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The behavior of POSIX threads can be tuned to gain performance improvements
according to specific hardware capabilities and workload characteristics by
setting the following tunables in the pthread namespace:
The glibc.pthread.mutex_spin_count tunable sets the maximum number of times
a thread should spin on the lock before calling into the kernel to block.
Adaptive spin is used for mutexes initialized with the
PTHREAD_MUTEX_ADAPTIVE_NP GNU extension. It affects both
pthread_mutex_lock and pthread_mutex_timedlock.
The thread spins until either the maximum spin count is reached or the lock is acquired.
The default value of this tunable is ‘100’.