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annotate src/thread/nds/SDL_sysmutex.c @ 2671:c3e7c0698cbb gsoc2008_nds

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some changes to the dummy driver for debug purposes that should be reverted. most importantly, commenting out a check for an env. var.
author Darren Alton <dalton@stevens.edu>
date Thu, 12 Jun 2008 02:38:49 +0000
parents 6e4669f4db49
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, 1998, 1999, 2000, 2001 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@devolution.com
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id: SDL_sysmutex.c,v 1.2 2001/04/26 16:50:18 hercules Exp $";
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26 #endif
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27
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28 /* An implementation of mutexes using semaphores */
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29
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30 #include <stdio.h>
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31 #include <stdlib.h>
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32
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33 #include "SDL_error.h"
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34 #include "SDL_thread.h"
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35 #include "SDL_systhread_c.h"
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36
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37
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38 struct SDL_mutex
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39 {
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40 int recursive;
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41 Uint32 owner;
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42 SDL_sem *sem;
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43 };
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44
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45 /* Create a mutex */
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46 SDL_mutex *
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47 SDL_CreateMutex(void)
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48 {
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49 SDL_mutex *mutex;
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50
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51 /* Allocate mutex memory */
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52 mutex = (SDL_mutex *) malloc(sizeof(*mutex));
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53 if (mutex) {
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54 /* Create the mutex semaphore, with initial value 1 */
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55 mutex->sem = SDL_CreateSemaphore(1);
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56 mutex->recursive = 0;
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57 mutex->owner = 0;
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58 if (!mutex->sem) {
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59 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 /* Free the mutex */
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69 void
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70 SDL_DestroyMutex(SDL_mutex * mutex)
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71 {
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72 if (mutex) {
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73 if (mutex->sem) {
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74 SDL_DestroySemaphore(mutex->sem);
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75 }
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76 free(mutex);
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77 }
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78 }
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79
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80 /* Lock the semaphore */
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81 int
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82 SDL_mutexP(SDL_mutex * mutex)
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83 {
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84 #ifdef DISABLE_THREADS
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85 return 0;
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86 #else
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87 Uint32 this_thread;
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88
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89 if (mutex == NULL) {
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90 SDL_SetError("Passed a NULL mutex");
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91 return -1;
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92 }
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93
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94 this_thread = SDL_ThreadID();
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95 if (mutex->owner == this_thread) {
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96 ++mutex->recursive;
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97 } else {
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98 /* The order of operations is important.
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99 We set the locking thread id after we obtain the lock
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100 so unlocks from other threads will fail.
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101 */
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102 SDL_SemWait(mutex->sem);
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103 mutex->owner = this_thread;
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104 mutex->recursive = 0;
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105 }
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106
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107 return 0;
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108 #endif /* DISABLE_THREADS */
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109 }
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110
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111 /* Unlock the mutex */
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112 int
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113 SDL_mutexV(SDL_mutex * mutex)
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114 {
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115 #ifdef DISABLE_THREADS
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116 return 0;
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117 #else
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118 if (mutex == NULL) {
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119 SDL_SetError("Passed a NULL mutex");
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120 return -1;
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121 }
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122
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123 /* If we don't own the mutex, we can't unlock it */
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124 if (SDL_ThreadID() != mutex->owner) {
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125 SDL_SetError("mutex not owned by this thread");
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126 return -1;
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127 }
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128
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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 SDL_SemPost(mutex->sem);
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139 }
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140 return 0;
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141 #endif /* DISABLE_THREADS */
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142 }