1.7.15-1: pthread_cancel and pthread_kill not working as expected

Corinna Vinschen corinna-cygwin@cygwin.com
Wed May 23 08:53:00 GMT 2012

On May 22 15:25, Otto Meta wrote:
> >> Testcase cancel deferred:
> >> Works with 1.7.9 and 20120517 snapshot, fails (hangs) with 1.7.12-1
> >> and 1.7.15-1.
> > If that works in the snapshot anyway, I'm not going to look into that
> > one.
> It worked in the reduced testcase with sem_wait(). With read() it’s
> still half-broken. See below.
> >> Testcase cancel asynchronous:
> >> Async cancel seems to have no effect with any tested version.
> > I think I found a solution for this problem.  See the comment in the
> > patch at
> > http://sourceware.org/cgi-bin/cvsweb.cgi/src/winsup/cygwin/thread.cc.diff?cvsroot=src&r1=1.258&r2=1.259
> > Please test the today's developer snapshot.
> Asynchronous cancel seems to work as well as deferred cancel now. Thanks.
> Both cancel types work with sem_wait() and pause() now, but for threads
> blocked in read() they’re still unreliable. Only one of three blocked
> threads is killed in the attached updated testcases.

Just to let you know I'm working on it.  This will take some time.
During debugging I stumbled over a heisenbug.  As soon as I remove the
"Thread %i woke up just fine" printf from your test application, the
read function reurns with a "Bad address" error.  So far I have onlya
vague hunch what the cause may be.  Stay tuned.


Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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