Messages in this thread | | | Date | Sat, 26 Apr 2014 13:04:37 +0200 | From | Peter Zijlstra <> | Subject | Re: [RFC PATCH] rtmutex: Do not prio boost when timeout is used |
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On Fri, Apr 25, 2014 at 04:28:48PM -0400, Steven Rostedt wrote: > I've been discussing an issue on IRC with deadlock checking and found > something wrong with it. Mainly, if any of the locks have a timeout, > then even if the chain loops, there is no real deadlock. If one of the > locks in the chain times out, then things will move forward again.
POSIX (opengroup):
http://pubs.opengroup.org/onlinepubs/009695399/functions/pthread_mutex_timedlock.html
Explicitly states that pthread_mutex_timedlock() should participate in the PI chain, it also states that its perfectly valid for this function to return -EDEADLK.
Therefore, there's nothing wrong. If this behaviour breaks userspace, its already broken for not actually expecting the right thing.
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