On Sat, Feb 16, 2013 at 12:00 PM, Jorge Chamorro
<[email protected]> wrote:
> On 16/02/2013, at 11:26, Trevor Norris wrote:
>
>> Sending a callback to nextTick is almost the functional equivalent of
>> running it at the end of your script. They are intentionally run before the
>> following event loop. Try sending a callback to setImmediate then one to
>> nextTick. The later will run first.
>
> setImmediate? In which node? So they did change the semantics of nextTick,
> again?
>
>
> @izs, ben, bert, fedor, nathan etc: Could you please tell us how does the
> event loop look like now, in pseudo code?
>
> while (RUN) {
>
> dispatch setImmediateQueue();
>
> dispatchPendingIO();
>
> dispatchTimers();
>
> dispatch nextTickQueue();
> }
>
> Please?
>
> TIA,
> --
> Jorge.
>From [1]:
do {
uv__update_time(loop);
uv__run_timers(loop);
uv__run_idle(loop);
uv__run_prepare(loop);
uv__run_pending(loop);
uv__io_poll(loop, (mode & UV_RUN_NOWAIT ? 0 : uv_backend_timeout(loop)));
uv__run_check(loop);
uv__run_closing_handles(loop);
r = uv__loop_alive(loop);
} while (r && !(mode & (UV_RUN_ONCE | UV_RUN_NOWAIT)));
process.nextTick() is backed by an idle handle, setImmediate() by a
check handle.
One difference between uv-win and uv-unix is that close callbacks run
at separate stages. On Windows, a handle's endgame may take several
ticks.
[1] https://github.com/joyent/libuv/blob/b6f72e5/src/unix/core.c#L288-298
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