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annotate src/thread/pth/SDL_syscond.c @ 1336:3692456e7b0f

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Use SDL_ prefixed versions of C library functions. FIXME: Change #include <stdlib.h> to #include "SDL_stdlib.h" Change #include <string.h> to #include "SDL_string.h" Make sure nothing else broke because of this...
author Sam Lantinga <slouken@libsdl.org>
date Tue, 07 Feb 2006 06:59:48 +0000
parents 1d74ddc90cb2
children 604d73db6802
rev   line source
329
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1 /*
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2 * GNU pth conditions variables
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3 *
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4 * Patrice Mandin
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5 */
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6
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7 #include <stdio.h>
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8 #include <stdlib.h>
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9 #include <pth.h>
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10
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11 #include "SDL_error.h"
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12 #include "SDL_thread.h"
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13 #include "SDL_syscond_c.h"
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14 #include "SDL_sysmutex_c.h"
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15
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16 /* Create a condition variable */
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17 SDL_cond * SDL_CreateCond(void)
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18 {
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19 SDL_cond *cond;
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20
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21 cond = (SDL_cond *) SDL_malloc(sizeof(SDL_cond));
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22 if ( cond ) {
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23 if ( pth_cond_init(&(cond->condpth_p)) < 0 ) {
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24 SDL_SetError("pthread_cond_init() failed");
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25 SDL_free(cond);
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26 cond = NULL;
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27 }
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28 } else {
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29 SDL_OutOfMemory();
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30 }
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31 return(cond);
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32 }
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33
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34 /* Destroy a condition variable */
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35 void SDL_DestroyCond(SDL_cond *cond)
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36 {
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37 if ( cond ) {
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38 SDL_free(cond);
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39 }
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40 }
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41
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42 /* Restart one of the threads that are waiting on the condition variable */
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43 int SDL_CondSignal(SDL_cond *cond)
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44 {
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45 int retval;
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46
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47 if ( ! cond ) {
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48 SDL_SetError("Passed a NULL condition variable");
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49 return -1;
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50 }
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51
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52 retval = 0;
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53 if ( pth_cond_notify(&(cond->condpth_p), FALSE) != 0 ) {
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54 SDL_SetError("pth_cond_notify() failed");
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55 retval = -1;
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56 }
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57 return retval;
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58 }
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59
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60 /* Restart all threads that are waiting on the condition variable */
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61 int SDL_CondBroadcast(SDL_cond *cond)
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62 {
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63 int retval;
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64
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65 if ( ! cond ) {
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66 SDL_SetError("Passed a NULL condition variable");
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67 return -1;
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68 }
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69
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70 retval = 0;
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71 if ( pth_cond_notify(&(cond->condpth_p), TRUE) != 0 ) {
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72 SDL_SetError("pth_cond_notify() failed");
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73 retval = -1;
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74 }
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75 return retval;
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76 }
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77
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78 /* Wait on the condition variable for at most 'ms' milliseconds.
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79 The mutex must be locked before entering this function!
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80 The mutex is unlocked during the wait, and locked again after the wait.
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81
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82 Typical use:
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83
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84 Thread A:
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85 SDL_LockMutex(lock);
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86 while ( ! condition ) {
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87 SDL_CondWait(cond);
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88 }
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89 SDL_UnlockMutex(lock);
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90
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91 Thread B:
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92 SDL_LockMutex(lock);
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93 ...
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94 condition = true;
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95 ...
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96 SDL_UnlockMutex(lock);
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97 */
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98 int SDL_CondWaitTimeout(SDL_cond *cond, SDL_mutex *mutex, Uint32 ms)
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99 {
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100 int retval;
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101 pth_event_t ev;
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102 int sec;
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103
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104 if ( ! cond ) {
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105 SDL_SetError("Passed a NULL condition variable");
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106 return -1;
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107 }
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108
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109 retval = 0;
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110
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111 sec = ms/1000;
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112 ev = pth_event(PTH_EVENT_TIME, pth_timeout(sec,(ms-sec*1000)*1000));
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113
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114 if ( pth_cond_await(&(cond->condpth_p), &(mutex->mutexpth_p), ev) != 0 ) {
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115 SDL_SetError("pth_cond_await() failed");
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116 retval = -1;
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117 }
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118
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119 pth_event_free(ev, PTH_FREE_ALL);
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120
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121 return retval;
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122 }
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123
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124 /* Wait on the condition variable forever */
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125 int SDL_CondWait(SDL_cond *cond, SDL_mutex *mutex)
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126 {
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127 int retval;
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128
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129 if ( ! cond ) {
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130 SDL_SetError("Passed a NULL condition variable");
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131 return -1;
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132 }
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133
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134 retval = 0;
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135 if ( pth_cond_await(&(cond->condpth_p), &(mutex->mutexpth_p), NULL) != 0 ) {
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136 SDL_SetError("pth_cond_await() failed");
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137 retval = -1;
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138 }
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139 return retval;
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140 }