Two cog questions

acantostega

Hi,
I have a couple of doubts regarding how cogs execute code. Say I have something like this:

PUB Start
   cognew(function2,@stack1)
   function1 ' a call to function1

PUB function1
   'some code

PUB function2
   'some code
   function1 ' a call to function1

Let's suppose this code started on cog 1 and function2 was launched on cog 2.
When I called function1 from within function2 (which is running in cog 2) does it run on cog 1 or cog 2?
When I called function1 from within Start, what happens if it is still running from when I called it in function2? Are two versions running in "parallel" (with which I guess I mean each cog sets up function1's local variables in their own stack and they don't interfere with each other)?

An example case would be having one "Timing" object, which provides functions such as pause1ms(ms). Can any function, regardless of what cog it is running in, call pause1ms without it interfering with any other cog using the same function?

Thanks in advance!

Martin Hebel

When a function is used, it is only stored once in shared RAM. Each cog calling that function will be accessing the exact same tokens. But, each has it's own stack space, so for data manipulation and math, the independent stacks will be used.

The Cog that call the function will be processing that function. It doesn't really run "on the cog", the cogs simply interpret the same code.

-Martin

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Martin Hebel
Personal Links with plenty of BASIC Stamp info
StampPlot - Graphical Data Acquisition and Control
AppBee - XBee ZigBee / IEEE 802.15.4 Adapters & Devices

acantostega

Ok. Thanks!