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annotate src/thread/pth/SDL_syscond.c @ 1143:71a2648acc75

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Replaced Mac OS X's C++ cdrom code with almost-direct translation to C. Sam requested this effort on the mailing list, apparently because of binary compatibility issues between 10.4 and earlier systems (or gcc4 and earlier compilers?). Works fine with SDL12/test/testcdrom.c, with this command line: ./testcdrom -status -list -play -sleep 5000 -pause -sleep 3000 -resume \ -sleep 5000 -stop -sleep 3000 -play -sleep 3000 -stop \ -sleep 3000 -eject Unix Makefiles work, XCode project still need updating for new filenames.
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 22 Sep 2005 08:48:16 +0000
parents 1d74ddc90cb2
children 3692456e7b0f
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 *) 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 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 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 }