Additional methods for mutexes which support fair unlocking.
Fair unlocking means that a lock is handed directly over to the next waiting thread if there is one, without giving other threads the opportunity to "steal" the lock in the meantime. This is typically slower than unfair unlocking, but may be necessary in certain circumstances.
unsafe fn unlock_fair(&self)
unsafe fn bump(&self)
Temporarily yields the mutex to a waiting thread if there is one.
This method is functionally equivalent to calling
lock, however it can be much more efficient in the case where there
are no waiting threads.
This method may only be called if the mutex is held in the current context, see
the documentation of