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annotate src/thread/epoc/SDL_syssem.cpp @ 1077:f122afdfa025

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The Darwin/MacOSX joystick code is largely copied from the HID Utilities package...make the symbols defined by HID Utilities static inside SDL so that an app can link against their own copy of this package without symbol clash.
author Ryan C. Gordon <icculus@icculus.org>
date Wed, 15 Jun 2005 23:41:57 +0000
parents e8157fcb3114
children c9b51268668f
rev   line source
173
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000 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 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@libsdl.org
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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 "@(#) $Id$";
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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 extern TInt CreateUnique(TInt (*aFunc)(const TDesC& aName, TAny*, TAny*), TAny*, TAny*);
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53 extern TInt NewThread(const TDesC& aName, TAny* aPtr1, TAny* aPtr2);
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54
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55 TInt NewSema(const TDesC& aName, TAny* aPtr1, TAny* aPtr2)
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56 {
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57 TInt value = *((TInt*) aPtr2);
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58 return ((RSemaphore*)aPtr1)->CreateGlobal(aName, value);
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59 }
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60
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61 /* Create a semaphore */
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62 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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63 {
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64 RSemaphore s;
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65 TInt status = CreateUnique(NewSema, &s, &initial_value);
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66 if(status != KErrNone)
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67 {
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68 SDL_SetError("Couldn't create semaphore");
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69 }
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70 SDL_semaphore* sem = new /*(ELeave)*/ SDL_semaphore;
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71 sem->handle = s.Handle();
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72 sem->count = initial_value;
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73 return(sem);
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74 }
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75
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76 /* Free the semaphore */
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77 void SDL_DestroySemaphore(SDL_sem *sem)
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78 {
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79 if ( sem )
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80 {
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81 RSemaphore sema;
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82 sema.SetHandle(sem->handle);
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83 sema.Signal(sema.Count());
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84 sema.Close();
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85 delete sem;
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86 sem = NULL;
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87 }
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88 }
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89
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90
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91 struct TInfo
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92 {
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93 TInfo(TInt aTime, TInt aHandle) :
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94 iTime(aTime), iHandle(aHandle), iVal(0) {}
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95 TInt iTime;
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96 TInt iHandle;
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97 TInt iVal;
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98 };
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99
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100 TBool ThreadRun(TAny* aInfo)
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101 {
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102 TInfo* info = STATIC_CAST(TInfo*, aInfo);
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103 User::After(info->iTime);
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104 RSemaphore sema;
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105 sema.SetHandle(info->iHandle);
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106 sema.Signal();
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107 info->iVal = SDL_MUTEX_TIMEOUT;
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108 return 0;
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109 }
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110
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111
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112
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113
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114 void _WaitAll(SDL_sem *sem)
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115 {
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116 //since SemTryWait may changed the counter.
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117 //this may not be atomic, but hopes it works.
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118 RSemaphore sema;
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119 sema.SetHandle(sem->handle);
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120 sema.Wait();
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121 while(sem->count < 0)
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122 {
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123 sema.Wait();
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124 }
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125 }
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126
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127 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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128 {
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129 if ( ! sem ) {
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130 SDL_SetError("Passed a NULL sem");
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131 return -1;
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132 }
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133
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134 if ( timeout == SDL_MUTEX_MAXWAIT )
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135 {
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136 _WaitAll(sem);
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137 return SDL_MUTEX_MAXWAIT;
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138 }
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139
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140
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141 RThread thread;
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142
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143 TInfo* info = new (ELeave)TInfo(timeout, sem->handle);
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144
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145 TInt status = CreateUnique(NewThread, &thread, info);
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146
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147 if(status != KErrNone)
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148 return status;
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149
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150 thread.Resume();
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151
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152 _WaitAll(sem);
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153
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154 if(thread.ExitType() == EExitPending)
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155 {
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156 thread.Kill(SDL_MUTEX_TIMEOUT);
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157 }
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158
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159 thread.Close();
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160
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161 return info->iVal;
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162 }
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163
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164 int SDL_SemTryWait(SDL_sem *sem)
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165 {
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166 if(sem->count > 0)
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167 {
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168 sem->count--;
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169 }
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170 return SDL_MUTEX_TIMEOUT;
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171 }
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172
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173 int SDL_SemWait(SDL_sem *sem)
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174 {
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175 return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT);
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176 }
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177
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178 /* Returns the current count of the semaphore */
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179 Uint32 SDL_SemValue(SDL_sem *sem)
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180 {
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181 if ( ! sem ) {
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182 SDL_SetError("Passed a NULL sem");
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183 return 0;
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184 }
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185 return sem->count;
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186 }
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187
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188 int SDL_SemPost(SDL_sem *sem)
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189 {
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190 if ( ! sem ) {
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191 SDL_SetError("Passed a NULL sem");
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192 return -1;
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193 }
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194 sem->count++;
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195 RSemaphore sema;
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196 sema.SetHandle(sem->handle);
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197 sema.Signal();
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198 return 0;
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199 }