tree af39dd631cf54c582437c3ce3c546e409b212e2a
parent f8beb4bedfdb11eca2f947afde79dd78b6386206
author Jorge E. Moreira <jemoreira@google.com> 1480727034 -0800
committer Nicolas Capens <capn@google.com> 1486154237 +0000

Modified MutexLock to use a pthread mutex on Android.

The BackoffLock spins idle for a while when waiting for a locked mutex
before yielding the core, thus wasting many CPU cycles. Modern pthread
implementations have low overhead mutexes which make the thread sleep
if the lock is already held, and efficiently resume them it becomes
available.

Change-Id: I26b64c86db620739671373fd0d82085744d34fa8
Reviewed-on: https://swiftshader-review.googlesource.com/8648
Reviewed-by: Nicolas Capens <capn@google.com>
Tested-by: Nicolas Capens <capn@google.com>