Symbol: UMTX_OP_MUTEX_TRYLOCK
lib/libthr/thread/thr_umtx.c
170
return (_umtx_op_err(mtx, UMTX_OP_MUTEX_TRYLOCK, 0, 0, 0));
sys/kern/kern_umtx.c
4909
[UMTX_OP_MUTEX_TRYLOCK] = __umtx_op_trylock_umutex,