annotate src/thread/pth/SDL_syscond.c @ 1258:b2283b0ded26

Date: Thu, 19 Jan 2006 20:02:29 +0200 From: Vassilis Virvilis <vasvir@iit.demokritos.gr> Subject: [SDL] Request: Please reconsider adding tag in SDL_Event Hi, Patch in question: --- include/SDL_events.h 20 Aug 2004 18:57:01 -0000 1.11 +++ include/SDL_events.h 19 Jan 2006 17:35:09 -0000 @@ -214,7 +214,7 @@ } SDL_SysWMEvent; /* General event structure */ -typedef union { +typedef union SDL_Event { Uint8 type; SDL_ActiveEvent active; SDL_KeyboardEvent key; Reasoning: ---------- 1) Allows forward declaration of the SDL_Event union in C++. Please note that in plain C it is possible to forward declare it. 2) Forward declaration is good because it allows encapsulation. It hides the specific implementation and does not necessarily exposes SDL staff to my appication's namespace 3) It can't harm plain C because tags are living in a different namespace than typenames 4) It is already done like this in other places in SDL. Check for example SDL_KeySym, and SDL_.*Event structures. 5) Right now I have to include SDL/event.h from a C++ header file. See 2)
author Sam Lantinga <slouken@libsdl.org>
date Fri, 20 Jan 2006 13:07:25 +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 }