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Protection from stale write events in epoll.

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Stale write event may happen if epoll_wait() reported both read and write
events, and processing of the read event closed descriptor.

Patch by Yichun Zhang (agentzh).
This commit is contained in:
Maxim Dounin 2011-11-22 17:02:21 +00:00
parent 0560ae55bc
commit 7f59728d5b
1 changed files with 12 additions and 0 deletions
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12
src/event/modules/ngx_epoll_module.c
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@ -681,6 +681,18 @@ ngx_epoll_process_events(ngx_cycle_t *cycle, ngx_msec_t timer, ngx_uint_t flags)
wev = c->write; wev = c->write;
if (c->fd == -1 || wev->instance != instance) {
/*
* the stale event from a file descriptor
* that was just closed in this iteration
*/
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"epoll: stale event %p", c);
continue;
}
if ((revents & EPOLLOUT) && wev->active) { if ((revents & EPOLLOUT) && wev->active) {
if (flags & NGX_POST_THREAD_EVENTS) { if (flags & NGX_POST_THREAD_EVENTS) {