Symbol: UMTX_OP_RW_RDLOCK
lib/libthr/thread/thr_umtx.c
294
return (_umtx_op_err(rwlock, UMTX_OP_RW_RDLOCK, flags,
sys/kern/kern_umtx.c
4917
[UMTX_OP_RW_RDLOCK] = __umtx_op_rw_rdlock,
usr.bin/kdump/kdump.c
1544
case UMTX_OP_RW_RDLOCK: