Symbol: UMTX_OP_RW_WRLOCK
lib/libthr/thread/thr_umtx.c
314
return (_umtx_op_err(rwlock, UMTX_OP_RW_WRLOCK, 0, (void *)tm_size,
sys/kern/kern_umtx.c
4918
[UMTX_OP_RW_WRLOCK] = __umtx_op_rw_wrlock,