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adaptive_mutex now uses Boost.Atomic on all platforms that support lock-free atomics native waiting/notifying operations for unsigned int and pthreads on the other platforms. Windows always uses Boost.Atomic. The new implementation blocks the thread after a number of attempts to acquire the lock with spinning backoff. This should reduce CPU load if for some reason the thread that owns the lock is holding it for a long time (which typically should not happen, since adaptive_mutex is currently only used in threadsafe_queue, which doesn't hold the lock for too long, unless the holder gets preempted). The change may be significant on POSIX systems, which previously always used pthreads, and performance characteristics of pthread_mutex_t could have been different from our Boost.Atomic-based implementation.
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