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From: Bryce McKinlay <bryce@albatross.co.nz>
To: Jeff Sturm <jsturm@sigma6.com>
Cc: Kresten Krab Thorup <krab@eos.dk>, java-discuss@sourceware.cygnus.com
Subject: Re: Thread.interrupt()
Date: Tue, 14 Mar 2000 14:16:00 -0000	[thread overview]
Message-ID: <38CEBB1B.F3BAD00E@albatross.co.nz> (raw)
In-Reply-To: <38CE44FB.F07DC4D0@sigma6.com>

Jeff Sturm wrote:

> IOW, Sun crippled their API because Win32 doesn't handle interruptable
> I/O portably.  Not a good policy.
>
> Since Java doesn't support read() with timeouts either, it is easy to
> create a "stuck" thread that can never die.

Well, according to the JDK 1.2 API docs, it does for socket reads. We don't
implement this properly yet, though.

public void setSoTimeout(int timeout)
                  throws SocketException

... "With this option set to a non-zero timeout, a read() call on the
InputStream associated with this Socket will block for only this amount of
time. If the timeout expires, a java.io.InterruptedIOException is raised,
though the Socket is still valid. " ...

On the other hand, the behaviour of interrupt() was never well-specified.
Another way to unstick a blocked thread is to close the underlying socket
from another thread. Arguably, a good interrupt() implementation would be
better though.

regards

  [ bryce ]


WARNING: multiple messages have this Message-ID

From: Bryce McKinlay <bryce@albatross.co.nz>
To: Jeff Sturm <jsturm@sigma6.com>
Cc: Kresten Krab Thorup <krab@eos.dk>, java-discuss@sourceware.cygnus.com
Subject: Re: Thread.interrupt()
Date: Sat, 01 Apr 2000 00:00:00 -0000	[thread overview]
Message-ID: <38CEBB1B.F3BAD00E@albatross.co.nz> (raw)
Message-ID: <20000401000000.Si4119zoJYC82OVlvwiTAHnDCF9DilbHTX19KEGhzHo@z> (raw)
In-Reply-To: <38CE44FB.F07DC4D0@sigma6.com>

Jeff Sturm wrote:

> IOW, Sun crippled their API because Win32 doesn't handle interruptable
> I/O portably.  Not a good policy.
>
> Since Java doesn't support read() with timeouts either, it is easy to
> create a "stuck" thread that can never die.

Well, according to the JDK 1.2 API docs, it does for socket reads. We don't
implement this properly yet, though.

public void setSoTimeout(int timeout)
                  throws SocketException

... "With this option set to a non-zero timeout, a read() call on the
InputStream associated with this Socket will block for only this amount of
time. If the timeout expires, a java.io.InterruptedIOException is raised,
though the Socket is still valid. " ...

On the other hand, the behaviour of interrupt() was never well-specified.
Another way to unstick a blocked thread is to close the underlying socket
from another thread. Arguably, a good interrupt() implementation would be
better though.

regards

  [ bryce ]


  parent reply	other threads:[~2000-03-14 14:16 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2000-04-01  0:00 Thread.interrupt() Bryce McKinlay
2000-03-13 13:33 ` Thread.interrupt() Bryce McKinlay
2000-03-14  2:24   ` Thread.interrupt() Kresten Krab Thorup
2000-03-14  3:26     ` Thread.interrupt() Bryce McKinlay
2000-04-01  0:00       ` Thread.interrupt() Bryce McKinlay
2000-03-14  5:52     ` Thread.interrupt() Jeff Sturm
2000-03-14 11:02       ` Thread.interrupt() Tom Tromey
2000-04-01  0:00         ` Thread.interrupt() Tom Tromey
2000-03-14 14:16       ` Bryce McKinlay [this message]
2000-03-14 16:09         ` Thread.interrupt() Godmar Back
2000-04-01  0:00           ` Thread.interrupt() Godmar Back
2000-04-01  0:00         ` Thread.interrupt() Bryce McKinlay
2000-04-01  0:00       ` Thread.interrupt() Jeff Sturm
2000-04-01  0:00     ` Thread.interrupt() Kresten Krab Thorup
2000-04-01  0:00   ` Thread.interrupt() Bryce McKinlay
  -- strict thread matches above, loose matches on Subject: below --
2000-03-16  4:08 Thread.interrupt() Miles Sabin
2000-04-01  0:00 ` Thread.interrupt() Miles Sabin
2000-03-15 13:52 Thread.interrupt() Boehm, Hans
2000-04-01  0:00 ` Thread.interrupt() Boehm, Hans
2000-03-15 13:06 Thread.interrupt() Miles Sabin
2000-04-01  0:00 ` Thread.interrupt() Miles Sabin
2000-03-15 12:55 Thread.interrupt() Boehm, Hans
2000-04-01  0:00 ` Thread.interrupt() Boehm, Hans
2000-03-15 11:57 Thread.interrupt() Miles Sabin
2000-04-01  0:00 ` Thread.interrupt() Miles Sabin
2000-03-15 11:38 Thread.interrupt() Boehm, Hans
2000-04-01  0:00 ` Thread.interrupt() Boehm, Hans
2000-03-15  5:51 Thread.interrupt() Miles Sabin
2000-04-01  0:00 ` Thread.interrupt() Miles Sabin
2000-03-14 16:30 Thread.interrupt() Boehm, Hans
2000-03-14 17:17 ` Thread.interrupt() Jesper Peterson
2000-03-14 17:27   ` Thread.interrupt() Tom Tromey
2000-04-01  0:00     ` Thread.interrupt() Tom Tromey
2000-04-01  0:00   ` Thread.interrupt() Jesper Peterson
2000-04-01  0:00 ` Thread.interrupt() Boehm, Hans
2000-03-14 11:26 Thread.interrupt() Boehm, Hans
2000-04-01  0:00 ` Thread.interrupt() Boehm, Hans
2000-03-14  9:57 Thread.interrupt() Boehm, Hans
2000-03-14 10:52 ` Thread.interrupt() Tom Tromey
2000-04-01  0:00   ` Thread.interrupt() Tom Tromey
2000-03-14 15:59 ` Thread.interrupt() Jesper Peterson
2000-04-01  0:00   ` Thread.interrupt() Jesper Peterson
2000-04-01  0:00 ` Thread.interrupt() Boehm, Hans
2000-03-14  7:47 Thread.interrupt() Miles Sabin
2000-04-01  0:00 ` Thread.interrupt() Miles Sabin
2000-03-14  6:00 Thread.interrupt() Miles Sabin
2000-03-14  7:36 ` Thread.interrupt() Jeff Sturm
2000-03-14 10:58   ` Thread.interrupt() Tom Tromey
2000-04-01  0:00     ` Thread.interrupt() Tom Tromey
2000-04-01  0:00   ` Thread.interrupt() Jeff Sturm
2000-04-01  0:00 ` Thread.interrupt() Miles Sabin

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