Messages in this thread | | | Subject | Re: any fairness in NTPL pthread mutexes? | From | Lee Revell <> | Date | Mon, 31 Oct 2005 17:09:20 -0500 |
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On Mon, 2005-10-31 at 13:06 -0500, Lee Revell wrote: > On Mon, 2005-10-31 at 11:57 -0600, Christopher Friesen wrote: > > I'm using NPTL. > > > > If I have a pthread mutex currently owned by a task, and two other tasks > > try to lock it, when the mutex is unlocked, are there any rules about > > the order in which the waiting tasks get the mutex (ie priority, FIFO, > > etc.)? > > I believe it's currently FIFO in violation of POSIX which specifies > priority based wakeup. AIUI one of the main goals of the realtime & > robust mutexes work is to fix this.
Sorry this is wrong - the current behavior is allowed by POSIX for SCHED_OTHER but not SCHED_FIFO or _RR.
Lee
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