Subject:
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Re: events or infinite loops... which is better?
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 12 Oct 2002 04:50:51 GMT
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Viewed:
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1020 times
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In article <H3u6HL.694@lugnet.com>,
"Rob Stehlik" <Robbby31@hotmail.com> wrote:
> So, are these two methods essentially equivalent? I realize you can 'do
> something else' with the first method by having your infinite loop in one
> task, and work on something else in another task. But, you are really just
> jumping between tasks quickly. If events are actually interrupts, then I
> think it would be more efficient this way, since the cpu can spend its time
> doing other things, and only pauses when the interrupt line is triggered.
> Can anyone more knowledgable offer some feedback on this?
> Rob
Events are generally going to be more efficient since no bytecodes need
to be executed to continually check for a condition. However,
efficiency is not always the most important factor. I don't think
either one is necessarily "better". A lot depends on what you are
trying to do. Let's say you want to repeatedly do activity A while
waiting for condition B and then execute C in response.
Using conditions...
while(!B)
{
A();
}
C();
A() will always run to completion. This can be convenient if A() has
several steps to it and you want all step to be completed.
Using events...
monitor(B)
{
while(true) {
A();
}
}
C();
A() can be interrupted half way through. This can be convenient if A()
is going to take a while and you want to respond to B very quickly.
I use both mechanisms in my own programming.
Dave
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Message is in Reply To:
 | | events or infinite loops... which is better?
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| Hi Everyone, I just recently learned how to use event monitoring, and I really like it. My question is whether or not this method is more efficient than infinite loops. I always used to check for sensor readings using an infinite loop something like (...) (22 years ago, 11-Oct-02, to lugnet.robotics)
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