Mercurial > sdl-ios-xcode

annotate src/thread/pthread/SDL_sysmutex.c @ 4355:9b464226e541 SDL-1.2

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Fixed bug #855 Ludwig Nussel 2009-10-18 06:31:52 PDT an mprotect call was added to fix bug 528. However that results in a buffer that allows writing and code execution. Ie the no-execute security features of modern operating systems are defeated this way. Two mprotect calls are needed. One to make the buffer executable but not writeable when done and another one to make the buffer writeable again if the content needs to be changed.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 18 Oct 2009 17:31:37 +0000
parents a1b03ba2fcd0
children
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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 #include <pthread.h>
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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_THREAD_PTHREAD_RECURSIVE_MUTEX && \
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29 !SDL_THREAD_PTHREAD_RECURSIVE_MUTEX_NP
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30 #define FAKE_RECURSIVE_MUTEX
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31 #endif
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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 #if FAKE_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 #if SDL_THREAD_PTHREAD_RECURSIVE_MUTEX
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51 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
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52 #elif SDL_THREAD_PTHREAD_RECURSIVE_MUTEX_NP
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53 pthread_mutexattr_setkind_np(&attr, PTHREAD_MUTEX_RECURSIVE_NP);
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54 #else
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55 /* No extra attributes necessary */
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56 #endif
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57 if ( pthread_mutex_init(&mutex->id, &attr) != 0 ) {
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58 SDL_SetError("pthread_mutex_init() failed");
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59 SDL_free(mutex);
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60 mutex = NULL;
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61 }
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62 } else {
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63 SDL_OutOfMemory();
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64 }
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65 return(mutex);
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66 }
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67
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68 void SDL_DestroyMutex(SDL_mutex *mutex)
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69 {
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70 if ( mutex ) {
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71 pthread_mutex_destroy(&mutex->id);
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72 SDL_free(mutex);
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73 }
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74 }
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75
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76 /* Lock the mutex */
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77 int SDL_mutexP(SDL_mutex *mutex)
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78 {
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79 int retval;
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80 #if FAKE_RECURSIVE_MUTEX
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81 pthread_t this_thread;
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82 #endif
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83
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84 if ( mutex == NULL ) {
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85 SDL_SetError("Passed a NULL mutex");
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86 return -1;
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87 }
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88
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89 retval = 0;
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90 #if FAKE_RECURSIVE_MUTEX
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91 this_thread = pthread_self();
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92 if ( mutex->owner == this_thread ) {
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93 ++mutex->recursive;
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94 } else {
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95 /* The order of operations is important.
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96 We set the locking thread id after we obtain the lock
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97 so unlocks from other threads will fail.
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98 */
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99 if ( pthread_mutex_lock(&mutex->id) == 0 ) {
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100 mutex->owner = this_thread;
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101 mutex->recursive = 0;
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102 } else {
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103 SDL_SetError("pthread_mutex_lock() failed");
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104 retval = -1;
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105 }
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106 }
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107 #else
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108 if ( pthread_mutex_lock(&mutex->id) < 0 ) {
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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 #endif
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113 return retval;
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114 }
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115
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116 int SDL_mutexV(SDL_mutex *mutex)
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117 {
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118 int retval;
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119
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120 if ( mutex == NULL ) {
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121 SDL_SetError("Passed a NULL mutex");
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122 return -1;
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123 }
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124
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125 retval = 0;
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126 #if FAKE_RECURSIVE_MUTEX
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127 /* We can only unlock the mutex if we own it */
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128 if ( pthread_self() == mutex->owner ) {
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129 if ( mutex->recursive ) {
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130 --mutex->recursive;
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131 } else {
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132 /* The order of operations is important.
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133 First reset the owner so another thread doesn't lock
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134 the mutex and set the ownership before we reset it,
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135 then release the lock semaphore.
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136 */
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137 mutex->owner = 0;
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138 pthread_mutex_unlock(&mutex->id);
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139 }
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140 } else {
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141 SDL_SetError("mutex not owned by this thread");
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142 retval = -1;
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143 }
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144
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145 #else
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146 if ( pthread_mutex_unlock(&mutex->id) < 0 ) {
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147 SDL_SetError("pthread_mutex_unlock() failed");
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148 retval = -1;
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149 }
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150 #endif /* FAKE_RECURSIVE_MUTEX */
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151
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152 return retval;
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153 }