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authorRich Felker <dalias@aerifal.cx>2014-08-25 16:38:25 -0400
committerRich Felker <dalias@aerifal.cx>2014-08-25 16:38:25 -0400
commit2ff714c6138da8abb50fd532503fd8d68a18811a (patch)
treed962f59e257148b70dbfd60284738e004d5b0d02 /src/prng/random.c
parent8b3d7d0d35f97051bc994800c928a7db53316dd2 (diff)
downloadmusl-2ff714c6138da8abb50fd532503fd8d68a18811a.tar.gz
spin in sem_[timed]wait before performing futex wait
empirically, this increases the maximum rate of wait/post operations between two threads by 20-150 times on machines I tested, including x86 and arm. conceptually, it makes sense to do some spinning because semaphores are intended to be usable as a notification mechanism between threads, not just as locks, and low-latency notification is a valuable property to have.
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