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annotate src/thread/generic/SDL_sysmutex.c @ 1895:c121d94672cb

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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 10 Jul 2006 21:04:37 +0000
parents d910939febfa
children 99210400e8b9
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 /* An implementation of mutexes using semaphores */
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25
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26 #include "SDL_thread.h"
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27 #include "SDL_systhread_c.h"
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28
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29
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30 struct SDL_mutex
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31 {
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32 int recursive;
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33 Uint32 owner;
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34 SDL_sem *sem;
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35 };
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36
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37 /* Create a mutex */
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38 SDL_mutex *
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39 SDL_CreateMutex(void)
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40 {
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41 SDL_mutex *mutex;
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42
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43 /* Allocate mutex memory */
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44 mutex = (SDL_mutex *) SDL_malloc(sizeof(*mutex));
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45 if (mutex) {
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46 /* Create the mutex semaphore, with initial value 1 */
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47 mutex->sem = SDL_CreateSemaphore(1);
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48 mutex->recursive = 0;
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49 mutex->owner = 0;
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50 if (!mutex->sem) {
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51 SDL_free(mutex);
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52 mutex = NULL;
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53 }
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54 } else {
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55 SDL_OutOfMemory();
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56 }
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57 return mutex;
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58 }
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59
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60 /* Free the mutex */
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61 void
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62 SDL_DestroyMutex(SDL_mutex * mutex)
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63 {
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64 if (mutex) {
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65 if (mutex->sem) {
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66 SDL_DestroySemaphore(mutex->sem);
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67 }
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68 SDL_free(mutex);
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69 }
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70 }
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71
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72 /* Lock the semaphore */
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73 int
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74 SDL_mutexP(SDL_mutex * mutex)
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75 {
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76 #if SDL_THREADS_DISABLED
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77 return 0;
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78 #else
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79 Uint32 this_thread;
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80
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81 if (mutex == NULL) {
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82 SDL_SetError("Passed a NULL mutex");
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83 return -1;
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84 }
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85
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86 this_thread = SDL_ThreadID();
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87 if (mutex->owner == this_thread) {
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88 ++mutex->recursive;
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89 } else {
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90 /* The order of operations is important.
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91 We set the locking thread id after we obtain the lock
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92 so unlocks from other threads will fail.
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93 */
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94 SDL_SemWait(mutex->sem);
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95 mutex->owner = this_thread;
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96 mutex->recursive = 0;
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97 }
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98
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99 return 0;
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100 #endif /* SDL_THREADS_DISABLED */
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101 }
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102
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103 /* Unlock the mutex */
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104 int
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105 SDL_mutexV(SDL_mutex * mutex)
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106 {
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107 #if SDL_THREADS_DISABLED
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108 return 0;
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109 #else
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110 if (mutex == NULL) {
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111 SDL_SetError("Passed a NULL mutex");
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112 return -1;
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113 }
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114
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115 /* If we don't own the mutex, we can't unlock it */
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116 if (SDL_ThreadID() != mutex->owner) {
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117 SDL_SetError("mutex not owned by this thread");
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118 return -1;
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119 }
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120
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121 if (mutex->recursive) {
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122 --mutex->recursive;
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123 } else {
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124 /* The order of operations is important.
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125 First reset the owner so another thread doesn't lock
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126 the mutex and set the ownership before we reset it,
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127 then release the lock semaphore.
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128 */
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129 mutex->owner = 0;
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130 SDL_SemPost(mutex->sem);
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131 }
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132 return 0;
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133 #endif /* SDL_THREADS_DISABLED */
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134 }
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135
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136 /* vi: set ts=4 sw=4 expandtab: */