022d303116
This patch provides several small optimizations to the implementation of mutex locking and unlocking. Note that a following patch will get rid of the global recursion lock, and provide a few more aggressive changes, I though it'd be simpler to split this change in two parts. + New behaviour: pthread_mutex_lock et al now detect recursive mutex overflows and will return EAGAIN in this case, as suggested by POSIX. Before, the counter would just wrap to 0. - Remove un-necessary reloads of the mutex value from memory by storing it in a local variable (mvalue) - Remove un-necessary reload of the mutex value by passing the 'shared' local variable to _normal_lock / _normal_unlock - Remove un-necessary reload of the mutex value by using a new macro (MUTEX_VALUE_OWNER()) to compare the thread id for recursive/errorcheck mutexes - Use a common inlined function to increment the counter of a recursive mutex. Also do not use the global recursion lock in this case to speed it up. Change-Id: I106934ec3a8718f8f852ef547f3f0e9d9435c816