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annotate src/thread/pthread/SDL_syssem.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 99acf3d856cb
rev   line source
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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 <pthread.h>
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25 #include <semaphore.h>
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26 #include <errno.h>
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27
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28 #include "SDL_thread.h"
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29 #include "SDL_timer.h"
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30
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31 /* Wrapper around POSIX 1003.1b semaphores */
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32
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33 #ifdef __MACOSX__
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34 /* Mac OS X doesn't support sem_getvalue() as of version 10.4 */
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35 #include "../generic/SDL_syssem.c"
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36 #else
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37
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38 struct SDL_semaphore {
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39 sem_t sem;
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40 };
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41
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42 /* Create a semaphore, initialized with value */
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43 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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44 {
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45 SDL_sem *sem = (SDL_sem *) SDL_malloc(sizeof(SDL_sem));
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46 if ( sem ) {
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47 if ( sem_init(&sem->sem, 0, initial_value) < 0 ) {
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48 SDL_SetError("sem_init() failed");
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49 SDL_free(sem);
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50 sem = NULL;
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51 }
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52 } else {
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53 SDL_OutOfMemory();
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54 }
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55 return sem;
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56 }
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57
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58 void SDL_DestroySemaphore(SDL_sem *sem)
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59 {
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60 if ( sem ) {
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61 sem_destroy(&sem->sem);
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62 SDL_free(sem);
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63 }
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64 }
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65
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66 int SDL_SemTryWait(SDL_sem *sem)
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67 {
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68 int retval;
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69
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70 if ( ! sem ) {
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71 SDL_SetError("Passed a NULL semaphore");
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72 return -1;
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73 }
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74 retval = SDL_MUTEX_TIMEDOUT;
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75 if ( sem_trywait(&sem->sem) == 0 ) {
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76 retval = 0;
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77 }
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78 return retval;
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79 }
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80
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81 int SDL_SemWait(SDL_sem *sem)
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82 {
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83 int retval;
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84
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85 if ( ! sem ) {
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86 SDL_SetError("Passed a NULL semaphore");
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87 return -1;
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88 }
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89
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90 while ( ((retval = sem_wait(&sem->sem)) == -1) && (errno == EINTR) ) {}
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91 if ( retval < 0 ) {
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92 SDL_SetError("sem_wait() failed");
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93 }
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94 return retval;
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95 }
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96
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97 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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98 {
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99 int retval;
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100
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101 if ( ! sem ) {
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102 SDL_SetError("Passed a NULL semaphore");
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103 return -1;
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104 }
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105
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106 /* Try the easy cases first */
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107 if ( timeout == 0 ) {
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108 return SDL_SemTryWait(sem);
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109 }
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110 if ( timeout == SDL_MUTEX_MAXWAIT ) {
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111 return SDL_SemWait(sem);
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112 }
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113
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114 /* Ack! We have to busy wait... */
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115 /* FIXME: Use sem_timedwait()? */
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116 timeout += SDL_GetTicks();
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117 do {
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118 retval = SDL_SemTryWait(sem);
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119 if ( retval == 0 ) {
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120 break;
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121 }
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122 SDL_Delay(1);
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123 } while ( SDL_GetTicks() < timeout );
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124
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125 return retval;
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126 }
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127
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128 Uint32 SDL_SemValue(SDL_sem *sem)
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129 {
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130 int ret = 0;
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131 if ( sem ) {
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132 sem_getvalue(&sem->sem, &ret);
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133 if ( ret < 0 ) {
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134 ret = 0;
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135 }
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136 }
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137 return (Uint32)ret;
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138 }
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139
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140 int SDL_SemPost(SDL_sem *sem)
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141 {
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142 int retval;
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143
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144 if ( ! sem ) {
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145 SDL_SetError("Passed a NULL semaphore");
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146 return -1;
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147 }
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148
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149 retval = sem_post(&sem->sem);
1361
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150 if ( retval < 0 ) {
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151 SDL_SetError("sem_post() failed");
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152 }
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153 return retval;
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154 }
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155
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156 #endif /* __MACOSX__ */