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annotate src/thread/pthread/SDL_syscond.c @ 4170:092c0bc69155 SDL-1.2

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Fixed bug #618 Description From Tim Angus 2008-08-30 12:23:56 (-) [reply] As we all know SDL 1.2 doesn't handle dead keys well since one key press potentially equals two (or more) characters. For example, on many layouts, keying <backquote>,<space> results in <no character>,<backquote><space>. Since the unicode member of the SDL_keysym struct only has room for one character, only one can be returned. On Linux, the first character is returned. On Windows however, unless the exact number of characters generated by the keypress is 1, nothing is returned. The following patch addresses this inconsistency. Updated patch which includes a further fix to the handling of the numpad when numlock is on. This further fix is courtesy Amanieu d'Antras.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 13 Apr 2009 08:42:09 +0000
parents a1b03ba2fcd0
children
rev   line source
1361
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 #include <sys/time.h>
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25 #include <unistd.h>
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26 #include <errno.h>
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27 #include <pthread.h>
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28
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29 #include "SDL_thread.h"
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30 #include "SDL_sysmutex_c.h"
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31
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32 struct SDL_cond
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33 {
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34 pthread_cond_t cond;
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35 };
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36
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37 /* Create a condition variable */
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38 SDL_cond * SDL_CreateCond(void)
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39 {
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40 SDL_cond *cond;
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41
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42 cond = (SDL_cond *) SDL_malloc(sizeof(SDL_cond));
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43 if ( cond ) {
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44 if ( pthread_cond_init(&cond->cond, NULL) < 0 ) {
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45 SDL_SetError("pthread_cond_init() failed");
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46 SDL_free(cond);
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47 cond = NULL;
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48 }
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49 }
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50 return(cond);
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51 }
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52
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53 /* Destroy a condition variable */
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54 void SDL_DestroyCond(SDL_cond *cond)
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55 {
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56 if ( cond ) {
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57 pthread_cond_destroy(&cond->cond);
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58 SDL_free(cond);
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59 }
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60 }
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61
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62 /* Restart one of the threads that are waiting on the condition variable */
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63 int SDL_CondSignal(SDL_cond *cond)
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64 {
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65 int retval;
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66
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67 if ( ! cond ) {
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68 SDL_SetError("Passed a NULL condition variable");
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69 return -1;
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70 }
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71
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72 retval = 0;
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73 if ( pthread_cond_signal(&cond->cond) != 0 ) {
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74 SDL_SetError("pthread_cond_signal() failed");
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75 retval = -1;
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76 }
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77 return retval;
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78 }
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79
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80 /* Restart all threads that are waiting on the condition variable */
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81 int SDL_CondBroadcast(SDL_cond *cond)
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82 {
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83 int retval;
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84
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85 if ( ! cond ) {
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86 SDL_SetError("Passed a NULL condition variable");
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87 return -1;
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88 }
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89
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90 retval = 0;
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91 if ( pthread_cond_broadcast(&cond->cond) != 0 ) {
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92 SDL_SetError("pthread_cond_broadcast() failed");
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93 retval = -1;
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94 }
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95 return retval;
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96 }
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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 struct timeval delta;
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102 struct timespec abstime;
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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 gettimeofday(&delta, NULL);
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110
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111 abstime.tv_sec = delta.tv_sec + (ms/1000);
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112 abstime.tv_nsec = (delta.tv_usec + (ms%1000) * 1000) * 1000;
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113 if ( abstime.tv_nsec > 1000000000 ) {
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114 abstime.tv_sec += 1;
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115 abstime.tv_nsec -= 1000000000;
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116 }
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117
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118 tryagain:
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119 retval = pthread_cond_timedwait(&cond->cond, &mutex->id, &abstime);
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120 switch (retval) {
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121 case EINTR:
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122 goto tryagain;
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123 break;
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124 case ETIMEDOUT:
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125 retval = SDL_MUTEX_TIMEDOUT;
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126 break;
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127 case 0:
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128 break;
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129 default:
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130 SDL_SetError("pthread_cond_timedwait() failed");
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131 retval = -1;
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132 break;
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133 }
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134 return retval;
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135 }
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136
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137 /* Wait on the condition variable, unlocking the provided mutex.
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138 The mutex must be locked before entering this function!
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139 */
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140 int SDL_CondWait(SDL_cond *cond, SDL_mutex *mutex)
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141 {
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142 int retval;
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143
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144 if ( ! cond ) {
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145 SDL_SetError("Passed a NULL condition variable");
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146 return -1;
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147 }
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148
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149 retval = 0;
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150 if ( pthread_cond_wait(&cond->cond, &mutex->id) != 0 ) {
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151 SDL_SetError("pthread_cond_wait() failed");
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152 retval = -1;
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153 }
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154 return retval;
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155 }