Indy/Lib/Core/IdSchedulerOfThreadDefault.pas

{
  $Project$
  $Workfile$
  $Revision$
  $DateUTC$
  $Id$

  This file is part of the Indy (Internet Direct) project, and is offered
  under the dual-licensing agreement described on the Indy website.
  (http://www.indyproject.org/)

  Copyright:
   (c) 1993-2005, Chad Z. Hower and the Indy Pit Crew. All rights reserved.
}
{
  $Log$
}
{
  Rev 1.12    2004.02.03 4:17:06 PM  czhower
  For unit name changes.

  Rev 1.11    2003.10.24 12:59:20 PM  czhower
  Name change

  Rev 1.10    2003.10.21 12:19:00 AM  czhower
  TIdTask support and fiber bug fixes.

  Rev 1.9    2003.10.11 5:49:40 PM  czhower
  -VCL fixes for servers
  -Chain suport for servers (Super core)
  -Scheduler upgrades
  -Full yarn support

  Rev 1.8    2003.09.19 10:11:18 PM  czhower
  Next stage of fiber support in servers.

  Rev 1.7    2003.09.19 11:54:30 AM  czhower
  -Completed more features necessary for servers
  -Fixed some bugs

  Rev 1.6    2003.09.18 4:10:26 PM  czhower
  Preliminary changes for Yarn support.

  Rev 1.5    7/6/2003 8:04:06 PM  BGooijen
  Renamed IdScheduler* to IdSchedulerOf*

  Rev 1.4    7/5/2003 11:49:06 PM  BGooijen
  Cleaned up and fixed av in threadpool

  Rev 1.3    2003.06.25 4:26:40 PM  czhower
  Removed unecessary code in RemoveThread

  Rev 1.2    3/13/2003 10:18:32 AM  BGooijen
  Server side fibers, bug fixes

  Rev 1.1    1/23/2003 11:06:02 AM  BGooijen

  Rev 1.0    1/17/2003 03:29:54 PM  JPMugaas
  Renamed from ThreadMgr for new design.

  Rev 1.0    11/13/2002 09:01:40 AM  JPMugaas
}

unit IdSchedulerOfThreadDefault;

interface
{$i IdCompilerDefines.inc}

uses
  IdThread, IdSchedulerOfThread, IdScheduler, IdYarn;

type
  TIdSchedulerOfThreadDefault = class(TIdSchedulerOfThread)
  public
    function AcquireYarn: TIdYarn; override;
    procedure ReleaseYarn(AYarn: TIdYarn); override;
    function NewThread: TIdThreadWithTask; override;
  end;

implementation

uses
  IdGlobal;

{ TIdSchedulerOfThreadDefault }

function TIdSchedulerOfThreadDefault.AcquireYarn: TIdYarn;
begin
  Result := NewYarn(NewThread);
  ActiveYarns.Add(Result);
end;

type
  TIdYarnOfThreadAccess = class(TIdYarnOfThread)
  end;

procedure TIdSchedulerOfThreadDefault.ReleaseYarn(AYarn: TIdYarn);
//only gets called from YarnOf(Fiber/Thread).Destroy
var
  LThread: TIdThreadWithTask;
begin
  //take posession of the thread
  LThread := TIdYarnOfThread(AYarn).Thread;
  {$I IdObjectChecksOff.inc}
  TIdYarnOfThreadAccess(AYarn).FThread := nil;
  {$I IdObjectChecksOn.inc}
  //Currently LThread can =nil. Is that a valid condition?
  //Assert(LThread<>nil);

  // inherited removes from ActiveYarns list
  inherited ReleaseYarn(AYarn);

  if LThread <> nil then begin
    // need to destroy the thread
    LThread.Yarn := nil; // Yarn is being destroyed, de-couple it from the thread
    LThread.Terminate;
    // RLebeau - ReleaseYarn() can be called in the context of
    // the yarn's thread (when TIdThread.Cleanup() destroys the
    // yarn between connnections), so have to check which context
    // we're in here so as not to deadlock the thread!
    if IsCurrentThread(LThread) then begin
      LThread.FreeOnTerminate := True;
    end else begin
      {$IFDEF DEPRECATED_TThread_SuspendResume}
      LThread.Suspended := False;
      {$ELSE}
      LThread.Resume;
      {$ENDIF}
      LThread.WaitFor;
      LThread.Free;
    end;
  end;
end;

function TIdSchedulerOfThreadDefault.NewThread: TIdThreadWithTask;
begin
  Result := inherited NewThread;
  // RLebeau 2/25/2010: do not let the thread free itself on termination yet.
  // It can cause crashes during Yarn shutdown, so let the Scheduler decide
  // what to do with the thread later...
  //Result.FreeOnTerminate := True;
end;

end.