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annotate src/thread/dc/SDL_syssem.c @ 1768:814f9f2c7a33

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Fixed bug #80 Date: 21 Apr 2003 17:20:20 +0100 From: Alan Swanson <swanson@uklinux.net> Subject: [SDL] New XFree 4.3 Video Mode Patch If you look at the unsorted list of modes returned by X, here's mine; 1280 x 1024 @ 85.0 > 1024 x 768 @ 100.3 > USER 800 x 600 @ 125.5 > SET 640 x 480 @ 124.9 > 1280 x 1024 @ 75.0 ] 1280 x 1024 @ 60.0 ] 1280 x 960 @ 85.0 ] X11 1280 x 960 @ 60.0 ] AUTO 1152 x 864 @ 75.0 ]=20 1152 x 768 @ 54.8 ] 960 x 720 @ 120.0 ] ... 640 x 400 @ 85.1 ] 256k 576 x 432 @ 150.0 ] 249k PIXEL 640 x 350 @ 85.1 ] 224k COUNT 576 x 384 @ 109.6 ] 221k ... The user set modes come first followed by X set modes which are ordered by decreasing number of pixels and refresh. The reason why every other library or program not using SDL working is due to SDL scanning the modes in reverse getting X11 provided modes modes with the lowest refresh.
author Sam Lantinga <slouken@libsdl.org>
date Fri, 05 May 2006 05:50:26 +0000
parents d910939febfa
children 782fd950bd46 536b0704b7d8
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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 /* An implementation of semaphores using mutexes and condition variables */
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25
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26 #include "SDL_timer.h"
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27 #include "SDL_thread.h"
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28 #include "SDL_systhread_c.h"
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29
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30
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31 #if SDL_THREADS_DISABLED
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32
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33 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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34 {
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35 SDL_SetError("SDL not configured with thread support");
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36 return (SDL_sem *)0;
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37 }
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38
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39 void SDL_DestroySemaphore(SDL_sem *sem)
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40 {
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41 return;
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42 }
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43
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44 int SDL_SemTryWait(SDL_sem *sem)
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45 {
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46 SDL_SetError("SDL not configured with thread support");
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47 return -1;
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48 }
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49
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50 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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51 {
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52 SDL_SetError("SDL not configured with thread support");
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53 return -1;
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54 }
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55
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56 int SDL_SemWait(SDL_sem *sem)
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57 {
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58 SDL_SetError("SDL not configured with thread support");
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59 return -1;
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60 }
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61
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62 Uint32 SDL_SemValue(SDL_sem *sem)
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63 {
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64 return 0;
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65 }
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66
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67 int SDL_SemPost(SDL_sem *sem)
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68 {
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69 SDL_SetError("SDL not configured with thread support");
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70 return -1;
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71 }
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72
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73 #else
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74
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75 #include <kos/sem.h>
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76
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77 struct SDL_semaphore
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78 {
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79 semaphore_t sem;
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80 };
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81
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82 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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83 {
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84 return (SDL_sem *)sem_create(initial_value);
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85 }
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86
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87 /* WARNING:
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88 You cannot call this function when another thread is using the semaphore.
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89 */
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90 void SDL_DestroySemaphore(SDL_sem *sem)
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91 {
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92 if ( ! sem ) {
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93 SDL_SetError("Passed a NULL semaphore");
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94 return;
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95 }
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96
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97 sem_destroy(&sem->sem);
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98 }
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99
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100 int SDL_SemTryWait(SDL_sem *sem)
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101 {
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102 int retval;
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103
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104 if ( ! sem ) {
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105 SDL_SetError("Passed a NULL semaphore");
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106 return -1;
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107 }
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108
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109 retval = sem_trywait(&sem->sem);
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110 if (retval==0) return 0;
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111 else return SDL_MUTEX_TIMEDOUT;
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112
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113 return retval;
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114 }
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115
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116 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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117 {
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118 int retval;
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119
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120 if ( ! sem ) {
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121 SDL_SetError("Passed a NULL semaphore");
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122 return -1;
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123 }
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124
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125 /* A timeout of 0 is an easy case */
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126 if ( timeout == 0 ) {
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127 return SDL_SemTryWait(sem);
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128 }
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129
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130 retval = sem_wait_timed(&sem->sem,timeout);
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131 if (retval==-1) retval= SDL_MUTEX_TIMEDOUT;
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132
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133 return retval;
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134 }
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135
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136 int SDL_SemWait(SDL_sem *sem)
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137 {
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138 if ( ! sem ) {
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139 SDL_SetError("Passed a NULL semaphore");
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140 return -1;
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141 }
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142
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143 sem_wait(&sem->sem);
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144 return 0;
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145 }
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146
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147 Uint32 SDL_SemValue(SDL_sem *sem)
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148 {
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149 if ( ! sem ) {
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150 SDL_SetError("Passed a NULL semaphore");
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151 return -1;
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152 }
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153
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154 return sem_count(&sem->sem);
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155 }
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156
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157 int SDL_SemPost(SDL_sem *sem)
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158 {
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159 if ( ! sem ) {
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160 SDL_SetError("Passed a NULL semaphore");
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161 return -1;
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162 }
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163
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164 sem_signal(&sem->sem);
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165 return 0;
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166 }
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167
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168 #endif /* SDL_THREADS_DISABLED */