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Multi Threading???

Posted on 1998-11-26
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Last Modified: 2012-05-04
I've created a simple TThread object that downloads a file via FTP protocol.  Everything seems to be working fine except that the main form is very sluggish while threads are running.  Also threads tend to freeze system at end of downlaod.  Any help or pointers to thread documentation would be appreciated.

Here's the code:

unit uFtpThread;

interface

uses
  Classes, agFtp, agFTPCls;

type
  TFtpThread = class(TThread)
  private
    FTargetFileName : String;
    FLocalFileName : String;
    FFtp : TagFtp;
    procedure DownloadFile;
  protected
    procedure Execute; override;
  public
    constructor create(Ftp : TagFtp; sTargetFilename, sLocalFileName : String);
  end;

implementation

constructor TFtpThread.create(Ftp: TagFtp; sTargetFilename,
  sLocalFileName: String);
begin
  inherited Create(False);
  FreeOnTerminate := True;
  FFtp := Ftp;
  FTargetFileName := sTargetFilename;
  FLocalFileName := sLocalFileName;
end;

procedure TFtpThread.DownloadFile;
begin
  FFtp.RetrieveFile(FTargetFileName, FLocalFileName);
end;

procedure TFtpThread.Execute;
begin
  DownloadFile;
end;

end.
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Question by:sparklin
2 Comments
 

Author Comment

by:sparklin
ID: 1348162
Edited text of question
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Accepted Solution

by:
jack_p50 earned 100 total points
ID: 1348163
You should set Thread's priority level to low/lowest so it doesn't freeze system. Also you should check how many such Threads are active and than manage their priorities, so sum
of resources useing by all threads be almost constant(not depends on number of Threads)
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