[fpc-pascal] using mtprocs

Mattias Gaertner nc-gaertnma at netcologne.de
Fri Apr 19 08:59:01 CEST 2013


On Fri, 19 Apr 2013 00:39:03 +0100
John Lee <johnelee0 at gmail.com> wrote:

> Thanks - however, my attempt to modify the test program by adding the exec
> as below so it works in 'parallel' with the main program doesn't work, so I
> must have missed something.

What does not work?

 
> program Test;
> {$mode objfpc}{$H+}
> uses windows,classes, dos,  crt, sysutils,MTProcs;
> var j:longint;
> 
> // a simple parallel procedure
> procedure DoSomethingParallel(Index: PtrInt; Data: Pointer; Item:
> TMultiThreadP‚ô¶
> var
>   i: Integer;
> begin
>   writeln(Index);
>   if index=1 then
>   begin

Index runs from 1..5. This is executed only in the first step.

>   //this compression, using arc (but it could be 7z takes 30 secs)
>    exec('c:\windows\system32\cmd','/c c:\utils\arc a -mx tmp
> c:\live_sol\ans.dat');
>    exit;
>   end;
>   for i:=1 to Index*1000000 do ; // do some work
> end;
> 
> begin
>   ProcThreadPool.DoParallel(@DoSomethingParallel,1,5,nil); // address,
> startind‚ô¶
>  //main prog eg capturing the xml
>   for j:=1 to 10 do
>    begin write(j,' '); sleep(10000); end;

Do you see this output?

> end.

Mattias



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