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POtrouble with boost error lock
 

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  1. POtrouble with boost error lock
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    <p>I can't figure out where is the problem with this simple code, I think that here is the trouble with output to Console maybe deadlock or something, can somebody, please help.</p> <pre><code>#include &lt;iostream&gt; #include &lt;string&gt; #include &lt;sstream&gt; #include &lt;boost/thread.hpp&gt; using namespace std; struct IntegrateTask { int id; double from, to, step, result; IntegrateTask(int id, double from, double to, double step) { this -&gt; id; this -&gt; from = from; this -&gt; to = to; this -&gt; step = step; } ~IntegrateTask() {} }; vector&lt;IntegrateTask&gt; * tasks = new vector&lt;IntegrateTask&gt;(); boost::mutex mutlist; boost::mutex iomutex; boost::condition_variable condtask; bool isInterrupted = false; double foo(double x) { return x * x; } void integrate(IntegrateTask * task) { double result = 0; double step = task -&gt; step; for(double i = task -&gt; from ; i != task -&gt; to; i =+ step) { result += foo(i) * step; } task -&gt; result = result; } void integrateThread() { boost::thread::id id = boost::this_thread::get_id(); try { { boost::mutex::scoped_lock iolock(iomutex); cout &lt;&lt; "Thread #" &lt;&lt; id &lt;&lt; " is working!" &lt;&lt; endl; } while(!isInterrupted) { IntegrateTask * currtask = NULL; { boost::mutex::scoped_lock lock(mutlist); while(!isInterrupted &amp;&amp; tasks -&gt; empty()) { condtask.wait(lock); } if (!tasks -&gt; empty()) { currtask = &amp;tasks-&gt;back(); tasks-&gt;pop_back(); } } if (currtask != NULL) { integrate(currtask); boost::mutex::scoped_lock iolock(iomutex); cout &lt;&lt; "Task #" &lt;&lt; (currtask-&gt;id) &lt;&lt; "; result = " &lt;&lt; (currtask-&gt;result) &lt;&lt; endl; } } boost::mutex::scoped_lock iolock(iomutex); cout &lt;&lt; "Thread # " &lt;&lt; id &lt;&lt; " stoped working normal!" &lt;&lt; endl; } catch(boost::thread_interrupted) { boost::mutex::scoped_lock ioLock(iomutex); cout &lt;&lt; "Thread # " &lt;&lt; id &lt;&lt; " stoped working by interruption!" &lt;&lt; endl; } catch(exception &amp; e) { boost::mutex::scoped_lock iolock(iomutex); cout &lt;&lt; "Error: " &lt;&lt; e.what() &lt;&lt; endl; } } int main() { cout &lt;&lt; "Function for integration: f(x)=x*x" &lt;&lt; endl; cout &lt;&lt; "For stopping program press EXIT" &lt;&lt; endl; int thcount = 6;// or boost::thread::hardware_concurrency() boost::thread_group thgroup; for (int i = 1; i &lt;= thcount; i++){ thgroup.create_thread(&amp;integrateThread); } int id = 0; while (true) { string line; { boost::mutex::scoped_lock iolock(iomutex); cout &lt;&lt; "Task #" &lt;&lt; ++id &lt;&lt; "; left bound, right bound and step: "; getline(cin, line); } if (line.find("e") != string::npos) { isInterrupted = true; condtask.notify_all(); thgroup.interrupt_all(); thgroup.join_all(); return 0; } double from, to, step; istringstream input(line); input &gt;&gt; from &gt;&gt; to &gt;&gt; step; IntegrateTask * task = new IntegrateTask(id, from, to, step); { boost::mutex::scoped_lock lock(mutlist); tasks-&gt;push_back(*task); } condtask.notify_one(); } } </code></pre>
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    1. CO-1: If you want to ask a good question, state clearly the nature of your problem. What is going wrong? Errors? There is no such thing as "maybe deadlock". Either it is a deadlock, then show the debugger's backtrace, or it isn't.
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    2. COAlso post code here, no links to googledoc or pastebin
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    3. COThe =+ in the for loop in integrate() probably should be a +=, aside from that see [thiton's comment](http://stackoverflow.com/questions/10321674/trouble-with-boost-error-lock#comment13288551_10321674).
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