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Migrating from Indy 9 to 10 with Delphi, TIdSchedulerOfThreadPool problem

Posted on 2013-01-23
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Last Modified: 2013-12-03
I'm in the process of updating a Delphi app from Indy 9 to Indy 10.

It's quite painful, as apparently a lot has changed.

I'm stuck at one step.

Here is the old code (working with Indy 9):

A Thread Pool is created and every thread of the pool is initialized and then started.
The individual threads create an indy http client (but it does not matter here).
  TUrlThread = class(TIdThread)

...  

var
  i: Integer;
begin
  // create the Pool and init it
  Pool            := TIdThreadMgrPool.Create(nil);
  Pool.PoolSize   := Options.RunningThreads;
  Pool.ThreadClass:= TUrlThread;

  // init threads and start them
  for i := 1 to Options.RunningThreads do
  begin
    with (Pool.GetThread as TUrlThread) do
    begin
      Index     := i;
      Controler := Self;
      Priority  := Options.Priority;
      Start;
    end;
  end;

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The TIdThreadMgrPool class is gone with Indy 10.

I've looked for a replacement and TIdSchedulerOfThreadPool looks like a winner,
but I cannot get it running.

Here is the modified (Indy 10) code:
  TUrlThread = class(TIdThreadWithTask)

...

 var
  i: Integer;
begin
  // create the Pool and init it
  Pool            := TIdSchedulerOfThreadPool.Create(nil);
  Pool.PoolSize   := Options.RunningThreads;
  Pool.ThreadClass:= TUrlThread;

  // init threads and start them
  for i := 1 to Options.RunningThreads do
  begin
    with (Pool.NewThread as TUrlThread) do
    begin
      Index     := i;
      Controler := Self;
      Priority  := Options.Priority;
      Start;
    end;
  end;

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I get an access violation exception here (this is indy code):
procedure TIdTask.DoBeforeRun;
begin
  FBeforeRunDone := True;
  BeforeRun;
end;

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FBeforeRunDone is nil.
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Question by:Casady
  • 4
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7 Comments
 
LVL 25

Expert Comment

by:Sinisa Vuk
ID: 38823170
Try to install  latest version of Indy.
http://www.projectindy.org/Sockets/Download/DevSnapshot.EN.aspx
In source folder is Playgrounds folder with TIdSchedulerOfThreadPool example.
0
 

Author Comment

by:Casady
ID: 38823196
I've installed indy 10.1.5 about 1 week ago. This version has no playground folder.

If there is a newer version, would you please give me the direct URL of the installer.

The projectindy website often directs to 404 errors.
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LVL 25

Expert Comment

by:Sinisa Vuk
ID: 38824572
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Author Comment

by:Casady
ID: 38835128
I did a SVN checkout of the daily Indy 10 and Indy 10 demos.

Unfortunately the problem remains, and the demos  don't have an example that uses TIdSchedulerOfThreadPool (die a grep in all .pas files for it).
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Accepted Solution

by:
Casady earned 0 total points
ID: 38846484
I've received the solution in another forum.

In case someone else has this problem please see here:

http://stackoverflow.com/questions/14514810/migrating-from-indy-9-to-10-with-delphi-tidschedulerofthreadpool-initialization/14519101#14519101
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Author Closing Comment

by:Casady
ID: 39073084
got answer on another forum and posted a link
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