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annotate src/thread/windows/SDL_syssem.c @ 5267:b530ef003506

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Happy 2011! :)
author Sam Lantinga <slouken@libsdl.org>
date Fri, 11 Feb 2011 22:37:15 -0800
parents 327f181542f1
children
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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b530ef003506 Happy 2011! :)
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3 Copyright (C) 1997-2011 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 #include "../../core/windows/SDL_windows.h"
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27
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28 #include "SDL_thread.h"
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29 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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30 #include "win_ce_semaphore.h"
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31 #endif
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32
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33
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34 struct SDL_semaphore
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35 {
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36 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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37 SYNCHHANDLE id;
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38 #else
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39 HANDLE id;
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40 #endif
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41 LONG count;
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42 };
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43
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44
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45 /* Create a semaphore */
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46 SDL_sem *
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47 SDL_CreateSemaphore(Uint32 initial_value)
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48 {
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49 SDL_sem *sem;
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50
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51 /* Allocate sem memory */
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52 sem = (SDL_sem *) SDL_malloc(sizeof(*sem));
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53 if (sem) {
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54 /* Create the semaphore, with max value 32K */
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55 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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56 sem->id = CreateSemaphoreCE(NULL, initial_value, 32 * 1024, NULL);
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57 #else
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58 sem->id = CreateSemaphore(NULL, initial_value, 32 * 1024, NULL);
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59 #endif
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60 sem->count = initial_value;
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61 if (!sem->id) {
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62 SDL_SetError("Couldn't create semaphore");
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63 SDL_free(sem);
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64 sem = NULL;
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65 }
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66 } else {
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67 SDL_OutOfMemory();
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68 }
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69 return (sem);
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70 }
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71
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72 /* Free the semaphore */
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73 void
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74 SDL_DestroySemaphore(SDL_sem * sem)
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75 {
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76 if (sem) {
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77 if (sem->id) {
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78 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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79 CloseSynchHandle(sem->id);
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80 #else
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81 CloseHandle(sem->id);
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82 #endif
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83 sem->id = 0;
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84 }
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85 SDL_free(sem);
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86 }
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87 }
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88
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89 int
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90 SDL_SemWaitTimeout(SDL_sem * sem, Uint32 timeout)
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91 {
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92 int retval;
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93 DWORD dwMilliseconds;
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94
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95 if (!sem) {
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96 SDL_SetError("Passed a NULL sem");
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97 return -1;
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98 }
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99
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100 if (timeout == SDL_MUTEX_MAXWAIT) {
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101 dwMilliseconds = INFINITE;
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102 } else {
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103 dwMilliseconds = (DWORD) timeout;
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104 }
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105 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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106 switch (WaitForSemaphoreCE(sem->id, dwMilliseconds)) {
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107 #else
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108 switch (WaitForSingleObject(sem->id, dwMilliseconds)) {
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109 #endif
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110 case WAIT_OBJECT_0:
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111 InterlockedDecrement(&sem->count);
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112 retval = 0;
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113 break;
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114 case WAIT_TIMEOUT:
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115 retval = SDL_MUTEX_TIMEDOUT;
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116 break;
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117 default:
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118 SDL_SetError("WaitForSingleObject() failed");
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119 retval = -1;
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120 break;
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121 }
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122 return retval;
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123 }
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124
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125 int
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126 SDL_SemTryWait(SDL_sem * sem)
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127 {
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128 return SDL_SemWaitTimeout(sem, 0);
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129 }
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130
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131 int
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132 SDL_SemWait(SDL_sem * sem)
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133 {
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134 return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT);
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135 }
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136
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137 /* Returns the current count of the semaphore */
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138 Uint32
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139 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 (Uint32)sem->count;
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146 }
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147
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148 int
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149 SDL_SemPost(SDL_sem * sem)
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150 {
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151 if (!sem) {
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152 SDL_SetError("Passed a NULL sem");
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153 return -1;
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154 }
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155 /* Increase the counter in the first place, because
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156 * after a successful release the semaphore may
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157 * immediately get destroyed by another thread which
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158 * is waiting for this semaphore.
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159 */
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160 InterlockedIncrement(&sem->count);
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161 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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162 if (ReleaseSemaphoreCE(sem->id, 1, NULL) == FALSE) {
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163 #else
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164 if (ReleaseSemaphore(sem->id, 1, NULL) == FALSE) {
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165 #endif
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166 InterlockedDecrement(&sem->count); /* restore */
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167 SDL_SetError("ReleaseSemaphore() failed");
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168 return -1;
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169 }
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170 return 0;
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171 }
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172
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173 /* vi: set ts=4 sw=4 expandtab: */