Mercurial > ecos-v3_0-branch

annotate host/tools/Utils/common/eCosThreadUtils.cpp @ 2729:74dbf4c3f2e1 after-copyright-change-20090129

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Update all copyright banners to reflect FSF ownership; fix and improve licence text.
author jlarmour
date Thu, 29 Jan 2009 17:47:46 +0000
parents 94f334d9be6e
children
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1 // ####ECOSHOSTGPLCOPYRIGHTBEGIN####
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2 // -------------------------------------------
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3 // This file is part of the eCos host tools.
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4 // Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
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5 //
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6 // This program is free software; you can redistribute it and/or modify
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7 // it under the terms of the GNU General Public License as published by
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8 // the Free Software Foundation; either version 2 or (at your option) any
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9 // later version.
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10 //
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11 // This program is distributed in the hope that it will be useful, but
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12 // WITHOUT ANY WARRANTY; without even the implied warranty of
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13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 // General Public License for more details.
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15 //
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16 // You should have received a copy of the GNU General Public License
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17 // along with this program; if not, write to the
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18 // Free Software Foundation, Inc., 51 Franklin Street,
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19 // Fifth Floor, Boston, MA 02110-1301, USA.
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20 // -------------------------------------------
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21 // ####ECOSHOSTGPLCOPYRIGHTEND####
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22 #include "eCosThreadUtils.h"
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23 #include "eCosTrace.h"
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24
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25 CeCosThreadUtils::THREAD_ID CeCosThreadUtils::CS::nCSOwner=(CeCosThreadUtils::THREAD_ID)-1;
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26 int CeCosThreadUtils::CS::m_nCriticalSectionLock=0;
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27 #ifdef _WIN32
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28 CRITICAL_SECTION CeCosThreadUtils::CS::cs;
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29 bool CeCosThreadUtils::CS::bCSInitialized=false;
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30 #else // UNIX
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31 // Static recursive mutex for unix critical section
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32 #ifndef NO_THREADS
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33 pthread_mutex_t CeCosThreadUtils::CS::cs = PTHREAD_MUTEX_INITIALIZER;
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34 #endif
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35 #endif
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36
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38 CeCosThreadUtils::THREAD_ID CeCosThreadUtils::GetThreadId()
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39 {
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40 return
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41 #ifdef _WIN32
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42 GetCurrentThreadId();
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43 #else // UNIX
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44 #ifdef NO_THREADS
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45 42;
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46 #else
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47 pthread_self();
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48 #endif
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49 #endif
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50 }
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51
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52 // Wait for the specified Boolean to turn true or the timeout to occur
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53 // The value of the Boolean is returned as result
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54 bool CeCosThreadUtils::WaitFor (bool &b, Duration dTimeout)
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55 {
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56 Time t=Now();
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57 do {
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58 if(b){
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59 break;
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60 }
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61 Sleep(250);
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62 } while (Now()-t<dTimeout);
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63 return b;
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64 }
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65
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66 // This function spawns a thread and causes it to run asynchrously.
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67 // The callback may be
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68 // A function, which is called when the thread completes
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69 // A boolean, which is set when the thread completes
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70 // Null, in which case no notification is received of thread completion
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71 // pParam is passed to the thread function pThreadFunc on thread initiation.
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72
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73 bool CeCosThreadUtils::RunThread(CallbackProc *pThreadFunc, void *pParam, CallbackProc *pCompletionFunc, void *pCompletionParam, LPCTSTR pszName)
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74 {
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75 TRACE(_T("RunThread %s\n"),pszName);
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76 // Do not spawn a thread while in possession of a mutex
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77 // ENTERCRITICAL;
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78 // VTRACE(_T("csl=%d\n"),CS::m_nCriticalSectionLock);
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79 // assert(1==CS::m_nCriticalSectionLock);
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80 // LEAVECRITICAL;
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81
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82 ThreadInfo *pInfo=new ThreadInfo(pThreadFunc,pParam,pCompletionFunc,pCompletionParam,pszName); // SThreadFunc will delete
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83 bool rc=false;
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84
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85 #ifdef _WIN32
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86 // FIXME: CreateThread incompatible with C runtime calls?
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87 DWORD dwID;
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88 HANDLE hThread=CreateThread(NULL,0,SThreadFunc, pInfo, 0, &dwID);
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89 if(hThread){
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90 ::CloseHandle(hThread);
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91 rc=true;
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92 } else {
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93 ERROR(_T("Failed to create thread\n"));
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94 }
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95 #else // UNIX
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96 #ifdef NO_THREADS
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97 assert(false);
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98 #else
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99 pthread_t hThread;
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100 int n=pthread_create(&hThread, NULL, SThreadFunc, pInfo);
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101 TRACE( _T("RunThread: - non-blocking call (new thread=%x)\n"),hThread);
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102 if (n != 0) {
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103 ERROR(_T("RunThread(): pthread_create failed - %s\n"),strerror(errno));
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104 } else {
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105
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106 int n = pthread_detach(hThread);
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107
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108 if (0==n) {
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109 rc=true;
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110 } else {
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111 ERROR(_T("RunThread(): pthread_detach failed - %s\n"),strerror(errno));
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112 hThread=0;
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113 }
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114 }
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115 #endif
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116 #endif
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117 if(!rc){
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118 delete pInfo;
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119 }
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120 return rc;
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121
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122 }
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123
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124 #ifdef _WIN32
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125 int CALLBACK CeCosThreadUtils::FilterFunction(EXCEPTION_POINTERS *p)
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126 {
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127 EXCEPTION_RECORD *pRec =p->ExceptionRecord;
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128 TRACE(_T("!!!Exception!!! address=%08x code=%08x\n"),pRec->ExceptionAddress,pRec->ExceptionCode);
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129 /*
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130 CONTEXT *pContext=p->ContextRecord;
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131 const unsigned char *ESP=(const unsigned char *)pContext->Esp;
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132 for(int i=0;i<16;i++){
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133 TRACE(_T("%08X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X\n"),ESP,
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134 ESP[0],ESP[1],ESP[2],ESP[3],ESP[4],ESP[5],ESP[6],ESP[7],ESP[8],ESP[9],ESP[10],ESP[11],ESP[12],ESP[13],ESP[14],ESP[15]);
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135 ESP+=16;
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136 }
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137 */
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138 return EXCEPTION_EXECUTE_HANDLER;
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139 }
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140 #endif
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141
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142 CeCosThreadUtils::THREADFUNC CALLBACK CeCosThreadUtils::SThreadFunc (void *pParam)
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143 {
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144 THREAD_ID id=GetThreadId();
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145 ThreadInfo *pInfo=(ThreadInfo*)pParam;
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146 TRACE(_T("Thread %x [%s] created\n"),id,(LPCTSTR)pInfo->strName);
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147 #if defined(_WIN32) && !defined(__CYGWIN__)
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148 __try {
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149 // Call what we are instructed to (e.g. LocalThreadFunc):
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150 pInfo->pThreadFunc(pInfo->pThreadParam);
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151 }
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152 __except ( CeCosThreadUtils::FilterFunction(GetExceptionInformation() ))
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153 {
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154 TRACE(_T("Handling exception!!!...\n"));
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155 }
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156 #else // UNIX
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157 try {
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158 // Call what we are instructed to (e.g. LocalThreadFunc):
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159 pInfo->pThreadFunc(pInfo->pThreadParam);
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160 }
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161 catch (...){
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162 TRACE(_T("Exception caught in SThreadFunc!!!\n"));
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163 }
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164 #endif
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165
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166 // Call the Callback:
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167 if(pInfo->pCompletionFunc){
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168 pInfo->pCompletionFunc (pInfo->pCompletionParam);
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169 } else if (pInfo->pCompletionParam) {
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170 // No function - just a flag:
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171 *(bool *)pInfo->pCompletionParam=true;
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172 }
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173 // No more references to pInfo->pTest from now on...
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174 TRACE(_T("Thread %x [%s] terminated\n"),id,(LPCTSTR)pInfo->strName);
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175 delete pInfo;
76
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176 return 0;
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177 }
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178
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179 bool CeCosThreadUtils::CS::InCriticalSection()
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180 {
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181 return GetThreadId()==nCSOwner;
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182 }
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183
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184 int CeCosThreadUtils::AtomicIncrement (int &n)
76
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185 {
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186 int rc;
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187 ENTERCRITICAL;
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188 rc=n++;
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189 LEAVECRITICAL;
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190 return rc;
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191 }
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192
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193 int CeCosThreadUtils::AtomicDecrement (int &n)
76
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194 {
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195 int rc;
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196 ENTERCRITICAL;
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197 rc=n--;
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198 LEAVECRITICAL;
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199 return rc;
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200 }
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201
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202 CeCosThreadUtils::CS::CS()
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203 {
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204 // Get mutex lock; block until available unless current
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205 // thread already owns the mutex.
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206 if(!InCriticalSection()){
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207 #ifdef _WIN32
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208 if(!bCSInitialized){
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209 InitializeCriticalSection(&cs);
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210 bCSInitialized=true;
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211 }
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212 ::EnterCriticalSection(&cs);
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213 #else // UNIX
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214 #ifndef NO_THREADS
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215 pthread_mutex_lock(&cs);
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216 #endif
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217 #endif
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218 // As we now own the CS it is safe to perform the following assignment:
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219 nCSOwner=GetThreadId();
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220 }
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221 // As we now own the CS it is safe to perform the following increment:
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222 m_nCriticalSectionLock++;
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223 }
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224
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225 CeCosThreadUtils::CS::~CS()
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226 {
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227 assert(InCriticalSection());
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228 // As we own the CS we can safely manipulate variables:
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229 m_nCriticalSectionLock--;
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230 assert(m_nCriticalSectionLock>=0);
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231 if(0==m_nCriticalSectionLock){
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232 // Last lock is being released - let go of the mutex
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233 nCSOwner=(THREAD_ID)-1;
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234
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235 // Release mutex lock.
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236 #ifdef _WIN32
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237 ::LeaveCriticalSection(&cs);
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238 #else // UNIX
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239 #ifndef NO_THREADS
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240 pthread_mutex_unlock(&cs);
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241 #endif
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242 #endif
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243 }
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244 }
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245
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246 void CeCosThreadUtils::Sleep(int nMsec)
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247 {
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248 #ifdef _WIN32
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249 ::Sleep(nMsec);
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250 #else
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251 sched_yield();
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252 usleep((int)nMsec * 1000);
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253 #endif
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254 }