Tasking (Background tasks)?
Brian Yennie
briany at qldlearning.com
Wed Jun 9 16:38:26 EDT 2004
Wait with messages is one option that will allow other messages to be
sent and executed. Another is to use "send" to process things in
chunks, such as:
on mouseUp
loadSomeData
end mouseUp
on loadSomeData
if (dataLoadingComplete() = TRUE) then
...
send "loadSomeData" to me in 50 milliseconds
end if
end loadSomeData
By using send, you are essentially "yielding" until the next message is
delivered, and you can specify how much time you want to give up- the
above example giving 50 milliseconds between chunks of processing. I've
never compared "send" to "wait with messages" directly, but I presume
"wait" will give you the tightest loop while "send" offers the most
flexibility.
HTH
> I realize that it is the accepted method of taking in the RR
> environment but I am wondering if there are not any simple cooperative
> multi-tasking constructs. I am loading a significant amount of data
> using a repeat loop I would like at the approiate time to yeild to any
> other tasks. Can I accomplish this by using wait for messages? Has
> someone already built cooperative tasking API or LIB? Is it even
> possible. Since using a WAG to dealy a function is contrary to many
> multi-tasking concepts.
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