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annotate src/thread/pth/SDL_syscond.c @ 1358:c71e05b4dc2e

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More header massaging... works great on Windows. ;-)
author Sam Lantinga <slouken@libsdl.org>
date Fri, 10 Feb 2006 06:48:43 +0000
parents 604d73db6802
children 19418e4422cb
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 <pth.h>
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8
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9 #include "SDL_thread.h"
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10 #include "SDL_syscond_c.h"
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11 #include "SDL_sysmutex_c.h"
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12
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13 /* Create a condition variable */
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14 SDL_cond * SDL_CreateCond(void)
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15 {
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16 SDL_cond *cond;
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17
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18 cond = (SDL_cond *) SDL_malloc(sizeof(SDL_cond));
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19 if ( cond ) {
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20 if ( pth_cond_init(&(cond->condpth_p)) < 0 ) {
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21 SDL_SetError("pthread_cond_init() failed");
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22 SDL_free(cond);
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23 cond = NULL;
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24 }
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25 } else {
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26 SDL_OutOfMemory();
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27 }
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28 return(cond);
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29 }
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30
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31 /* Destroy a condition variable */
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32 void SDL_DestroyCond(SDL_cond *cond)
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33 {
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34 if ( cond ) {
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35 SDL_free(cond);
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36 }
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37 }
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38
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39 /* Restart one of the threads that are waiting on the condition variable */
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40 int SDL_CondSignal(SDL_cond *cond)
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41 {
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42 int retval;
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43
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44 if ( ! cond ) {
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45 SDL_SetError("Passed a NULL condition variable");
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46 return -1;
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47 }
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48
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49 retval = 0;
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50 if ( pth_cond_notify(&(cond->condpth_p), FALSE) != 0 ) {
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51 SDL_SetError("pth_cond_notify() failed");
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52 retval = -1;
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53 }
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54 return retval;
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55 }
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56
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57 /* Restart all threads that are waiting on the condition variable */
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58 int SDL_CondBroadcast(SDL_cond *cond)
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59 {
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60 int retval;
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61
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62 if ( ! cond ) {
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63 SDL_SetError("Passed a NULL condition variable");
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64 return -1;
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65 }
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66
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67 retval = 0;
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68 if ( pth_cond_notify(&(cond->condpth_p), TRUE) != 0 ) {
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69 SDL_SetError("pth_cond_notify() failed");
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70 retval = -1;
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71 }
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72 return retval;
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73 }
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74
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75 /* Wait on the condition variable for at most 'ms' milliseconds.
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76 The mutex must be locked before entering this function!
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77 The mutex is unlocked during the wait, and locked again after the wait.
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78
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79 Typical use:
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80
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81 Thread A:
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82 SDL_LockMutex(lock);
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83 while ( ! condition ) {
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84 SDL_CondWait(cond);
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85 }
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86 SDL_UnlockMutex(lock);
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87
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88 Thread B:
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89 SDL_LockMutex(lock);
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90 ...
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91 condition = true;
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92 ...
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93 SDL_UnlockMutex(lock);
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94 */
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95 int SDL_CondWaitTimeout(SDL_cond *cond, SDL_mutex *mutex, Uint32 ms)
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96 {
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97 int retval;
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98 pth_event_t ev;
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99 int sec;
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100
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101 if ( ! cond ) {
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102 SDL_SetError("Passed a NULL condition variable");
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103 return -1;
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104 }
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105
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106 retval = 0;
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107
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108 sec = ms/1000;
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109 ev = pth_event(PTH_EVENT_TIME, pth_timeout(sec,(ms-sec*1000)*1000));
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110
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111 if ( pth_cond_await(&(cond->condpth_p), &(mutex->mutexpth_p), ev) != 0 ) {
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112 SDL_SetError("pth_cond_await() failed");
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113 retval = -1;
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114 }
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115
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116 pth_event_free(ev, PTH_FREE_ALL);
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117
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118 return retval;
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119 }
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120
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121 /* Wait on the condition variable forever */
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122 int SDL_CondWait(SDL_cond *cond, SDL_mutex *mutex)
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123 {
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124 int retval;
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125
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126 if ( ! cond ) {
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127 SDL_SetError("Passed a NULL condition variable");
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128 return -1;
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129 }
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130
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131 retval = 0;
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132 if ( pth_cond_await(&(cond->condpth_p), &(mutex->mutexpth_p), NULL) != 0 ) {
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133 SDL_SetError("pth_cond_await() failed");
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134 retval = -1;
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135 }
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136 return retval;
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137 }