[Rxtx] receive timeout under windows xp

[marcopar at gmail.com]

So? Is it a normal behavior? Is it a bug? Is it a known issue but can't 
be solved? Maybe i did something wrong? Suggestions?

marcopar at gmail.com wrote:
> Hi,
> i'm doing some test on the receive timeout behavior under windows xp pro 
> and i found some odd things.
> 
> Setting a value under 150000 everything works as expected, there's some 
> delay tough, the timeout triggers some seconds later.
> 
> This imprecision can be significant, for example if set it to 170000, i 
> have the timeout at 180000.
> But the big problem is that:
> if i set a timeout of 160000 the read timeouts after about 128000
> if i set a timeout of 180000 the read timeouts after about 16000 (yes, 
> 16sec)
> 
> There's no randomness in these values, everytime i have the same results.
> Same behaviour can be obtained in windows server 2003.
> 
> The same tests under Linux give results as expected with all values of 
> timeout and timeout triggers more precisely than on windows.
> 
> I'm using normal serial lines.
> I made the test with something connected to the line and without.
> 
> 
> 
> Here's the test code i'm using to do the tests:
> 
> public static void main(String args[]) {
>          try {
>              CommPortIdentifier portId = 
> CommPortIdentifier.getPortIdentifier("COM1");
>              RXTXPort serialPort = (RXTXPort) portId.open("yaya", 50);
>              serialPort.setSerialPortParams(115200, 
> SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
>              serialPort.enableReceiveTimeout(180000);
>              long t = System.currentTimeMillis();
>              int resp = serialPort.getInputStream().read();
>              t = System.currentTimeMillis() - t;
>              System.err.println(t + " " + resp);
>              serialPort.close();
>          } catch(Exception ex) {
>              ex.printStackTrace();
>          }
> }
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