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POsignal callback and pthread sync
 

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  1. POsignal callback and pthread sync
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    <p>On my app I have a pthread running a while(1) that read a socket client and a serial callback function. My app receive messages from a serial (like /dev/ttyS0) and receive messages from socket. The problem: the app crash after receive some messages from serial, on this moment the socket is receiving nothing. But if I comment the thread creation the app work fine.</p> <p>code draft:</p> <pre><code>// Socket Thread static void *Socket(void *arg) { // socket inicialization while (1) { ret = read(client, buffer, sizeof(buffer)-1); // do something } } // serial callback static void SerialCallback(int id, unsigned char *buffer, int length) { // do something } // main int main (void) { // start and configure serial callback cssl_start(); Serial = cssl_open(SERIAL_PORT, SerialCallback, 0, 115200, 8, 0, 1); // create the pthread // If I comment the line below the app work fine pthread_create(&amp;Thread_Socket, NULL, Socket, NULL); while (1) { } } </code></pre> <p>Notes:</p> <ul> <li><p>I use the library cssl (http://sourceforge.net/projects/cssl/) to deal with serial. This library use a real time signal.</p></li> <li><p>For tests purposes I use socat to generate pseudo-terminals (like /dev/pts/XX)</p></li> <li><p>The serial callback is called each time that serial receive one or more bytes</p></li> <li><p>I am using the cutecom to send messages to serial</p></li> </ul> <hr> <p>Added new tests information in 2012.07.16</p> <p>First test: I replace the line of read function by a while(1); and the problem follow (so, the problem is not related with read function).</p> <p>Second test: Using the full code (above example), I use two external usb/serial converter loopback connected, work rightly.</p>
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    1. USdsolimano
    1. USRicardo Crudo
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    1. COCan you provide the error/crash report?
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      1. USmathematician1975
    2. COno erros, quit silently.
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      1. POsignal callback and pthread sync
      1. USRicardo Crudo
    3. COThe signal delivery probably interrupts your `read(2)` in the socket-reading thread. Check the value of `errno(3)`. Is it `EINTR`?
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      1. POsignal callback and pthread sync
      1. USNikolai Fetissov
 

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