How does libev invoke an io watcher if both EV_READ and EV_WRITE are pending?

[Marc Lehmann]

On Thu, Jul 30, 2015 at 11:48:00PM +0800, Cheyi Lin <cheyi.lin at gmail.com> wrote:
> If both EV_READ and EV_WRITE are pending, libev will ...
> 
> 1) invoke the callback twice, one is for EV_READ, the other is for EV_WRITE.
> 2) invoke the callback once, revents |= (EV_READ | EV_WRITE).
> 
> Which is correct? Thanks.

2 - watcher callbacks always receive _all_ pending events.

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