__mtx_unlock_sleep
__mtx_unlock_sleep(volatile uintptr_t *c, uintptr_t v)
__mtx_unlock_sleep(c, (uintptr_t)curthread, opts, file, line);
void __mtx_unlock_sleep(volatile uintptr_t *c, uintptr_t v, int opts,
void __mtx_unlock_sleep(volatile uintptr_t *c, uintptr_t v);
__mtx_unlock_sleep(&(m)->mtx_lock, v, o, f, l)
__mtx_unlock_sleep(&(m)->mtx_lock, v)