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Date: Wed, 04 Mar 2009 03:49:21 +0000
From: Dave Korn <dave DOT korn DOT cygwin AT googlemail DOT com>
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Subject: Re: R: Cygwin PThreads bug?
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Marco Atzeri wrote:

> --- Mer 4/3/09, Nicholas Sherlock  ha scritto:

>> This C program:

>> Should run correctly. That is, the second call to
>> pthread_rwlock_rdlock should either succeed (returning
>> zero), having acquired the read lock a second time, or it
>> should fail and return EAGAIN, if the number of simultaneous
>> allowed read locks has been exceeded. It should not fail and
>> return EDEADLK (45), which it is currently doing. Am I
>> reading the spec wrong or is Cygwin non-conforming?

  Cygwin has a bug, your reading is correct.  Or, I should say, "had" a bug,
since:

> on 
> $ uname -a
> CYGWIN_NT-5.1 ITQMOZCAS2NB007 1.7.0(0.200/5/3) 2009-02-20 17:20 i686 Cygwin
> 
> compiled with gcc-4
> 
> $ ./pthread.exe 
> Err 0

  And with gcc3 as well; and neither compiler can make it work on 1.5.  So
it's a bug that was fixed sometime after 1.5 and before 1.7.

    cheers,
      DaveK


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