Add pthread_barrier_t, pthread_barrierattr_t, pthread_barrier_destroy,
pthread_barrier_init, pthread_barrier_wait,
pthread_barrierattr_destroy, pthread_barrierattr_getpshared,
pthread_barrierattr_init, pthread_barrierattr_setpshared,
pthread_condattr_getclock, pthread_condattr_setclock,
pthread_getcpuclockid, pthread_mutex_timedlock,
pthread_rwlock_timedrdlock, pthread_rwlock_timedwrlock,
pthread_sigmask, pthread_spin_destroy, pthread_spin_init,
pthread_spin_lock, pthread_spin_trylock, and pthread_spin_unlock.