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From: Peter Rehley <peter AT rehley DOT net>
Subject: Re: pthreads, cygwin and pthread_mutex_lock not blocking
Date: Wed, 1 Jun 2005 17:22:59 -0700
To: cygwin AT cygwin DOT com
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On May 31, 2005, at 10:50 AM, David Rothenberger wrote:

> On 5/31/2005 10:15 AM, Peter Rehley wrote:
>> Well, here is a simple test case, but turns out I wasn't using the 
>> latest version.  I was having the problem on 1.5.12,  I haven't been 
>> able to get a good build with cygwin 1.5.17-1.  It builds and I can 
>> run the install script, but when I put the dll in place I see the 
>> message "cygheap magic number mismatch detected", and gcc doesn't 
>> want to work.
>
> I had a similar problem (see 
> <http://cygwin.com/ml/cygwin/2005-05/msg01251.html>). It turned out it 
> was because I was using the latest release of binutils. Try rolling 
> back to the previous release.
>
Ok, I rolled binutils to 20041229, rebuilt and copied the new dll.  
It's having the same issue that I see in 1.5.12.  When I debug the 
program, I see that the signal is being sent, but it doesn't get 
executed.

I've looked at the cygwin code, and I have noticed that the sleep 
(nanosleep) is calling pthread::cancelable_wait, and that will call 
WaitForMultipleObjects.  However, in pthread_mutex::_lock, it's only 
using WaitForSingleObject.  I'm wondering if something like 
WaitForMultipleObjects should be added to the lock function so that 
signals (SIGCHLD, in my case) can be handled.

It's just a guess since I'm not an expert with this code.

Enjoy,
Peter
-------------------------------
A Møøse once bit my sister


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