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libmemif: timer causes spin at 100% cpu

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In case of timer is set and expires:
1. timer_fd is readable and stay readable.
2. timer_fd is part of epoll_fd set. This makes epoll_pwait()
   calls return immediately instead of sleeping.

Type: fix

Signed-off-by: Daniel Béreš <dberes@cisco.com>
Change-Id: I9b228464fe45b83def9b182c885d6febf428049c
This commit is contained in:
Daniel Béreš
2022-04-22 08:06:17 +00:00
committed by Damjan Marion
parent b95e6d4e75
commit c69655e3bd
1 changed files with 10 additions and 0 deletions
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10
extras/libmemif/src/main.c
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@ -409,6 +409,16 @@ memif_connect_handler (memif_fd_event_type_t type, void *private_ctx)
memif_socket_t *ms = (memif_socket_t *) private_ctx; memif_socket_t *ms = (memif_socket_t *) private_ctx;
memif_connection_t *c; memif_connection_t *c;
if (ms->timer_fd >= 0)
{
uint64_t u64;
/*
Have to read the timer fd else it stays read-ready
and makes epoll_pwait() return without sleeping
*/
read (ms->timer_fd, &u64, sizeof (u64));
}
/* loop ms->slave_interfaces and request connection for disconnected ones */ /* loop ms->slave_interfaces and request connection for disconnected ones */
TAILQ_FOREACH (c, &ms->slave_interfaces, next) TAILQ_FOREACH (c, &ms->slave_interfaces, next)
{ {