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POSelect() not Working in thread
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  1. POSelect() not Working in thread
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    copied!<p>I have to monitor a serial port and process its data. As a test program I was using select for just one port. The run function is as follows:</p> <pre><code>void &lt;ProtocolClass&gt;::run() { int fd = mPort-&gt;GetFileDescriptor(); fd_set readfs; int maxfd=1; int res; FD_ZERO(&amp;readfs); FD_SET(fd,&amp;readfs); struct timeval Timeout; Timeout.tv_usec=0; Timeout.tv_sec=3; //BYTE ack_message_frame[ACKNOWLEDGE_FRAME_SIZE]; while(true) { usleep(10); res=select(maxfd,&amp;readfs,NULL,NULL,NULL); if(res&lt;0) perror("\nselect failed"); else if( res==0) puts("TIMEOUT"); else if(FD_ISSET(fd,&amp;readfs)) {//IF INPUT RECEIVED qDebug("************RECEIVED DATA****************"); FlushBuf(); qDebug("\nReading data into a read buffer"); int bytes_read=mPort-&gt;ReadPort(mBuf,1000); mFrameReceived=false; for(int i=0;i&lt;bytes_read;i++) { qDebug("%x",mBuf[i]); } //if complete frame has been received, write the acknowledge message frame to the port. if(bytes_read&gt;0) { qDebug("\nAbout to Process Received bytes"); ProcessReceivedBytes(mBuf,bytes_read); qDebug("\n Processed Received bytes"); if(mFrameReceived) { int no_bytes=mPort-&gt;WritePort(mAcknowledgeMessage,ACKNOWLEDGE_FRAME_SIZE); }//if frame received }//if bytes read &gt; 0 } //if input received }//end while } </code></pre> <p>But the problem is it doesn't seemed to work as nothing happens. Can somebody suggest the correct way to do it. I want to use select per thread. Is this feasible. Can you give me a sample code to do it. I have searched the net but the examples are very basic involving just the main function. There are no C++ specific examples. I am using Qt threads by the way.</p> <p>Thanks</p>
 

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