David 'Digit' Turner e1414aa96b libc: remove global lock from recursive mutex implementation.
This optimization improves the performance of recursive locks
drastically. When running the thread_stress program on a Xoom,
the total time to perform all operations goes from 1500 ms to
500 ms on average after this change is pushed to the device.

Change-Id: I5d9407a9191bdefdaccff7e7edefc096ebba9a9d
2012-01-30 10:13:41 +01:00
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