java code hang in closing serial port

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hi All,
i wrote code for auto port reading in java it is working fine in window as well as linux(red hat) but when i am testing it with suse linux it is hanging for particular port(COM3 and COM4)at the time of closing the port there is 70 com port showing when i am skiping these two port then it is checking all other port but only in case these two it is opening port sending the data closing input /output stream but when it coming closing serial port then code got hang even it is not giving any exception

so please help i tried google so much but still problem is same

thanks

Posted 9-Aug-11 19:35pm

harishankarjoshi

Updated 17-Mar-22 11:13am

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Nagy Vilmos 23-Aug-11 8:17am

Where is your code hanging?
Please edit the question and add a code snippet to give us mortals a chance.

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nameJulian · Answer 1 · 2013-05-16T21:00:00

I remember having somehow the same problem. Each time i would try and close the port, my program would just hang. Then i figured out that my closing method had to be synchronized. And did something like this:

Java

synchronized void closePort(){

      if(serialPort!=null){
            try{
        output.close();   //the streams need to be closed
        input.close();

        }catch(IOException ex){
                        //display whatever error message i want
        }

        serialport.close();
        serialport.removeEventListener();


      }



}

And this actually worked for me. It's not much, but i hope it will also work for you.
Best regards.

Member 15570218 · Answer 2 · 2022-03-17T11:13:00

I solve this hang chosing the time out port, works normaly that way, but hangs:
port.setComPortTimeouts(SerialPort.TIMEOUT_READ_SEMI_BLOCKING, 0, 0);
Change this seting at the routine of closing port ading this line code:
port.setComPortTimeouts(SerialPort.TIMEOUT_NONBLOCKING, 0, 0);
The port will close without hang the program, but you will cant reopen the port used, only restarting the program.

java code hang in closing serial port

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