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annotate src/thread/epoc/SDL_syssem.cpp @ 1790:828a17e05192

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Date: Mon, 8 May 2006 14:19:30 -0700 From: Bob Ippolito Subject: SDL trunk (r2346) and Mac OS X The current state of the trunk doesn't quite compile on Mac OS X, I've attached a series of patches that gets it to compile and kills a few warnings. sdl-trunk-r2346-dlcompat-warnings.diff: The dlcompat thing is just loaded with incorrect type signatures .. some of them have changed since 10.2 and others are just flat wrong. This puts it in sync with the latest headers. People on 10.2 will get the warnings instead of people with new kits.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 09 May 2006 07:26:58 +0000
parents 92947e3a18db
children
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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 }