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annotate src/thread/epoc/SDL_syssem.cpp @ 1312:c9b51268668f

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Updated copyright information and removed rcs id lines (problematic in branch merges) I batch edited these files, so please let me know if I've accidentally removed anybody's credit here.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 01 Feb 2006 06:32:25 +0000
parents e8157fcb3114
children 604d73db6802
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
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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 /* Semaphore functions using the Win32 API */
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30
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31 //#include <stdio.h>
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32 //#include <stdlib.h>
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33 #include <e32std.h>
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34
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35 #include "SDL_error.h"
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36 #include "SDL_thread.h"
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37
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38
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39 #define SDL_MUTEX_TIMEOUT -2
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40
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41 struct SDL_semaphore
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42 {
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43 TInt handle;
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44 TInt count;
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45 };
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46
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47 extern TInt CreateUnique(TInt (*aFunc)(const TDesC& aName, TAny*, TAny*), TAny*, TAny*);
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48 extern TInt NewThread(const TDesC& aName, TAny* aPtr1, TAny* aPtr2);
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49
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50 TInt NewSema(const TDesC& aName, TAny* aPtr1, TAny* aPtr2)
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51 {
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52 TInt value = *((TInt*) aPtr2);
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53 return ((RSemaphore*)aPtr1)->CreateGlobal(aName, value);
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54 }
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55
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56 /* Create a semaphore */
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57 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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58 {
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59 RSemaphore s;
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60 TInt status = CreateUnique(NewSema, &s, &initial_value);
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61 if(status != KErrNone)
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62 {
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63 SDL_SetError("Couldn't create semaphore");
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64 }
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65 SDL_semaphore* sem = new /*(ELeave)*/ SDL_semaphore;
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66 sem->handle = s.Handle();
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67 sem->count = initial_value;
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68 return(sem);
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69 }
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70
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71 /* Free the semaphore */
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72 void SDL_DestroySemaphore(SDL_sem *sem)
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73 {
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74 if ( sem )
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75 {
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76 RSemaphore sema;
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77 sema.SetHandle(sem->handle);
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78 sema.Signal(sema.Count());
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79 sema.Close();
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80 delete sem;
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81 sem = NULL;
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82 }
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83 }
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84
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85
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86 struct TInfo
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87 {
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88 TInfo(TInt aTime, TInt aHandle) :
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89 iTime(aTime), iHandle(aHandle), iVal(0) {}
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90 TInt iTime;
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91 TInt iHandle;
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92 TInt iVal;
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93 };
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94
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95 TBool ThreadRun(TAny* aInfo)
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96 {
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97 TInfo* info = STATIC_CAST(TInfo*, aInfo);
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98 User::After(info->iTime);
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99 RSemaphore sema;
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100 sema.SetHandle(info->iHandle);
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101 sema.Signal();
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102 info->iVal = SDL_MUTEX_TIMEOUT;
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103 return 0;
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104 }
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105
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106
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107
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108
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109 void _WaitAll(SDL_sem *sem)
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110 {
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111 //since SemTryWait may changed the counter.
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112 //this may not be atomic, but hopes it works.
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113 RSemaphore sema;
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114 sema.SetHandle(sem->handle);
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115 sema.Wait();
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116 while(sem->count < 0)
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117 {
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118 sema.Wait();
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119 }
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120 }
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121
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122 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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123 {
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124 if ( ! sem ) {
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125 SDL_SetError("Passed a NULL sem");
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126 return -1;
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127 }
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128
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129 if ( timeout == SDL_MUTEX_MAXWAIT )
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130 {
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131 _WaitAll(sem);
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132 return SDL_MUTEX_MAXWAIT;
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133 }
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134
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135
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136 RThread thread;
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137
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138 TInfo* info = new (ELeave)TInfo(timeout, sem->handle);
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139
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140 TInt status = CreateUnique(NewThread, &thread, info);
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141
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142 if(status != KErrNone)
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143 return status;
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144
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145 thread.Resume();
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146
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147 _WaitAll(sem);
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148
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149 if(thread.ExitType() == EExitPending)
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150 {
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151 thread.Kill(SDL_MUTEX_TIMEOUT);
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152 }
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153
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154 thread.Close();
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155
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156 return info->iVal;
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157 }
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158
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159 int SDL_SemTryWait(SDL_sem *sem)
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160 {
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161 if(sem->count > 0)
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162 {
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163 sem->count--;
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164 }
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165 return SDL_MUTEX_TIMEOUT;
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166 }
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167
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168 int SDL_SemWait(SDL_sem *sem)
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169 {
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170 return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT);
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171 }
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172
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173 /* Returns the current count of the semaphore */
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174 Uint32 SDL_SemValue(SDL_sem *sem)
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175 {
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176 if ( ! sem ) {
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177 SDL_SetError("Passed a NULL sem");
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178 return 0;
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179 }
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180 return sem->count;
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181 }
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182
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183 int SDL_SemPost(SDL_sem *sem)
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184 {
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185 if ( ! sem ) {
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186 SDL_SetError("Passed a NULL sem");
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187 return -1;
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188 }
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189 sem->count++;
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190 RSemaphore sema;
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191 sema.SetHandle(sem->handle);
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192 sema.Signal();
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193 return 0;
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194 }