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vcl: fix libc epoll pwait starved

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We call vls_epoll_wait with 0 timeout to process unhandled_evts_vector
in ldp_epoll_pwait_eventfd. But vls_epoll_wait will then call
vppcom_epoll_wait_eventfd to process events in event queue. If there are
continuous events to be handled, then libc_epoll_pwait have no chance to be called.

Type: fix

Signed-off-by: wanghanlin <wanghanlin@corp.netease.com>
Change-Id: Ia4f61d0d438a3475bfde9f6715805274671d4e75
This commit is contained in:
wanghanlin
2021-03-18 20:00:41 +08:00
committed by Florin Coras
parent 156158f06d
commit 8919fec5ac
2 changed files with 5 additions and 1 deletions
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3
src/vcl/ldp.c
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@ -2516,7 +2516,8 @@ ldp_epoll_pwait_eventfd (int epfd, struct epoll_event *events,
ldpw->mq_epfd_added = 1;
}
rv = vls_epoll_wait (ep_vlsh, events, maxevents, 0);
/* Request to only drain unhandled to prevent libc_epoll_wait starved */
rv = vls_epoll_wait (ep_vlsh, events, maxevents, -2);
if (rv > 0)
goto done;
else if (PREDICT_FALSE (rv < 0))