Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner AT cygwin DOT com Delivered-To: mailing list cygwin AT cygwin DOT com Message-ID: <026f01c1bea9$3963b230$0200a8c0@lifelesswks> From: "Robert Collins" To: References: <005d01c1be6d$b9c6a2c0$6401a8c0 AT dopeslap2k> <20020226061305 DOT GA7735 AT redhat DOT com> Subject: Re: sem_trywait returns EAGAIN (rather than returning -1 and setting errno) Date: Tue, 26 Feb 2002 20:37:35 +1100 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 X-OriginalArrivalTime: 26 Feb 2002 09:36:34.0782 (UTC) FILETIME=[149F4FE0:01C1BEA9] I haven't done much work on the sem* functions to date, other than keeping the functional. Patches, as always, gratefully accepted. Post daemon merge I can do a review of the sem* functions. The problem should _not_ be endemic in the pthreads code, as I rewrote nearly all the pthread* functions from the P1003.1 draft spec. Rob === ----- Original Message ----- From: "Christopher Faylor" To: Sent: Tuesday, February 26, 2002 5:13 PM Subject: Re: sem_trywait returns EAGAIN (rather than returning -1 and setting errno) > On Mon, Feb 25, 2002 at 09:31:41PM -0500, Andrew T. Schnable wrote: > >I was doing some pthreads/semaphore work and I tracked down a problem > >in my code to a bug in sem_trywait. Posix sem_trywait is defined as > >returning -1 and setting errno to EAGAIN if the semaphore would have > >blocked. The cygwin implementation returns EAGAIN an leaves errno > >unchanged. > > > >Has anyone else encountered this problem and provided a fix? > > Hmm. Unless I am missing something, it looks like this problem is > prevalent in the pthreads code. It makes me think that maybe the > author meant to catch these kinds of things in the interface between > the __pthread/pthread calls. > > Robert, can you explain what's going on here? > > cgf -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Bug reporting: http://cygwin.com/bugs.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/