Multiple Cogs, Single PUB

oliver_man_77

Is it possible to have multiple cogs run the same PUB or do I need to creat a seprate PUB for each cog? I am wanting to run a proscess with two inputs and 5 outputs. it is possible in my situation to have the proscess start on a product before it completeles the proscess on a previous product. I was thinking of having a new cog control the proscess for each new product that enters.

Rayman

The answer is "yes", if I understand the question correctly... In SPIN, you can use COGNEW several times on the same PUB proceedure. But, you must give each COG it's own STACK space...

oliver_man_77

Correct, I am write a single PUB and have it run simultaneously in multiple cogs. I just have to figure out how long my stacks need to be. I'm just trying to cheat and not have to write a bunch of code.

Phil Pilgrim (PhiPi)

This brings up another point, which hasn't been addressed yet. If the PUB procedure uses VAR and/or DAT variables, each instance that's COGNEWed will share a single copy. This is because there's no way for the compiler to know, at compile time, how many new cogs are being spawned. If this is a problem, you will need to include the PUB procedure in a separate object and declare that object in your top-level program as an array big enough to accommodate all instances. In this case, only the DAT variables will be shared, and the compiler will allocate a separate set of VAR variables for each instance.

-Phil

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oliver_man_77

I would say you have pretty much got this going for me. I have it running pretty much the way I want now just clean up the code and test it for any glitches. I'm thinking a really good scope should work. My encoder signal will be coming in around the neighborhood of 500KHz. I can't really afford to miss to many pulses and I'm hoping that switching between cogs doesn't effect anything. Thanks alot for helping to get me rolling.