From owner-freebsd-java  Sun Oct  7  7: 4:42 2001
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Date: Sun, 7 Oct 2001 16:04:33 +0200
From: "Remco van 't Veer" <rwvtveer@xs4all.nl>
To: FreeBSD Java List <freebsd-java@FreeBSD.ORG>
Subject: jdk1.3.1p4_1: java.lang.Process blocks Thread.sleep() and Object.wait()
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Hi,

The following code does not work as expected:

    public class Y
    {
	public static void main (String[] args)
	throws Exception
	{
	    String[] pargs = { "sleep", "10" };
	    try
	    {
		Runtime.getRuntime().exec(pargs);
	    }
	    catch (java.io.IOException ex) { }
	    System.out.println("Sleep process is running..");
	    System.out.println("Now this thread will print a . every second");

	    for (int i = 0; i < 10; i++)
	    {
		Thread.currentThread().sleep(1000);
		System.out.print(".");
	    }
	    System.out.println(".");
	}
    }

The current thread will no wake up until the executed process has
finished.  The native 1.2.2 port and the linux jdk 1.3.1 both behave
as expected.  It takes them 10 seconds to execute this code.  On the
native 1.3.1 port this class takes 20 seconds to finish.

Further investigation revealed something which may be of interest.
Replacing:

    Thread.currentThread().sleep(1000);

with:

    Object o = new Object();
    synchronized (o)
    {
	o.wait(1000);
    }

shows the same problem.

BTW great port!  It's starts up and runs very fast!  Great work!

TIA,
Remco


--
scilla: not so pure java media server <http://www.xs4all.nl/~rwvtveer/scilla/>

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