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annotate src/thread/generic/SDL_sysmutex.c @ 3294:470d0a416aa7

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Fixed bug #714 fuzzyTew@gmail.com 2009-03-14 15:18:45 PDT patch to change HAVE_ICONV to HAVE_ICONV_H There are two separate iconv checks in configure -- one for the header file and one for the library. include/SDL_stdinc.h uses the library define to see whether or not it should reference the types defined in the header, which naturally breaks if the library exists and the header does not.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 21 Sep 2009 11:04:01 +0000
parents 99210400e8b9
children 0d1b16ee0bca
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 /* 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
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
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