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POPthread_create error 11 with only 5 simultaneous thread
 

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  1. POPthread_create error 11 with only 5 simultaneous thread
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    <p>I have a problem in a multi threaded program. My program has 4 threads that are always here. We will name these thread from 1 to 4.</p> <p>The goal for my program is to communicate on a socket with a peripheral. Thread number 4 is used to send the messages to the peripheral.</p> <p>Each time a message is sent to the peripheral, I use : </p> <p><code>pthread_create(&amp;m_hThreadMsgReader, NULL, &amp;ThreadMsgReader, (void*) &amp;argStruct);</code></p> <p>This will create a thread to listen to the response on the socket, this thread will return when the socket doesn't contain anymore message : ie if<code>iRet = recv(m_iSocket, pcRecBuf, DEFAULT_READ_DATA_LEN, 0);</code> makes iRet take the value 0.</p> <p>So with the current implementation, a data pooling is made (every minute) on the peripheral (aside from other command sent via user input).</p> <p>The problem here is that after a few hours, pthread create will crash with an error 11. I've seen on stack overflow that it means that the system might not have enough resources or too many threads.</p> <p>But I don't understand as in QtCreator debug, i can only see the thread from 1 to 4. I know I might have created like 300 threads, but the list of thread only contains 4, which means all other threads were terminated.</p> <p>So I don't really understand if the maximum number of thread creation is during the whole lifetime of the process or the number of thread present at the same time.</p> <p>Should I just find a way to have a single thread for the listening even if it will listen on a empty socket ? Is my implementation a bad pattern ?</p>
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    1. COCrashing with "error 11" is segmentation fault. It _probably_ have nothing to do with resource scarcity of any kind, but you accessing a pointer you shouldn't access. Of course, this will happen when, for example, a memory allocation fails and you don't check the returned pointer.
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    2. COSimilar question asked here, http://stackoverflow.com/questions/622890/why-would-pthread-create-fail-with-only-2-threads-active?rq=1
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    3. CODidn't find it the first time Divyang, I am going to try it, thanks for the pointer, I'll get back to you when I know if it worked
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