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annotate src/thread/epoc/SDL_syssem.cpp @ 1845:548445edaf9f

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author Sam Lantinga <slouken@libsdl.org>
date Wed, 17 May 2006 04:36:31 +0000
parents 92947e3a18db
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 /*
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25 SDL_syssem.cpp
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26
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27 Epoc version by Markus Mertama (w@iki.fi)
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28 */
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29
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30 /* Semaphore functions using the Win32 API */
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31
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32 #include <e32std.h>
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33
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34 #include "SDL_error.h"
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35 #include "SDL_thread.h"
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36
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37
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38 #define SDL_MUTEX_TIMEOUT -2
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39
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40 struct SDL_semaphore
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41 {
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42 TInt handle;
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43 TInt count;
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44 };
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45
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46 extern TInt CreateUnique(TInt (*aFunc)(const TDesC& aName, TAny*, TAny*), TAny*, TAny*);
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47 extern TInt NewThread(const TDesC& aName, TAny* aPtr1, TAny* aPtr2);
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48
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49 TInt NewSema(const TDesC& aName, TAny* aPtr1, TAny* aPtr2)
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50 {
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51 TInt value = *((TInt*) aPtr2);
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52 return ((RSemaphore*)aPtr1)->CreateGlobal(aName, value);
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53 }
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54
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55 /* Create a semaphore */
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56 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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57 {
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58 RSemaphore s;
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59 TInt status = CreateUnique(NewSema, &s, &initial_value);
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60 if(status != KErrNone)
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61 {
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62 SDL_SetError("Couldn't create semaphore");
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63 }
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64 SDL_semaphore* sem = new /*(ELeave)*/ SDL_semaphore;
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65 sem->handle = s.Handle();
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66 sem->count = initial_value;
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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 void SDL_DestroySemaphore(SDL_sem *sem)
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72 {
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73 if ( sem )
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74 {
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75 RSemaphore sema;
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76 sema.SetHandle(sem->handle);
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77 sema.Signal(sema.Count());
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78 sema.Close();
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79 delete sem;
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80 sem = NULL;
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81 }
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82 }
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83
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84
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85 struct TInfo
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86 {
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87 TInfo(TInt aTime, TInt aHandle) :
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88 iTime(aTime), iHandle(aHandle), iVal(0) {}
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89 TInt iTime;
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90 TInt iHandle;
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91 TInt iVal;
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92 };
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93
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94 TBool ThreadRun(TAny* aInfo)
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95 {
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96 TInfo* info = STATIC_CAST(TInfo*, aInfo);
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97 User::After(info->iTime);
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98 RSemaphore sema;
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99 sema.SetHandle(info->iHandle);
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100 sema.Signal();
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101 info->iVal = SDL_MUTEX_TIMEOUT;
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102 return 0;
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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
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108 void _WaitAll(SDL_sem *sem)
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109 {
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110 //since SemTryWait may changed the counter.
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111 //this may not be atomic, but hopes it works.
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112 RSemaphore sema;
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113 sema.SetHandle(sem->handle);
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114 sema.Wait();
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115 while(sem->count < 0)
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116 {
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117 sema.Wait();
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118 }
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119 }
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120
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121 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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122 {
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123 if ( ! sem ) {
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124 SDL_SetError("Passed a NULL sem");
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125 return -1;
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126 }
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127
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128 if ( timeout == SDL_MUTEX_MAXWAIT )
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129 {
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130 _WaitAll(sem);
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131 return SDL_MUTEX_MAXWAIT;
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132 }
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133
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134
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135 RThread thread;
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136
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137 TInfo* info = new (ELeave)TInfo(timeout, sem->handle);
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138
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139 TInt status = CreateUnique(NewThread, &thread, info);
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140
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141 if(status != KErrNone)
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142 return status;
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143
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144 thread.Resume();
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145
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146 _WaitAll(sem);
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147
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148 if(thread.ExitType() == EExitPending)
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149 {
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150 thread.Kill(SDL_MUTEX_TIMEOUT);
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151 }
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152
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153 thread.Close();
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154
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155 return info->iVal;
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156 }
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157
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158 int SDL_SemTryWait(SDL_sem *sem)
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159 {
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160 if(sem->count > 0)
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161 {
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162 sem->count--;
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163 }
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164 return SDL_MUTEX_TIMEOUT;
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165 }
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166
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167 int SDL_SemWait(SDL_sem *sem)
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168 {
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169 return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT);
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170 }
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171
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172 /* Returns the current count of the semaphore */
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173 Uint32 SDL_SemValue(SDL_sem *sem)
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174 {
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175 if ( ! sem ) {
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176 SDL_SetError("Passed a NULL sem");
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177 return 0;
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178 }
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179 return sem->count;
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180 }
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181
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182 int SDL_SemPost(SDL_sem *sem)
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183 {
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184 if ( ! sem ) {
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185 SDL_SetError("Passed a NULL sem");
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186 return -1;
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187 }
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188 sem->count++;
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189 RSemaphore sema;
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190 sema.SetHandle(sem->handle);
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191 sema.Signal();
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192 return 0;
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193 }