Add EVENT_BASE_FLAG_EPOLL_DISALLOW_TIMERFD flag (fixes: #958)

By default we are using CLOCK_MONOTONIC_COARSE, but if
EVENT_BASE_FLAG_PRECISE_TIMER isset, then CLOCK_MONOTONIC will be used,
however this will also enable timerfd, while this is not always what
someone wants, hence add a flag to control this (by default the old
behavior is preserved, set new flag to change it).

1 files changed, 1 insertions, 0 deletions

diff --git a/epoll.c b/epoll.c
index a0df0d21..1d4393e6 100644
--- a/epoll.c
+++ b/epoll.c
@@ -189,6 +189,7 @@ epoll_init(struct event_base *base)
 	  event_base, we can try to use timerfd to give them finer granularity.
 	*/
 	if ((base->flags & EVENT_BASE_FLAG_PRECISE_TIMER) &&
+	    !(base->flags & EVENT_BASE_FLAG_EPOLL_DISALLOW_TIMERFD) &&
 	    base->monotonic_timer.monotonic_clock == CLOCK_MONOTONIC) {
 		int fd;
 		fd = epollop->timerfd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC);