On 05/22/14 20:23, Chagin Dmitry wrote: > On Thu, May 22, 2014 at 01:06:22PM +0200, Hans Petter Selasky wrote: >> Hi, >> >> 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. > > Hi, 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! --HPSReceived on Thu May 22 2014 - 16:33:39 UTC
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