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annotate src/thread/pth/SDL_syscond.c @ 1356:67114343400d

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author Sam Lantinga <slouken@libsdl.org>
date Fri, 10 Feb 2006 03:19:02 +0000
parents 604d73db6802
children c71e05b4dc2e
rev   line source
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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 <pth.h>
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8
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9 #include "SDL_stdlib.h"
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10 #include "SDL_error.h"
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11 #include "SDL_thread.h"
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12 #include "SDL_syscond_c.h"
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13 #include "SDL_sysmutex_c.h"
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14
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15 /* Create a condition variable */
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16 SDL_cond * SDL_CreateCond(void)
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17 {
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18 SDL_cond *cond;
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19
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20 cond = (SDL_cond *) SDL_malloc(sizeof(SDL_cond));
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21 if ( cond ) {
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22 if ( pth_cond_init(&(cond->condpth_p)) < 0 ) {
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23 SDL_SetError("pthread_cond_init() failed");
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24 SDL_free(cond);
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25 cond = NULL;
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26 }
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27 } else {
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28 SDL_OutOfMemory();
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29 }
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30 return(cond);
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31 }
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32
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33 /* Destroy a condition variable */
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34 void SDL_DestroyCond(SDL_cond *cond)
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35 {
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36 if ( cond ) {
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37 SDL_free(cond);
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38 }
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39 }
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40
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41 /* Restart one of the threads that are waiting on the condition variable */
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42 int SDL_CondSignal(SDL_cond *cond)
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43 {
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44 int retval;
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45
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46 if ( ! cond ) {
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47 SDL_SetError("Passed a NULL condition variable");
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48 return -1;
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49 }
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50
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51 retval = 0;
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52 if ( pth_cond_notify(&(cond->condpth_p), FALSE) != 0 ) {
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53 SDL_SetError("pth_cond_notify() failed");
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54 retval = -1;
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55 }
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56 return retval;
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57 }
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58
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59 /* Restart all threads that are waiting on the condition variable */
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60 int SDL_CondBroadcast(SDL_cond *cond)
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61 {
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62 int retval;
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63
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64 if ( ! cond ) {
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65 SDL_SetError("Passed a NULL condition variable");
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66 return -1;
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67 }
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68
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69 retval = 0;
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70 if ( pth_cond_notify(&(cond->condpth_p), TRUE) != 0 ) {
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71 SDL_SetError("pth_cond_notify() failed");
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72 retval = -1;
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73 }
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74 return retval;
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75 }
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76
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77 /* Wait on the condition variable for at most 'ms' milliseconds.
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78 The mutex must be locked before entering this function!
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79 The mutex is unlocked during the wait, and locked again after the wait.
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80
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81 Typical use:
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82
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83 Thread A:
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84 SDL_LockMutex(lock);
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85 while ( ! condition ) {
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86 SDL_CondWait(cond);
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87 }
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88 SDL_UnlockMutex(lock);
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89
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90 Thread B:
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91 SDL_LockMutex(lock);
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92 ...
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93 condition = true;
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94 ...
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95 SDL_UnlockMutex(lock);
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96 */
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97 int SDL_CondWaitTimeout(SDL_cond *cond, SDL_mutex *mutex, Uint32 ms)
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98 {
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99 int retval;
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100 pth_event_t ev;
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101 int sec;
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102
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103 if ( ! cond ) {
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104 SDL_SetError("Passed a NULL condition variable");
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105 return -1;
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106 }
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107
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108 retval = 0;
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109
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110 sec = ms/1000;
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111 ev = pth_event(PTH_EVENT_TIME, pth_timeout(sec,(ms-sec*1000)*1000));
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112
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113 if ( pth_cond_await(&(cond->condpth_p), &(mutex->mutexpth_p), ev) != 0 ) {
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114 SDL_SetError("pth_cond_await() failed");
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115 retval = -1;
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116 }
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117
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118 pth_event_free(ev, PTH_FREE_ALL);
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119
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120 return retval;
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121 }
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122
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123 /* Wait on the condition variable forever */
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124 int SDL_CondWait(SDL_cond *cond, SDL_mutex *mutex)
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125 {
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126 int retval;
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127
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128 if ( ! cond ) {
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129 SDL_SetError("Passed a NULL condition variable");
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130 return -1;
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131 }
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132
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133 retval = 0;
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134 if ( pth_cond_await(&(cond->condpth_p), &(mutex->mutexpth_p), NULL) != 0 ) {
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135 SDL_SetError("pth_cond_await() failed");
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136 retval = -1;
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137 }
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138 return retval;
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139 }