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{ Source provided for Free Pascal Bug Report 4201 }
{ Submitted by "Gergely Nagy" on 2005-07-19 }
{ e-mail: gergely.nagy@softreal.hu }
{ TThread.Synchronize on an abstract virtual method bug demonstration
by Gergely Nagy <gergely.nagy@softreal.hu> }
{$mode delphi}
program fp_thread_bug_test;
uses
{$ifdef unix}
CThreads,
{$endif unix}
Classes;
type
TBuggedBaseThread = class;
TBuggedBaseThread = class (TThread)
protected
procedure Execute; override;
function ExecuteOperation: Boolean; virtual; abstract;
procedure EndOperation; virtual; abstract;
public
constructor Create;
procedure StopThread;
end;
TBuggedThread = class (TBuggedBaseThread)
protected
function ExecuteOperation: Boolean; override;
procedure EndOperation; override;
end;
constructor TBuggedBaseThread.Create;
begin
inherited Create(True);
end;
procedure TBuggedBaseThread.StopThread;
begin
Terminate;
Suspended:= False;
WaitFor;
Free;
end;
procedure TBuggedBaseThread.Execute;
begin
WriteLn ('# Execute...');
ExecuteOperation;
WriteLn ('# ...Going to sync...');
Synchronize(EndOperation);
Terminate;
end;
procedure TBuggedThread.EndOperation;
begin
WriteLn ('# EndOperation');
end;
function TBuggedThread.ExecuteOperation: Boolean;
begin
WriteLn ('# ExecuteOperation');
Result:= True;
end;
var
t: TBuggedThread;
begin
t:= TBuggedThread.Create;
t.Execute;
t.Free();
end.
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