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3975
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1 /*
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2 SDL - Simple DirectMedia Layer
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4159
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3 Copyright (C) 1997-2009 Sam Lantinga
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3975
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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@devolution.com
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21 */
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22
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23 /*
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24 SDL_syssem.cpp
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25
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26 Epoc version by Markus Mertama (w@iki.fi)
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27 */
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28
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29 #ifdef SAVE_RCSID
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30 static char rcsid =
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31 "@(#) $Id: SDL_syssem.c,v 1.1.2.4 2000/06/22 15:24:48 hercules Exp $";
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32 #endif
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33
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34 /* Semaphore functions using the Win32 API */
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35
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36 //#include <stdio.h>
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37 //#include <stdlib.h>
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38 #include <e32std.h>
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39
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40 #include "SDL_error.h"
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41 #include "SDL_thread.h"
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42
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43
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44 #define SDL_MUTEX_TIMEOUT -2
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45
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46 struct SDL_semaphore
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47 {
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48 TInt handle;
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49 TInt count;
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50 };
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51
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52
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53 extern TInt CreateUnique(TInt (*aFunc)(const TDesC& aName, TAny*, TAny*), TAny*, TAny*);
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54 #ifndef EKA2
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55 extern TInt NewThread(const TDesC& aName, TAny* aPtr1, TAny* aPtr2);
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56 #endif
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57
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58 TInt NewSema(const TDesC& aName, TAny* aPtr1, TAny* aPtr2)
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59 {
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60 TInt value = *((TInt*) aPtr2);
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61 return ((RSemaphore*)aPtr1)->CreateGlobal(aName, value);
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62 }
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63
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64 /* Create a semaphore */
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65 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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66 {
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67 RSemaphore s;
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68 TInt status = CreateUnique(NewSema, &s, &initial_value);
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69 if(status != KErrNone)
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70 {
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71 SDL_SetError("Couldn't create semaphore");
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72 }
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73 SDL_semaphore* sem = new /*(ELeave)*/ SDL_semaphore;
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74 sem->handle = s.Handle();
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75 sem->count = initial_value;
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76 return(sem);
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77 }
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78
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79 /* Free the semaphore */
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80 void SDL_DestroySemaphore(SDL_sem *sem)
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81 {
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82 if ( sem )
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83 {
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84 RSemaphore sema;
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85 sema.SetHandle(sem->handle);
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86 while(--sem->count)
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87 sema.Signal();
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88 sema.Close();
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89 delete sem;
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90 sem = NULL;
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91 }
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92 }
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93
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94 #ifndef EKA2
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95
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96 struct TInfo
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97 {
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98 TInfo(TInt aTime, TInt aHandle) :
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99 iTime(aTime), iHandle(aHandle), iVal(0) {}
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100 TInt iTime;
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101 TInt iHandle;
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102 TInt iVal;
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103 };
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104
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105
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106
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107 TBool ThreadRun(TAny* aInfo)
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108 {
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109 TInfo* info = STATIC_CAST(TInfo*, aInfo);
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110 User::After(info->iTime);
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111 RSemaphore sema;
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112 sema.SetHandle(info->iHandle);
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113 sema.Signal();
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114 info->iVal = SDL_MUTEX_TIMEOUT;
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115 return 0;
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116 }
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117
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118 #endif
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119
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120
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121 void _WaitAll(SDL_sem *sem)
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122 {
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123 //since SemTryWait may changed the counter.
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124 //this may not be atomic, but hopes it works.
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125 RSemaphore sema;
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126 sema.SetHandle(sem->handle);
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127 sema.Wait();
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128 while(sem->count < 0)
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129 {
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130 sema.Wait();
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131 }
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132 }
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133
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134 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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135 {
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136 if ( ! sem ) {
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137 SDL_SetError("Passed a NULL sem");
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138 return -1;
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139 }
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140
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141 if ( timeout == SDL_MUTEX_MAXWAIT )
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142 {
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143 _WaitAll(sem);
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144 return SDL_MUTEX_MAXWAIT;
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145 }
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146
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147 #ifdef EKA2
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148
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149 RSemaphore sema;
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150 sema.SetHandle(sem->handle);
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151 if(KErrNone == sema.Wait(timeout))
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152 return 0;
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153 return -1;
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154 #else
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155 RThread thread;
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156
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157 TInfo* info = new (ELeave)TInfo(timeout, sem->handle);
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158
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159 TInt status = CreateUnique(NewThread, &thread, info);
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160
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161 if(status != KErrNone)
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162 return status;
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163
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164 thread.Resume();
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165
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166 _WaitAll(sem);
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167
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168 if(thread.ExitType() == EExitPending)
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169 {
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170 thread.Kill(SDL_MUTEX_TIMEOUT);
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171 }
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172
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173 thread.Close();
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174
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175 return info->iVal;
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176 #endif
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177 }
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178
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179 int SDL_SemTryWait(SDL_sem *sem)
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180 {
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181 if(sem->count > 0)
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182 {
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183 sem->count--;
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184 }
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185 return SDL_MUTEX_TIMEOUT;
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186 }
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187
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188 int SDL_SemWait(SDL_sem *sem)
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189 {
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190 return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT);
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191 }
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192
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193 /* Returns the current count of the semaphore */
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194 Uint32 SDL_SemValue(SDL_sem *sem)
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195 {
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196 if ( ! sem ) {
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197 SDL_SetError("Passed a NULL sem");
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198 return 0;
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199 }
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200 return sem->count;
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201 }
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202
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203 int SDL_SemPost(SDL_sem *sem)
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204 {
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205 if ( ! sem ) {
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206 SDL_SetError("Passed a NULL sem");
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207 return -1;
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208 }
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209 sem->count++;
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210 RSemaphore sema;
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211 sema.SetHandle(sem->handle);
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212 sema.Signal();
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213 return 0;
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214 }
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