回复: Is it safe to call ev_feed_event on an ev_timer in different thread?

[钱晓明]

so, I should use an extra ev_async to call ev_feed_event for that ev_timer? This ev_async in the same thread, and call ev_feed_event in its callback. 

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----- Reply message -----
发件人： "Marc Lehmann" <schmorp at schmorp.de>
收件人： "钱晓明" <mailtoantares at 163.com>
抄送： "libev" <libev at lists.schmorp.de>
主题： Is it safe to call ev_feed_event on an ev_timer in different thread?
日期： 周一, 8 月 27 日, 2012 年 12:50


On Sun, Aug 26, 2012 at 09:55:42PM +0800, 钱晓明 <mailtoantares at 163.com> wrote:
> Hi, is ev_feed_event is thread safe?

As long as you call it on the same loop only in one thread at a time, yes.

> I have an ev_timer installed in a loop within main thread, can I call
> ev_feed_event in another thread to simulate the time out event?

Not without locking the event loop, e.g. with a mutex (you could use the
acquire/release callbacks and an ev_async watcher to lock/unlock and wake
up the loop).

> Is it safe?

Without proper locking, no, it will most likely corrupt libev's internal
data structures and not even work.

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