Mercurial > sdl-ios-xcode

annotate src/thread/win32/SDL_syssem.c @ 3844:332a59e39ce1 SDL-ryan-multiple-audio-device

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I really don't want to update these last two audio backends...I added an error that says if no one complains, the backends will be removed eventually. So if anyone ever wants them and they care enough to speak up, we'll know to do something about it. If no one does, that's less code to maintain. :)
author Ryan C. Gordon <icculus@icculus.org>
date Tue, 17 Oct 2006 06:45:17 +0000
parents c121d94672cb
children 99210400e8b9
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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 /* Semaphore functions using the Win32 API */
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25
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26 #define WIN32_LEAN_AND_MEAN
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27 #include <windows.h>
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28
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29 #include "SDL_thread.h"
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30 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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31 #include "win_ce_semaphore.h"
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32 #endif
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33
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34
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35 struct SDL_semaphore
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36 {
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37 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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38 SYNCHHANDLE id;
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39 #else
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40 HANDLE id;
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41 #endif
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42 Uint32 volatile count;
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43 };
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44
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45
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46 /* Create a semaphore */
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47 SDL_sem *
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48 SDL_CreateSemaphore(Uint32 initial_value)
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49 {
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50 SDL_sem *sem;
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51
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52 /* Allocate sem memory */
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53 sem = (SDL_sem *) SDL_malloc(sizeof(*sem));
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54 if (sem) {
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55 /* Create the semaphore, with max value 32K */
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56 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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57 sem->id = CreateSemaphoreCE(NULL, initial_value, 32 * 1024, NULL);
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58 #else
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59 sem->id = CreateSemaphore(NULL, initial_value, 32 * 1024, NULL);
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60 #endif
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61 sem->count = initial_value;
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62 if (!sem->id) {
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63 SDL_SetError("Couldn't create semaphore");
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64 SDL_free(sem);
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65 sem = NULL;
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66 }
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67 } else {
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68 SDL_OutOfMemory();
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69 }
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70 return (sem);
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71 }
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72
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73 /* Free the semaphore */
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74 void
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75 SDL_DestroySemaphore(SDL_sem * sem)
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76 {
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77 if (sem) {
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78 if (sem->id) {
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79 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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80 CloseSynchHandle(sem->id);
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81 #else
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82 CloseHandle(sem->id);
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83 #endif
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84 sem->id = 0;
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85 }
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86 SDL_free(sem);
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87 }
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88 }
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89
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90 int
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91 SDL_SemWaitTimeout(SDL_sem * sem, Uint32 timeout)
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92 {
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93 int retval;
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94 DWORD dwMilliseconds;
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95
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96 if (!sem) {
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97 SDL_SetError("Passed a NULL sem");
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98 return -1;
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99 }
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100
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101 if (timeout == SDL_MUTEX_MAXWAIT) {
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102 dwMilliseconds = INFINITE;
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103 } else {
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104 dwMilliseconds = (DWORD) timeout;
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105 }
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106 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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107 switch (WaitForSemaphoreCE(sem->id, dwMilliseconds)) {
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108 #else
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109 switch (WaitForSingleObject(sem->id, dwMilliseconds)) {
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110 #endif
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111 case WAIT_OBJECT_0:
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112 --sem->count;
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113 retval = 0;
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114 break;
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115 case WAIT_TIMEOUT:
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116 retval = SDL_MUTEX_TIMEDOUT;
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117 break;
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118 default:
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119 SDL_SetError("WaitForSingleObject() failed");
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120 retval = -1;
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121 break;
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122 }
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123 return retval;
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124 }
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125
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126 int
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127 SDL_SemTryWait(SDL_sem * sem)
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128 {
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129 return SDL_SemWaitTimeout(sem, 0);
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130 }
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131
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132 int
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133 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
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140 SDL_SemValue(SDL_sem * sem)
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141 {
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142 if (!sem) {
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143 SDL_SetError("Passed a NULL sem");
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144 return 0;
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145 }
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146 return sem->count;
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147 }
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148
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149 int
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150 SDL_SemPost(SDL_sem * sem)
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151 {
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152 if (!sem) {
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153 SDL_SetError("Passed a NULL sem");
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154 return -1;
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155 }
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156 /* Increase the counter in the first place, because
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157 * after a successful release the semaphore may
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158 * immediately get destroyed by another thread which
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159 * is waiting for this semaphore.
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160 */
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161 ++sem->count;
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162 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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163 if (ReleaseSemaphoreCE(sem->id, 1, NULL) == FALSE) {
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164 #else
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165 if (ReleaseSemaphore(sem->id, 1, NULL) == FALSE) {
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166 #endif
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167 --sem->count; /* restore */
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168 SDL_SetError("ReleaseSemaphore() failed");
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169 return -1;
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170 }
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171 return 0;
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172 }
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173
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174 /* vi: set ts=4 sw=4 expandtab: */