Simply because most CLI commands and API handlers are marked as not is_mp_safe,
hence they are actually protected by vlib_worker_thread_barrier_sync.
So to speak, node functions are temporally stopped and waiting when CLI/API is
being executed.
You should take a look at: vlib_worker_thread_barrier_sync/
vlib_worker_thread_barrier_release
Regards,
Kingwel
From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> On Behalf Of blankspot
Sent: Tuesday, January 15, 2019 3:00 PM
To: vpp-dev <vpp-dev@lists.fd.io>
Subject: [vpp-dev] About lock-free operation in policer
hi all,
I have a question about policer classify.
The code of bind/unbind a policer with interface is:
if (is_add)
pcm->classify_table_index_by_sw_if_index[ti][sw_if_index] = pct[ti];
else
pcm->classify_table_index_by_sw_if_index[ti][sw_if_index] = ~0;
and the code checking the value in "ip4-policer-classify" node is:
table_index0 =
pcm->classify_table_index_by_sw_if_index[tid][sw_if_index0];
There is no lock protecting the table index.
The function of policer is ok in multi-thread vpp, but I don't know why it is
lock-free.
Can any one help?
Thanks.
yonggong
-=-=-=-=-=-=-=-=-=-=-=-
Links: You receive all messages sent to this group.
View/Reply Online (#11919): https://lists.fd.io/g/vpp-dev/message/11919
Mute This Topic: https://lists.fd.io/mt/29122225/21656
Group Owner: vpp-dev+ow...@lists.fd.io
Unsubscribe: https://lists.fd.io/g/vpp-dev/unsub [arch...@mail-archive.com]
-=-=-=-=-=-=-=-=-=-=-=-
