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annotate src/thread/os2/SDL_syssem.c @ 1668:4da1ee79c9af SDL-1.3

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more tweaking indent options
author Sam Lantinga <slouken@libsdl.org>
date Mon, 29 May 2006 04:04:35 +0000
parents 782fd950bd46
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) 1997-2006 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 OS/2 API */
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25
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26 #define INCL_DOS
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27 #define INCL_DOSERRORS
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28 #define INCL_DOSSEMAPHORES
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29 #include <os2.h>
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30
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31 #include "SDL_thread.h"
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32 #include "SDL_timer.h"
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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 HMTX id;
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38 HEV changed;
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39 Uint32 value;
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40 };
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41
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42
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43 /* Create a semaphore */
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44 DECLSPEC SDL_sem *SDLCALL
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45 SDL_CreateSemaphore(Uint32 initial_value)
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46 {
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47 SDL_sem *sem;
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48 ULONG ulrc;
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49
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50 /* Allocate sem memory */
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51 sem = (SDL_sem *) SDL_malloc(sizeof(*sem));
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52 if (sem) {
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53 /* Create the mutex semaphore */
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54 ulrc = DosCreateMutexSem(NULL, &(sem->id), 0, TRUE);
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55 if (ulrc) {
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56 SDL_SetError("Couldn't create semaphore");
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57 SDL_free(sem);
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58 sem = NULL;
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59 } else {
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60 DosCreateEventSem(NULL, &(sem->changed), 0, FALSE);
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61 sem->value = initial_value;
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62 DosReleaseMutexSem(sem->id);
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63 }
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64 } else {
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65 SDL_OutOfMemory();
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66 }
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67 return (sem);
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68 }
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69
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70 /* Free the semaphore */
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71 DECLSPEC void SDLCALL
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72 SDL_DestroySemaphore(SDL_sem * sem)
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73 {
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74 if (sem) {
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75 if (sem->id) {
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76 DosCloseEventSem(sem->changed);
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77 DosCloseMutexSem(sem->id);
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78 sem->id = 0;
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79 }
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80 SDL_free(sem);
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81 }
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82 }
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83
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84 DECLSPEC int SDLCALL
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85 SDL_SemWaitTimeout(SDL_sem * sem, Uint32 timeout)
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86 {
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87 ULONG ulrc;
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88
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89 if (!sem) {
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90 SDL_SetError("Passed a NULL sem");
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91 return -1;
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92 }
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93
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94 if (timeout == SDL_MUTEX_MAXWAIT) {
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95 while (1) {
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96 ulrc = DosRequestMutexSem(sem->id, SEM_INDEFINITE_WAIT);
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97 if (ulrc) {
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98 /* if error waiting mutex */
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99 SDL_SetError("DosRequestMutexSem() failed");
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100 return -1;
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101 } else if (sem->value) {
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102 sem->value--;
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103 DosReleaseMutexSem(sem->id);
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104 return 0;
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105 } else {
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106 ULONG ulPostCount;
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107 DosResetEventSem(sem->changed, &ulPostCount);
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108 DosReleaseMutexSem(sem->id);
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109 /* continue waiting until somebody posts the semaphore */
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110 DosWaitEventSem(sem->changed, SEM_INDEFINITE_WAIT);
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111 }
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112 }
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113 } else if (timeout == 0) {
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114 ulrc = DosRequestMutexSem(sem->id, SEM_INDEFINITE_WAIT);
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115 if (ulrc == NO_ERROR) {
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116 if (sem->value) {
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117 sem->value--;
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118 DosReleaseMutexSem(sem->id);
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119 return 0;
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120 } else {
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121 DosReleaseMutexSem(sem->id);
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122 return SDL_MUTEX_TIMEDOUT;
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123 }
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124 } else {
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125 SDL_SetError("DosRequestMutexSem() failed");
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126 return -1;
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127 }
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128 } else {
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129 ulrc = DosRequestMutexSem(sem->id, SEM_INDEFINITE_WAIT);
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130 if (ulrc) {
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131 /* if error waiting mutex */
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132 SDL_SetError("DosRequestMutexSem() failed");
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133 return -1;
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134 } else if (sem->value) {
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135 sem->value--;
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136 DosReleaseMutexSem(sem->id);
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137 return 0;
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138 } else {
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139 ULONG ulPostCount;
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140 DosResetEventSem(sem->changed, &ulPostCount);
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141 DosReleaseMutexSem(sem->id);
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142 /* continue waiting until somebody posts the semaphore */
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143 ulrc = DosWaitEventSem(sem->changed, timeout);
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144 if (ulrc == NO_ERROR)
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145 return 0;
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146 else
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147 return SDL_MUTEX_TIMEDOUT;
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148 }
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149 }
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150 /* never reached */
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151 return -1;
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152 }
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153
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154 DECLSPEC int SDLCALL
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155 SDL_SemTryWait(SDL_sem * sem)
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156 {
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157 return SDL_SemWaitTimeout(sem, 0);
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158 }
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159
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160 DECLSPEC int SDLCALL
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161 SDL_SemWait(SDL_sem * sem)
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162 {
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163 return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT);
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164 }
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165
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166 /* Returns the current count of the semaphore */
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167 DECLSPEC Uint32 SDLCALL
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168 SDL_SemValue(SDL_sem * sem)
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169 {
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170 if (!sem) {
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171 SDL_SetError("Passed a NULL sem");
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172 return 0;
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173 }
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174 return sem->value;
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175 }
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176
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177 DECLSPEC int SDLCALL
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178 SDL_SemPost(SDL_sem * sem)
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179 {
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180 if (!sem) {
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181 SDL_SetError("Passed a NULL sem");
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182 return -1;
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183 }
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184 if (DosRequestMutexSem(sem->id, SEM_INDEFINITE_WAIT)) {
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185 SDL_SetError("DosRequestMutexSem() failed");
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186 return -1;
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187 }
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188 sem->value++;
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189 DosPostEventSem(sem->changed);
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190 DosReleaseMutexSem(sem->id);
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191 return 0;
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192 }
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193
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194 /* vi: set ts=4 sw=4 expandtab: */