From: Yousong Zhou <yszhou4tech@gmail.com>
Date: Thu, 9 Jun 2016 02:20:32 +0000 (+0800)
Subject: uloop: use a waker for notifying sigchld and loop cancel events
X-Git-Url: http://git.archive.openwrt.org/?p=project%2Flibubox.git;a=commitdiff_plain;h=4e3a47a4cb438866bc4b9cb2f5d16226ffb48502;hp=4e3a47a4cb438866bc4b9cb2f5d16226ffb48502

uloop: use a waker for notifying sigchld and loop cancel events

Fix a race condition when do_sigchld, uloop_cancelled were set just
before epoll_wait(timeout=-1), resulting the loop stuck in the syscall
without noticing the events just happened

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
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