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[added] stall support, timers and intervals to async
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parent
3d3ccd921c
commit
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55
async.lua
55
async.lua
@ -1,6 +1,11 @@
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--[[
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--[[
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simple kernel for async tasks running in the background
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simple kernel for async tasks running in the background
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can "stall" a task by yielding the string "stall"
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this will suspend the coroutine until the rest of
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the queue has been processed or stalled
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and can early-out update_for_time
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todo:
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todo:
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multiple types of callbacks
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multiple types of callbacks
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finish, error, step
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finish, error, step
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@ -15,6 +20,7 @@ async._mt = {__index = async}
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function async:new()
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function async:new()
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return setmetatable({
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return setmetatable({
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tasks = {},
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tasks = {},
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tasks_stalled = {},
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}, self._mt)
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}, self._mt)
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end
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end
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@ -33,8 +39,15 @@ function async:update()
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--grab task definition
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--grab task definition
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local td = table.remove(self.tasks, 1)
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local td = table.remove(self.tasks, 1)
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if not td then
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if not td then
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--have we got stalled tasks to re-try?
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if #self.tasks_stalled > 0 then
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--swap queues rather than churning elements
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self.tasks_stalled, self.tasks = self.tasks, self.tasks_stalled
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td = table.remove(self.tasks, 1)
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else
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return false
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return false
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end
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end
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end
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--run a step
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--run a step
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local co, args, cb, error_cb = td[1], td[2], td[3], td[4]
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local co, args, cb, error_cb = td[1], td[2], td[3], td[4]
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--(reuse these 8 temps)
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--(reuse these 8 temps)
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@ -54,23 +67,61 @@ function async:update()
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--check done
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--check done
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if coroutine.status(co) == "dead" then
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if coroutine.status(co) == "dead" then
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--done? run callback with result
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--done? run callback with result
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if cb then
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cb(a, b, c, d, e, f, g, h)
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cb(a, b, c, d, e, f, g, h)
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end
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else
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--if not completed, re-add to the appropriate queue
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if a == "stall" then
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--add to stalled queue as signalled stall
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table.insert(self.tasks_stalled, td)
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else
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else
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--if not done, re-add
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table.insert(self.tasks, td)
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table.insert(self.tasks, td)
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end
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end
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end
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return true
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return true
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end
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end
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--update tasks for some amount of time
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--update tasks for some amount of time
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function async:update_for_time(t)
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function async:update_for_time(t, early_out_stalls)
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local now = love.timer.getTime()
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local now = love.timer.getTime()
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while love.timer.getTime() - now < t do
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while love.timer.getTime() - now < t do
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if not self:update() then
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if not self:update() then
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break
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break
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end
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end
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--all stalled?
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if early_out_stalls and #self.tasks == 0 then
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break
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end
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end
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end
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end
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end
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--add a function to run after a certain delay (in seconds)
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function async:add_timeout(f, delay)
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local trigger_time = love.timer.getTime() + delay
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self:call(function()
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while love.timer.getTime() < trigger_time do
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coroutine.yield("stall")
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end
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f()
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end)
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end
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--add a function to run repeatedly every delay (in seconds)
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--note: not super useful currently unless you plan to destroy the async object
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-- as there's no way to remove tasks :)
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function async:add_interval(f, delay)
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local trigger_time = love.timer.getTime() + delay
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self:call(function()
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while true do
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while love.timer.getTime() < trigger_time do
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coroutine.yield("stall")
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end
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f()
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trigger_time = trigger_time + delay
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end
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end)
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end
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return async
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return async
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