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POBoost::Thread access violation when calling join
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  1. POBoost::Thread access violation when calling join
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    copied!<p>I'm having some problems attempting to create a multi-threaded Server. Everything works fine until I need to remove a client from the server. </p> <p>The server is run in it's own thread, then each client has it's own thread as well.</p> <p>I'm using boost::thread for all the threads. When I need to stop the client I call </p> <pre><code>void StopClient() { assert(mThread); mStopMutex.lock(); mStopRequested = true; mStopMutex.unlock(); shutdown(mSocket,2); mThread-&gt;join(); } </code></pre> <p>Adding a breakpoint to the line</p> <pre><code>shutdown(mSocket,2); </code></pre> <p>I can see that mThread doesn't exist! Does this mean that the thread has already exited? Do you always need to call join() for a boost::thread?</p> <p>If I allow the code to run I get an access violation error.</p> <p><strong>Update</strong></p> <p>ServerThread</p> <pre><code>void StartServer() { assert(!mListenThread); mListenThread = boost::shared_ptr&lt;boost::thread&gt;(new boost::thread(boost::bind(&amp;ServerThread::Listen, this))); mUpdateThread = boost::shared_ptr&lt;boost::thread&gt;(new boost::thread(boost::bind(&amp;ServerThread::Update, this))); } void StopServer() { assert(mListenThread); mStopRequested = true; mMutex.lock(); for(int i = 0; i &lt; mClients.size(); i++ ) mClients[i]-&gt;StopClient(); mMutex.unlock(); mListenThread-&gt;join(); } void Listen() { while (!mStopRequested) { std::cout &lt;&lt; "Waiting for connection" &lt;&lt; std::endl; if(mClientSocket = accept( mServerSocket, (sockaddr*) &amp;mServerAddr, &amp;addrlen ) ) { mMutex.lock(); if( mClients.size() &gt; 0 ) { for( int i = 0; i &lt; mClients.size(); i++ ) { if( mClients[i]-&gt;getClientSocket() != mClientSocket ) { ClientThread newClient; newClient.Initialise(mClientSocket); mClients.push_back(&amp;newClient); mClients[mClients.size()-1]-&gt;StartClient(); break; } } } else { ClientThread newClient; newClient.Initialise(mClientSocket); mClients.push_back(&amp;newClient); mClients[mClients.size()-1]-&gt;StartClient(); } mMutex.unlock(); } } } void Update() { while (!mStopRequested) { mMutex.lock(); std::cout &lt;&lt; "::::Server is updating!::::" &lt;&lt; mClients.size() &lt;&lt; std::endl; for( int i = 0; i&lt; mClients.size(); i++ ) { if( !mClients[i]-&gt;IsActive() ) { mClients[i]-&gt;StopClient(); mClients.erase( mClients.begin() + i ); } } mMutex.unlock(); } } </code></pre> <p>ClientThread</p> <pre><code>void StartClient() { assert(!mThread); mThread = boost::shared_ptr&lt;boost::thread&gt;(new boost::thread(boost::bind(&amp;ClientThread::Update, this))); } void Update() { bool stopRequested; do { mStopMutex.lock(); stopRequested = mStopRequested; mStopMutex.unlock(); std::cout &lt;&lt; "lol" &lt;&lt; std::endl; if( mTimeOut &lt; 1000 ) { mTimeOut++; } else { mActive = false; } boost::this_thread::interruption_point(); } while( !stopRequested); } </code></pre>
 

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