tree 8772d1e3225b5475459442face25454cecd1a2fe
parent 815f2a093a4b44863fe9ffdb1986a2d5425ffef8
author John Reck <jreck@google.com> 1427225504 -0700
committer John Reck <jreck@google.com> 1427225504 -0700

Shave another 10us off of hwuitask

pthread_cond_signal does not need the mutex
to be held to signal. This results in the thread
waking up trying to grab the lock, failing, the signaling
thread to wake up, release the lock, immediately get preempted
for the signaled thread which can now proceed.

Release the mutex before signaling to avoid the ping-pong
scheduling issue, which shaves another 10us off of this

Change-Id: Ie6bccca031ba6528f357eae8352b74626a6318c7