what is a tight loop?

[Dsk001]

What is a tight loop?

[Ben]

 - A term used to describe a code construct that results in repeated execution of the same code with the same results and not releasing the processor for use by other processes. Tight loops exibit themselves as a CPU bound application. Tight loops can be avoided in LV by using a "zero ms wait" (literally a "0" wired to a ms wait timer) in the loop thereby allowing other tasks to be processed. Search this site for the term "cooperative multitasking".

Ben 

[smercurio_fc]

Also known as a Greedy Loop

Of course, sometimes you actually want something like this, but that's more the exception rather than the rule.

[Dsk001]

Can you please explain, what happens when you place a "zero ms wait" in a tight loop.

Isn't wiring a zero equilant to not placing the wait function?

Thanks

Dsk001

[smercurio_fc]

No, it's not the same. Wiring a zero allows the operating system to give time to other processes running and return to your program as soon as possible. Wiring a 1 means your program is telling the operating system "go ahead and do other stuff, but when you come back, make sure it's been at least 1 msec before you get back to me. "

[Dsk001]

That is helpful.

Thanks

Dsk001