[fpc-pascal] TProcess stack size

Michael Van Canneyt michael at freepascal.org
Mon Aug 25 11:33:59 CEST 2014

On Fri, 22 Aug 2014, Frank Poretzky wrote:

> Hi,
> in MS Windows is there a way to increase stack size for an executable
> run through TProcess?

Not that I am aware of.

> For portability reasons I tried to migrate from
> CreateProcess to TProcess, but when executing more complex operations of
> the called program it now aborts due to a memory shortage though simpler
> tasks in the same program run correctly. I've already set the project's
> heap (-Ch) and stack size (-Cs) to high values.
>  AProcess.Options := [poUsePipes, poNoConsole];
>  AProcess.PipeBufferSize := 2048;
>  AProcess.ShowWindow := swoNone;
>  AProcess.CurrentDirectory := ExtractFilePath( ExeStr);
>  AProcess.Executable := ExeStr;
>  AProcess.Parameters.Text := ParStr;
>  AProcess.Execute;
> makes problems whereas with
>  CreateProcess( nil,
>                 PChar( ExeStr + ' ' + ParStr),
>                 @SecAttribs, nil,
>                 true,

the CREATE_SEPARATE_WOW_VDM is something that does not exist in TProcess, 
but since it is used to control 16-bit processes, I doubt this is the cause of your problem.

>                 nil,
>                 PChar( ExtractFilePath( ExeStr)),
>                 StartInfo, ProcInfo);
> as well as run directly from the commandline it works properly.

Does the program create output ?

If so, are you reading the output from the pipes ? If not, this is most likely your problem. 
When the I/O buffers are full, The program will block till you read the output and thus free 
the I/O buffers...


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