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Re: 1.7.8: mq_timedreceive() blocks, mq_receive() with O_NONBLOCK blocks, too
On Mar 3 12:13, Corinna Vinschen wrote:
> On Mar 3 10:57, Manuel Wienand wrote:
> > Hi,
> > I have a problem with the mqueues.
> > If I use mq_timedreceive() and do not set O_NONBLOCK, mq_timedreceive() blocks forever and eats 100% of one cpu core.
> > If I use mq_receive() and set O_NONBLOCK, mq_receive() blocks forever (0% cpu).
> Thanks for the testcase! I can reproduce it. I'm a bit out of
> spare time right now, but I think I'll have a fix soon. Stay tuned.
Ok, I applied a patch to fix the mq_timedreceive problem. mq_timedsend
was affected by this problem as well. I'm just generating a new
developer snapshot for testing.
The other problem is a PEBKAC, though. Here's the open call from your
testcase, which you used to reproduce the mq_receive block if O_NONBLOCK
is given. For clearness, I split the arguments into multiple lines:
msgQueue = mq_open(QUEUE_NAME,
O_RDWR | O_CREAT | O_EXCL,
S_IRWXU | S_IRWXG | O_NONBLOCK,
Do you see the problem?
Anyway, in the meantime the new snapshot has been uploaded. Please try
the latest developer snapshot from http://cygwin.com/snapshots/
Thanks again for the testcase. Debugging and fixing bugs is a lot more
fun with those.
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Project Co-Leader cygwin AT cygwin DOT com
Problem reports: http://cygwin.com/problems.html
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