[Bug nptl/21422] Deadlock in 2.25 pthread_cond_broadcast after process abort

["florian.schmidt at dlr dot de" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21422

Florian Schmidt <florian.schmidt at dlr dot de> changed:

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                 CC|                            |florian.schmidt at dlr dot de

--- Comment #12 from Florian Schmidt <florian.schmidt at dlr dot de> ---
i also stumbled upon this, and missed this report before reporting to my
distribution: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=884776

i changed our communication middleware to now use futex-syscalls on linux.

this lib is used cross-platform. i already had my own (hacky) condition
variable impl for win32 and vxworks. the QNX pshared condvar worked as expected
out-of-the box (they don't mention robust variants at all...).

i did had some strange behaviour with the old pshared condvar on linux (i think
it was related to pthread_cond_destroy()'ing them...) 

so our code base grew another special case for signaling waiters. i like the
futex based special case, i hope it will behave much better than the old impl.

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