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util.async: Add next-tick configuration

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Running woken runners in the next iteration of the event loop prevents
unexpected recursion, unexpected tracebacks, and is generally more
predictable.

The pattern is borrowed from util.promise, where we're now doing the same.
This commit is contained in:
Matthew Wild 2021-11-29 14:14:30 +00:00
parent cfef2c6ef6
commit d46c43fbeb
2 changed files with 54 additions and 2 deletions
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10
util/async.lua
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@ -13,6 +13,9 @@ end
-- Configurable functions
local schedule_task = nil; -- schedule_task(seconds, callback)
local next_tick = function (f)
f();
end
local function runner_from_thread(thread)
local level = 0;
@ -62,8 +65,10 @@ local function runner_continue(thread)
-- If state is 'ready', it is our responsibility to update runner.state from 'waiting'.
-- We also have to :run(), because the queue might have further items that will not be
-- processed otherwise. FIXME: It's probably best to do this in a nexttick (0 timer).
runner.state = "ready";
runner:run();
next_tick(function ()
runner.state = "ready";
runner:run();
end);
end
return true;
end
@ -286,5 +291,6 @@ return {
wait_for = wait_for;
sleep = sleep;
set_nexttick = function(new_next_tick) next_tick = new_next_tick; end;
set_schedule_function = function (new_schedule_function) schedule_task = new_schedule_function; end;
};