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Date: Tue, 28 Oct 2003 13:57:35 +0100
From: Thomas Pfaff <tpfaff AT gmx DOT net>
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To: Arash Partow <arashp AT hotmail DOT com>
CC: cygwin AT cygwin DOT com
Subject: Re: pthread problem with latest cygwin dll snapshot
References: <BAY9-F46Pj9P3efrOP50003160e AT hotmail DOT com>
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Arash Partow wrote:
> Greetings to Thomas and all others involved in cygwin pthreads
> implementation,
> 
> I've downloaded the snapshots of cygwin1.dll (cygwin1-20031025.dll.bz2 and
> cygwin1-20031027.dll.bz2), I think the prior is the one where Thomas made
> changes and in the latter Corinna made changes to semaphores which I don't
> how that might effect pthreads. In both cases the stress test can run
> successfully under certain circumstances (which for normal application
> execution are not acceptable) in-one instance reaching 9million+ thread
> creations, however if one tries to do other things like edit a text file or
> play an mp3 or some other task, the Thread-Test will crash. In GDB the call
> stack shows the last call before the crash was to the cygwin1.dll, also
> sometimes if you try to restart the Thread-Test right after it has crashed,
> the new instance crashes almost immediately only ever getting up to about
> ~5000 thread creations.

Hi Arash,

this time i am not able to reproduce your problem.

Before i continue debugging i suggest that you check the return codes of 
some pthread API functions first and call the pthread_functions only 
with a valid thread id.

For example change

void Thread::start()
{
    pthread_create(&threadID,NULL,&(Thread::threadFunction),this);
    pthread_detach(threadID);
}

to

void Thread::start()
{
   int res;
   res = pthread_create(&threadID,NULL,&(Thread::threadFunction),this);
   if (res)
     setThreadState(THREAD_DEAD);
   else
     pthread_detach(threadID);
}

Please contact me if this still doesn't help.

Thomas


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