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annotate src/thread/riscos/SDL_sysmutex.c @ 1614:6162b8d921ce

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Date: Wed, 29 Mar 2006 17:26:55 +0200 CEST From: "Fran���is Revol" Subject: [SDL] BeOS port fix: PrintScreen key crashing It seems the latest SDL crashes when someone hits the PrtScrn key in ZETA (BeOS R6), somewhere it gets a negative value as key code (or a big unsigned maybe ?), and uses it as an index in the keysym table... I'll investigate the cause for the negative value, but it's always better to check for bounds correctly when indexing a table. The attached diff fixes it. Fran���is Revol -- Software Architect yellowTAB GmbH
author Sam Lantinga <slouken@libsdl.org>
date Fri, 31 Mar 2006 06:16:20 +0000
parents d910939febfa
children 782fd950bd46 c121d94672cb a1b03ba2fcd0
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 #include "SDL_config.h"
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23
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24 /* RISC OS implementations uses pthreads based on linux code */
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25
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26 #include "SDL_thread.h"
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27
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28 #if SDL_THREADS_DISABLED
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29 #include "../generic/SDL_sysmutex.c"
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30 #else
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31
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32 #include <pthread.h>
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33
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34 struct SDL_mutex {
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35 pthread_mutex_t id;
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36 #if SDL_THREAD_PTHREAD_NO_RECURSIVE_MUTEX
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37 int recursive;
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38 pthread_t owner;
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39 #endif
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40 };
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41
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42 SDL_mutex *SDL_CreateMutex (void)
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43 {
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44 SDL_mutex *mutex;
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45 pthread_mutexattr_t attr;
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46
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47 /* Allocate the structure */
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48 mutex = (SDL_mutex *)SDL_calloc(1, sizeof(*mutex));
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49 if ( mutex ) {
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50 pthread_mutexattr_init(&attr);
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51 #if SDL_THREAD_PTHREAD_NO_RECURSIVE_MUTEX
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52 /* No extra attributes necessary */
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53 #else
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54 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
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55 #endif /* SDL_THREAD_PTHREAD_NO_RECURSIVE_MUTEX */
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56 if ( pthread_mutex_init(&mutex->id, &attr) != 0 ) {
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57 SDL_SetError("pthread_mutex_init() failed");
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58 SDL_free(mutex);
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59 mutex = NULL;
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60 }
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61 } else {
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62 SDL_OutOfMemory();
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63 }
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64 return(mutex);
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65 }
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66
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67 void SDL_DestroyMutex(SDL_mutex *mutex)
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68 {
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69 if ( mutex ) {
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70 pthread_mutex_destroy(&mutex->id);
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71 SDL_free(mutex);
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72 }
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73 }
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74
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75 /* Lock the mutex */
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76 int SDL_mutexP(SDL_mutex *mutex)
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77 {
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78 int retval;
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79 #if SDL_THREAD_PTHREAD_NO_RECURSIVE_MUTEX
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80 pthread_t this_thread;
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81 #endif
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82
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83 if ( mutex == NULL ) {
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84 SDL_SetError("Passed a NULL mutex");
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85 return -1;
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86 }
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87
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88 retval = 0;
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89 #if SDL_THREAD_PTHREAD_NO_RECURSIVE_MUTEX
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90 this_thread = pthread_self();
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91 if ( mutex->owner == this_thread ) {
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92 ++mutex->recursive;
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93 } else {
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94 /* The order of operations is important.
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95 We set the locking thread id after we obtain the lock
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96 so unlocks from other threads will fail.
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97 */
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98 if ( pthread_mutex_lock(&mutex->id) == 0 ) {
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99 mutex->owner = this_thread;
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100 mutex->recursive = 0;
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101 } else {
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102 SDL_SetError("pthread_mutex_lock() failed");
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103 retval = -1;
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104 }
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105 }
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106 #else
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107 if ( pthread_mutex_lock(&mutex->id) < 0 ) {
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108 SDL_SetError("pthread_mutex_lock() failed");
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109 retval = -1;
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110 }
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111 #endif
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112 return retval;
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113 }
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114
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115 int SDL_mutexV(SDL_mutex *mutex)
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116 {
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117 int retval;
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118
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119 if ( mutex == NULL ) {
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120 SDL_SetError("Passed a NULL mutex");
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121 return -1;
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122 }
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123
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124 retval = 0;
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125 #if SDL_THREAD_PTHREAD_NO_RECURSIVE_MUTEX
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126 /* We can only unlock the mutex if we own it */
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127 if ( pthread_self() == mutex->owner ) {
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128 if ( mutex->recursive ) {
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129 --mutex->recursive;
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130 } else {
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131 /* The order of operations is important.
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132 First reset the owner so another thread doesn't lock
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133 the mutex and set the ownership before we reset it,
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134 then release the lock semaphore.
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135 */
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136 mutex->owner = 0;
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137 pthread_mutex_unlock(&mutex->id);
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138 }
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139 } else {
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140 SDL_SetError("mutex not owned by this thread");
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141 retval = -1;
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142 }
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143
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144 #else
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145 if ( pthread_mutex_unlock(&mutex->id) < 0 ) {
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146 SDL_SetError("pthread_mutex_unlock() failed");
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147 retval = -1;
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148 }
1361
19418e4422cb New configure-based build system. Still work in progress, but much improved
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149 #endif /* SDL_THREAD_PTHREAD_NO_RECURSIVE_MUTEX */
955
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150
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151 return retval;
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152 }
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153 #endif