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Date: Wed, 03 Nov 2004 07:27:41 +0800
From: David Xu <davidxu@freebsd.org>
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To: John Baldwin <jhb@freebsd.org>
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cc: Julian Elischer <julian@elischer.org>
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Subject: Re: cvs commit: src/lib/libpthread/thread thr_private.h thr_sig.c
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John Baldwin wrote:

>On Monday 01 November 2004 06:04 pm, David Xu wrote:
>  
>
>>Not every important,  I think I have another very important history
>>bug in hand,  did you get my "fix famous libpthread conditional
>>variable race condition" mail ? :-)
>>    
>>
>
>Oooo, can I test it please?  We are still having problems with mono on HEAD 
>here at work.  I tried merging the changes in uthread_cond.c 1.32 to 
>libpthread but that seemed to make it worse.  The problems seem to be that a 
>signal handler is being run when the SYNCQ sflag is set (but the thread is 
>not on a cv or a mutex queue), and the handler calls sem_post() which is 
>supposed to be signal safe.  sem_post() tries to lock a mutex and then bombs 
>with the assertion failure.
>
>  
>
You can try:
http://people.freebsd.org/~davidxu/kse/thr_cond.c.diff

But it was not designed to fix the problem you have seen. :-)