coroutine & busy wait?
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- Subject: coroutine & busy wait?
- From: PA <petite.abeille@...>
- Date: Fri, 4 Feb 2005 01:01:24 +0100
Hello,
I'm playing with coroutines and I wrote a little timer of sort:
http://dev.alt.textdrive.com/file/lu/LUTimer.lua
This works alright as far as the timer itself goes, but unfortunately
the dispatcher loop consume an inordinate amount of CPU looping thought
all the tasks... :/
Here is how it looks like:
LUTimer.new( ATask.new(), 1, true )
LUTimer.new( ATask.new(), 2, true )
02/04 00:46:20 (Debug) ATask.run: "@1176928: 1"
02/04 00:46:22 (Debug) ATask.run: "@1188224: 1"
"ATask" simply print out itself to standout.
The timer checks the os.clock and invokes its target run method from
time to time:
this.run = function()
repeat
if os.clock() - clock() >= this.interval() then
this.target().run()
resetClock()
end
this.task().yield()
until this.shouldRepeat() == false
end
So far, so good.
The problem is with the dispatcher loop:
thisClass.loop = function()
while thisClass.tasks().size() > 0 do
thisClass.run()
end
end
Which repetitively runs through all the registered tasks ad nauseam:
-- class method to 'run' through all the tasks
thisClass.run = function()
local someTasks = thisClass.tasks()
local count = someTasks.size()
-- someTasks.shuffle()
if count > 0 then
for index = 1, count do
local aTask = someTasks.get( index )
if aTask ~= nil then
local aStatus = aTask.status()
-- print( "aStatus: "..aStatus )
if aStatus == "dead" then
aTask.target().setTask( nil )
someTasks.remove( index )
elseif aStatus == "suspended" then
aTask.resume()
end
end
end
end
return this
end
I'm not quite sure how to deal with the "busy wait" introduced by the
dispatcher run loop though. Ideally the dispatching should be based on
some kind of events. But at first glance I don't quite see how to pull
this out using only Lua itself... ideas much appreciated :)
TIA.
Cheers
--
PA, Onnay Equitursay
http://alt.textdrive.com/