sem_trywait returns EAGAIN (rather than returning -1 and setting errno)

[Robert Collins]

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" <cgf@redhat.com>
To: <cygwin@cygwin.com>
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



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