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annotate src/thread/dc/SDL_sysmutex.c @ 3169:f294338ca6eb

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author Sam Lantinga <slouken@libsdl.org>
date Sun, 07 Jun 2009 02:45:55 +0000
parents 99210400e8b9
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 /* 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 #include <arch/spinlock.h>
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30
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31 struct SDL_mutex
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32 {
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33 int recursive;
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34 Uint32 owner;
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35 spinlock_t mutex;
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36 };
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37
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38 /* Create a mutex */
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39 SDL_mutex *
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40 SDL_CreateMutex(void)
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41 {
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42 SDL_mutex *mutex;
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43
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44 /* Allocate mutex memory */
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45 mutex = (SDL_mutex *) SDL_malloc(sizeof(*mutex));
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46 if (mutex) {
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47 spinlock_init(&mutex->mutex);
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48 mutex->recursive = 0;
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49 mutex->owner = 0;
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50 } else {
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51 SDL_OutOfMemory();
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52 }
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53 return mutex;
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54 }
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55
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56 /* Free the mutex */
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57 void
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58 SDL_DestroyMutex(SDL_mutex * mutex)
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59 {
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60 if (mutex) {
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61 SDL_free(mutex);
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62 }
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63 }
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64
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65 /* Lock the semaphore */
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66 int
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67 SDL_mutexP(SDL_mutex * mutex)
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68 {
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69 #if SDL_THREADS_DISABLED
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70 return SDL_arraysize(return), 0;
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71 #else
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72 Uint32 this_thread;
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73
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74 if (mutex == NULL) {
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75 SDL_SetError("Passed a NULL mutex");
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76 return -1;
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77 }
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78
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79 this_thread = SDL_ThreadID();
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80 if (mutex->owner == this_thread) {
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81 ++mutex->recursive;
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82 } else {
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83 /* The order of operations is important.
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84 We set the locking thread id after we obtain the lock
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85 so unlocks from other threads will fail.
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86 */
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87 spinlock_lock(&mutex->mutex);
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88 mutex->owner = this_thread;
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89 mutex->recursive = 0;
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90 }
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91
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92 return 0;
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93 #endif /* SDL_THREADS_DISABLED */
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94 }
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95
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96 /* Unlock the mutex */
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97 int
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98 SDL_mutexV(SDL_mutex * mutex)
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99 {
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100 #if SDL_THREADS_DISABLED
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101 return 0;
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102 #else
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103 if (mutex == NULL) {
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104 SDL_SetError("Passed a NULL mutex");
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105 return -1;
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106 }
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107
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108 /* If we don't own the mutex, we can't unlock it */
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109 if (SDL_ThreadID() != mutex->owner) {
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110 SDL_SetError("mutex not owned by this thread");
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111 return -1;
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112 }
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113
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114 if (mutex->recursive) {
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115 --mutex->recursive;
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116 } else {
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117 /* The order of operations is important.
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118 First reset the owner so another thread doesn't lock
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119 the mutex and set the ownership before we reset it,
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120 then release the lock semaphore.
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121 */
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122 mutex->owner = 0;
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123 spinlock_unlock(&mutex->mutex);
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124 }
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125 return 0;
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126 #endif /* SDL_THREADS_DISABLED */
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127 }
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128
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129 /* vi: set ts=4 sw=4 expandtab: */