Why can't I get this two-way ev_async example to work?

[Marc Lehmann]

On Fri, Nov 22, 2013 at 10:04:38PM +0800, Åke Kullenberg <ake.kullenberg at gmail.com> wrote:
> However when I run the program the slave thread's call to ev_async_send
> doesn't seem to register. The callback to master_cb_async is never invoked.
> 
> static void slave_cb_timeout(EV_P_ ev_timer *w, int revents) {
>         if (ev_async_pending(&async_to_master) == 0) {
>                 printf("    %s - sending async_send to loop\n", FUNC);
>                 ev_async_send(loop, &async_to_master);

The "loop" you refer to here is the parameter "loop" that EV_P_ declares.

If you change the last line to:

                extern struct ev_loop *loop;
                ev_async_send(loop, &async_to_master);

Then it should work (less ugly solution: rename the outer loop variable to
"loop1").

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