Thread.cxx
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上传日期:2013-07-25
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- /* ====================================================================
- * The Vovida Software License, Version 1.0
- *
- * Copyright (c) 2000 Vovida Networks, Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The names "VOCAL", "Vovida Open Communication Application Library",
- * and "Vovida Open Communication Application Library (VOCAL)" must
- * not be used to endorse or promote products derived from this
- * software without prior written permission. For written
- * permission, please contact vocal@vovida.org.
- *
- * 4. Products derived from this software may not be called "VOCAL", nor
- * may "VOCAL" appear in their name, without prior written
- * permission of Vovida Networks, Inc.
- *
- * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE AND
- * NON-INFRINGEMENT ARE DISCLAIMED. IN NO EVENT SHALL VOVIDA
- * NETWORKS, INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT DAMAGES
- * IN EXCESS OF $1,000, NOR FOR ANY INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
- * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
- * DAMAGE.
- *
- * ====================================================================
- *
- * This software consists of voluntary contributions made by Vovida
- * Networks, Inc. and many individuals on behalf of Vovida Networks,
- * Inc. For more information on Vovida Networks, Inc., please see
- * <http://www.vovida.org/>.
- *
- */
- static const char* const Thread_cxx_Version =
- "$Id: Thread.cxx,v 1.3 2001/04/10 02:12:50 icahoon Exp $";
- #include "Thread.hxx"
- #include "Runnable.hxx"
- #include "SignalHandler.hxx"
- #include "Application.hxx"
- #include "Lock.hxx"
- #include <cstdio>
- #include <cassert>
- using Vocal::Threads::Thread;
- using Vocal::Threads::Mutex;
- using Vocal::Threads::Lock;
- using Vocal::Signals::SignalHandler;
- using Vocal::Runnable;
- using Vocal::ReturnCode;
- Thread::ThreadMap * Thread::myThreadMap = 0;
- Mutex Thread::myThreadMapMutex;
- Thread * Thread::myMainThread = 0;
- extern "C"
- {
- static void *
- localThreadMain(void * data)
- {
- return ( Thread::threadMain(data) );
- }
- } // extern "C"
- void
- Thread::init()
- {
- Lock lock(myThreadMapMutex);
-
- if ( !myThreadMap )
- {
- myThreadMap = new map<vthread_t, Thread *>;
- myMainThread = new Thread;
- vthread_t mainThreadId = VThread::selfId();
-
- (*myThreadMap)[mainThreadId] = myMainThread;
- }
- }
- void
- Thread::uninit()
- {
- Lock lock(myThreadMapMutex);
- delete myThreadMap;
- myThreadMap = 0;
- delete myMainThread;
- myMainThread = 0;
- }
- Thread *
- Thread::self()
- {
- init();
-
- Lock lock(myThreadMapMutex);
- vthread_t id = VThread::selfId();
- assert( myThreadMap != 0 );
-
- ThreadMap::iterator it = myThreadMap->find(id);
-
- return ( it == myThreadMap->end() ? 0 : (*it).second );
- }
- vthread_t
- Thread::selfId()
- {
- return ( VThread::selfId() );
- }
- Thread::Thread(Runnable & runnable, const char * name)
- : myThread(new VThread),
- myRunnable(runnable),
- mySignalHandler(0),
- myName(name ? name : "thread")
- {
- init();
- myThread->spawn(localThreadMain, this);
- }
- Thread::~Thread()
- {
- const vthread_t * threadId = myThread->getId();
- if ( threadId )
- {
- Lock lock(myThreadMapMutex);
- if ( myThreadMap )
- {
- myThreadMap->erase(*threadId);
- }
- else
- {
- assert( myThreadMap != 0 );
- }
- }
- delete myThread;
-
- delete mySignalHandler;
- }
- ReturnCode
- Thread::join()
- {
- // Can't join from your own thread.
- //
- if ( this == self() )
- {
- return ( 0 );
- }
-
- ReturnCode rc = 0;
-
- if ( myThread )
- {
- rc = myThread->join();
- }
- return ( rc );
- }
- void
- Thread::exit()
- {
- // Can't exit unless this is the thread of execution.
- //
- if ( myThread == 0 || this != self() )
- {
- return;
- }
- myThread->exit();
- }
- Runnable &
- Thread::runnable()
- {
- return ( myRunnable );
- }
- SignalHandler &
- Thread::signalHandler()
- {
- assert( mySignalHandler != 0 );
- return ( *mySignalHandler );
- }
- ostream &
- Thread::writeTo(ostream & out) const
- {
- return ( out << myName.c_str() );
- }
- Thread::Thread()
- : myThread(0),
- myRunnable(Application::instance()),
- mySignalHandler(new SignalHandler),
- myName("main")
- {
- char buffer[64];
- sprintf(buffer, "%lu", (unsigned long)VThread::selfId());
- myName += '.';
- myName += buffer;
- }
- void *
- Thread::threadMain(void * data)
- {
- Thread * thread = (Thread *)data;
-
- if ( thread == 0 )
- {
- return ( (void *)1 );
- }
-
- const vthread_t * threadId = thread->myThread->getId();
- // Scope the lock for update of thread map only.
- //
- {
- Lock lock(myThreadMapMutex);
- if ( myThreadMap )
- {
- (*myThreadMap)[*threadId] = thread;
- }
- else
- {
- assert( myThreadMap != 0 );
- return ( (void *)1 );
- }
- }
- // Update name
- //
- char buffer[64];
- sprintf(buffer, "%lu", (unsigned long)*threadId);
- thread->myName += '.';
- thread->myName += buffer;
- // The signalHandler will persist for the lifetime of the run.
- //
- thread->mySignalHandler = new SignalHandler;
- void * rc = (void *)(thread->myRunnable.run());
- delete thread->mySignalHandler;
- thread->mySignalHandler = 0;
-
- return ( rc );
- }