annotate src/thread/win32/SDL_syssem.c @ 769:b8d311d90021

Updated copyright information for 2004 (Happy New Year!)
author Sam Lantinga <slouken@libsdl.org>
date Sun, 04 Jan 2004 16:49:27 +0000
parents f6ffac90895c
children c9b51268668f
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /* Semaphore functions using the Win32 API */
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29
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30 #include <stdio.h>
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31 #include <stdlib.h>
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32 #include <windows.h>
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33
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34 #include "SDL_error.h"
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35 #include "SDL_thread.h"
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36 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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37 #include "win_ce_semaphore.h"
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38 #endif
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39
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40
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41 struct SDL_semaphore {
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42 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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43 SYNCHHANDLE id;
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44 #else
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45 HANDLE id;
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46 #endif
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47 Uint32 volatile count;
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48 };
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49
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50
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51 /* Create a semaphore */
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52 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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53 {
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54 SDL_sem *sem;
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55
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56 /* Allocate sem memory */
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57 sem = (SDL_sem *)malloc(sizeof(*sem));
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58 if ( sem ) {
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59 /* Create the semaphore, with max value 32K */
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60 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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61 sem->id = CreateSemaphoreCE(NULL, initial_value, 32*1024, NULL);
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62 #else
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63 sem->id = CreateSemaphore(NULL, initial_value, 32*1024, NULL);
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64 #endif
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65 sem->count = initial_value;
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66 if ( ! sem->id ) {
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67 SDL_SetError("Couldn't create semaphore");
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68 free(sem);
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69 sem = NULL;
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70 }
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71 } else {
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72 SDL_OutOfMemory();
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73 }
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74 return(sem);
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75 }
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76
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77 /* Free the semaphore */
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78 void SDL_DestroySemaphore(SDL_sem *sem)
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79 {
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80 if ( sem ) {
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81 if ( sem->id ) {
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82 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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83 CloseSynchHandle(sem->id);
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84 #else
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85 CloseHandle(sem->id);
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86 #endif
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87 sem->id = 0;
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88 }
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89 free(sem);
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90 }
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91 }
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92
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93 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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94 {
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95 int retval;
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96 DWORD dwMilliseconds;
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97
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98 if ( ! sem ) {
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99 SDL_SetError("Passed a NULL sem");
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100 return -1;
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101 }
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102
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103 if ( timeout == SDL_MUTEX_MAXWAIT ) {
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104 dwMilliseconds = INFINITE;
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105 } else {
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106 dwMilliseconds = (DWORD)timeout;
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107 }
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108 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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109 switch (WaitForSemaphoreCE(sem->id, dwMilliseconds)) {
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110 #else
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111 switch (WaitForSingleObject(sem->id, dwMilliseconds)) {
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112 #endif
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113 case WAIT_OBJECT_0:
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114 --sem->count;
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115 retval = 0;
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116 break;
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117 case WAIT_TIMEOUT:
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118 retval = SDL_MUTEX_TIMEDOUT;
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119 break;
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120 default:
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121 SDL_SetError("WaitForSingleObject() failed");
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122 retval = -1;
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123 break;
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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 int SDL_SemTryWait(SDL_sem *sem)
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129 {
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130 return SDL_SemWaitTimeout(sem, 0);
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131 }
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132
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133 int SDL_SemWait(SDL_sem *sem)
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134 {
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135 return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT);
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136 }
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137
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138 /* Returns the current count of the semaphore */
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139 Uint32 SDL_SemValue(SDL_sem *sem)
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140 {
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141 if ( ! sem ) {
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142 SDL_SetError("Passed a NULL sem");
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143 return 0;
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144 }
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145 return sem->count;
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146 }
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147
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148 int SDL_SemPost(SDL_sem *sem)
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149 {
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150 if ( ! sem ) {
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151 SDL_SetError("Passed a NULL sem");
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152 return -1;
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153 }
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154 /* Increase the counter in the first place, because
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155 * after a successful release the semaphore may
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156 * immediately get destroyed by another thread which
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157 * is waiting for this semaphore.
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158 */
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159 ++sem->count;
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160 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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161 if ( ReleaseSemaphoreCE(sem->id, 1, NULL) == FALSE ) {
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162 #else
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163 if ( ReleaseSemaphore(sem->id, 1, NULL) == FALSE ) {
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164 #endif
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165 --sem->count; /* restore */
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166 SDL_SetError("ReleaseSemaphore() failed");
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167 return -1;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
168 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
169 return 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
170 }