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annotate src/thread/win32/SDL_syssem.c @ 4971:158bb5752974

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Updated headers to match wiki documentation
author Sam Lantinga <slouken@libsdl.org>
date Wed, 12 Jan 2011 09:47:33 -0800
parents 883a2f2ff43f
children
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 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 LONG 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 InterlockedDecrement(&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 (Uint32)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 InterlockedIncrement(&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 InterlockedDecrement(&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: */