On 05/22/14 20:23, Chagin Dmitry wrote:
On Thu, May 22, 2014 at 01:06:22PM +0200, Hans Petter Selasky wrote:
When using the Linux Skype client under FreeBSD I sometimes see that the
Audio disappears in the one direction. When I check "ps auxw" I see
skype is stuck on a so-called Futex. I looked into the Linux futex code
and see that wakeup_one() is used instead of wakeup(). Maybe others can
test too and verify if replacing wakeup_one() by wakeup() makes any
difference in for Linux applications using Futexes.
generally speaking the patch is not correct as futex_wake() should
wakeup n waiters which is specified by user space. and i think that
futex_wake() is correct.
so we must take a close look at futex_requeue() and FUTEX_WAKE_OP.
I still see the issue with Skype, even when running with my small patch :-(
I'll try to profile the threads in Skype while it is running like
expected and observe any differences when it is not working, when I have
some more time, using kgdb. I guess td->td_slptick can be used to figure
out if a thread has been left behind, because Skype creates many threads ...
Thank you for your time!
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