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Re: Parallel Processing [message #80714 is a reply to message #80624]

Thu, 05 July 2012 08:13

Lajos Foldy
Messages: 176
Registered: December 2011

Senior Member

On Thursday, July 5, 2012 4:52:23 PM UTC+2, Stefan wrote:
> Hi
>
> Now that I have successfully implemented multi-threading another problem occured:
>
> To invoke multiple processes I start in a loop with
>
> bridges[i]->EXECUTE, 'program,par1,par2', /NOWAIT
>
> where 'bridges' is an object-array which holds the different child processes.
> Upon the execution of the last process I do
>
> bridges[i]->EXECUTE, 'program,par3,par4'
>
> And after that I destroy my bridges in a loop.
>
> Now I have a problem if the last process finishes before one of the previous processes since upon its completion it will directly move to the part where all bridges are destroyed and kills my program...
>
> Is there an easy way to tell IDL to wait for all my processes to finish and then destroy the bridges?
>
> thanks
> Stefan

Use IDL_IDLBridge::Status to determine whether the job is finished. Pseudocode:

ndone=0
running=replicate(1, njobs)
while ndone lt njobs begin
for j=0,njobs-1 do begin
if running[j] then begin
query status of the j-th job with IDL_IDLBridge::Status
if finished
destroy bridge
running[j]=0
ndone++
endif
endif
endfor
wait, 1
endwhile

regards,
Lajos

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[Message index]

		Parallel Processing By: stefan.meingast on Thu, 28 June 2012 07:05
		Re: Parallel Processing By: lecacheux.alain on Thu, 05 July 2012 08:53
		Re: Parallel Processing By: Russell Ryan on Thu, 05 July 2012 08:29
		Re: Parallel Processing By: stefan.meingast on Thu, 05 July 2012 08:16
		Re: Parallel Processing By: Lajos Foldy on Thu, 05 July 2012 08:13
		Re: Parallel Processing By: stefan.meingast on Thu, 05 July 2012 07:52
		Re: Parallel Processing By: stefan.meingast on Thu, 05 July 2012 07:50

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