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Use adaptive mutexes
The AdaptiveMutex is a wrapper around Mutex. We spin little bit, then lock. This may be more efficient than Mutex, while staying nice for hyperthreading. Idea by Xavier Leroy and Kaz Kylheku, in LinuxThread and NPTL libraries. Implementation adapted from http://code.metager.de/source/xref/gnu/glibc/nptl/pthread_mutex_lock.c
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