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annotate src/thread/epoc/SDL_syssem.cpp @ 1204:f9794ee91dfc

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Date: Tue, 13 Dec 2005 13:33:50 +0000 From: "alan buckley" Subject: Patch to fix audio locking on RISC OS When threads were not disabled on a RISC OS build the audio mixer mutex was not created.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 13 Dec 2005 16:40:12 +0000
parents e8157fcb3114
children c9b51268668f
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, 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
173
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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 }