123 {
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124 int retval;
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125
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126 if ( mutex == NULL ) {
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127 SDL_SetError("Passed a NULL mutex");
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128 return -1;
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129 }
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130
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131 retval = 0;
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132 #ifdef PTHREAD_NO_RECURSIVE_MUTEX
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133 /* We can only unlock the mutex if we own it */
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134 if ( pthread_self() == mutex->owner ) {
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135 if ( mutex->recursive ) {
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136 --mutex->recursive;
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137 } else {
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138 /* The order of operations is important.
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139 First reset the owner so another thread doesn't lock
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140 the mutex and set the ownership before we reset it,
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141 then release the lock semaphore.
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142 */
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143 mutex->owner = 0;
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144 pthread_mutex_unlock(&mutex->id);
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145 }
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146 } else {
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147 SDL_SetError("mutex not owned by this thread");
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148 retval = -1;
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149 }
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150
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151 #else
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152 if ( pthread_mutex_unlock(&mutex->id) < 0 ) {
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153 SDL_SetError("pthread_mutex_unlock() failed");
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154 retval = -1;
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155 }
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156 #endif /* PTHREAD_NO_RECURSIVE_MUTEX */
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157
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158 return retval;
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159 }
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160 #endif