how to run a proc at background ? 2

[dotaliu]

for example:
proc a {} {
...
}
proc b {} {
puts "step 1"
a
puts "step 2"
}
Is there a way to run proc a at background ?

 

[Bong]

I don't think you're question is well formed. If Tcl is running in the foreground, well, then it is. I think what you want is for proc a to run in a separate thread. I've never used threads, myself, but I'm told they can be terribly effective. See:

http://wiki.tcl.tk/2770

_________________
Bob Rashkin

 

[dotaliu]

thanks for Bong reply. Being a newhand, some question is not professional. I don't want to use complicate multi-thread , so your answer is enough.

 

[prex1]

A way to do that is as follows:

proc a {} {
  global myafter msec
  ...
  set myafter [after $msec a]
}

Proc [tt]a[/tt] need be called once (and only once) by your code where you need to start it, and [tt]$msec[/tt] should not be zero, otherwise the rest of the code won't execute. [tt]myafter[/tt] is a handle that allows you to stop the loop somewhere else in the code with [tt]after cancel $myafter[/tt] . And of course if proc [tt]a[/tt] is resource consuming, it will slow down the rest of the code performed actions...

Franco

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