Mercurial > hg > nginx-quic
diff src/event/modules/ngx_epoll_module.c @ 6635:6acaa638fa07
Events: support for EPOLLEXCLUSIVE.
This flag appeared in Linux 4.5 and is useful for avoiding thundering herd
problem.
The current Linux kernel implementation walks the list of exclusive waiters,
and queues an event to each epfd, until it finds the first waiter that has
threads blocked on it via epoll_wait().
author | Valentin Bartenev <vbart@nginx.com> |
---|---|
date | Fri, 15 Jul 2016 15:18:57 +0300 |
parents | 18f6120e3b7a |
children | 75dbab4ea930 |
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--- a/src/event/modules/ngx_epoll_module.c +++ b/src/event/modules/ngx_epoll_module.c @@ -27,6 +27,7 @@ #define EPOLLRDHUP 0x2000 +#define EPOLLEXCLUSIVE 0x10000000 #define EPOLLONESHOT 0x40000000 #define EPOLLET 0x80000000 @@ -610,6 +611,12 @@ ngx_epoll_add_event(ngx_event_t *ev, ngx op = EPOLL_CTL_ADD; } +#if (NGX_HAVE_EPOLLEXCLUSIVE && NGX_HAVE_EPOLLRDHUP) + if (flags & NGX_EXCLUSIVE_EVENT) { + events &= ~EPOLLRDHUP; + } +#endif + ee.events = events | (uint32_t) flags; ee.data.ptr = (void *) ((uintptr_t) c | ev->instance);