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annotate src/thread/pth/SDL_syscond.c @ 1240:3b8a43c428bb

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From Bug #36: There are a couple of issues with the selection of Altivec alpha-blitting routines in CalculateAlphaBlit() in src/video/SDL_Blit_A.c. 1) There's no check for the presence of Altivec when checking if the Blit32to565PixelAlphaAltivec() routine can be selected. 2) Altivec cannot be used in video memory, and there's no check if the destination surface is a hardware surface. (Alpha-blitting to a hardware surface with GPU support is a bad idea, but somebody's bound to do it anyway.) Patch to fix these attached.
author Ryan C. Gordon <icculus@icculus.org>
date Sun, 08 Jan 2006 21:18:15 +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 }