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Re: Cygwin >= 1.7.6 open message queues - permission denied
On Oct 6 13:21, Corinna Vinschen wrote:
> On Oct 6 10:13, Manuel Wienand wrote:
> > Hi,
> >
> > I noticed that I get a permission denied error when I try to open a message queue in the same process or
> > in an other process.
> > The problem can be reproduced using the code given at: http://sourceware.org/ml/cygwin/2009-09/msg00629.html
>
> Confirmed. I'll investigate.
Fixed in CVS. While debugging I found a subtile synchronization problem
in the message queue implementation which apparently never was a problem
in W. Richard Stevens original implementation. Under some circumstances
a deadlock could occur because the Windows scheduler didn't give any
time to another process waiting for the same event object. I fixed that
now by splitting the single event object which was used to signal both,
a full as well as an empty queue. into two separate event objects. So,
that's why the fix took a while longer than anticipated.
Corinna
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Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Project Co-Leader cygwin AT cygwin DOT com
Red Hat
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