基于这里几个问题,所以我已经实现了一个线程,可以在完成它的工作之前被用户杀死,或者如果我设置它在一段时间后自行终止。德尔福 - 线程停止由用户或自我终止后一段时间
线程执行:
unit Unit2;
interface
uses SyncObjs
,classes
,System.SysUtils
,windows;
type
TMyThread = class(TThread)
private
FTerminateEvent: TEvent;
FTimerStart: Cardinal;
FTimerLimit: Cardinal;
FTimeout: Boolean;
protected
procedure Execute; override;
procedure TerminatedSet; override;
public
constructor Create(ACreateSuspended: Boolean; Timeout: Cardinal); overload;
destructor Destroy; override;
end;
implementation
constructor TMyThread.Create(ACreateSuspended: Boolean; TimeOut: Cardinal);
begin
inherited Create(ACreateSuspended);
FTerminateEvent := TEvent.Create(nil, True, False, '');
FTimerStart:=GetTickCount;
FTimerLimit:=Timeout;
FTimeout:=True;
end;
destructor TMyThread.Destroy;
begin
OutputDebugString(PChar('destroy '+inttostr(Handle)));
inherited;
FTerminateEvent.Free;
end;
procedure TMyThread.TerminatedSet;
begin
FTerminateEvent.SetEvent;
end;
procedure TMyThread.Execute;
var
FTimerNow:Cardinal;
begin
FTimerNow:=GetTickCount;
while not(Terminated) and ((FTimerNow-FTimerStart)<FTimerLimit) do
begin
OutputDebugString(PChar('execute '+inttostr(Handle)));
FTerminateEvent.WaitFor(100);
FTimerNow:=GetTickCount;
end;
if (FTimerNow-FTimerStart) > FTimerLimit then
begin
self.Free;
end;
end;
end.
和线程是如何在应用程序的主单元创建
unit Unit1;
interface
uses
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs
,unit2, Vcl.StdCtrls
;
type
TForm1 = class(TForm)
Button1: TButton;
Button2: TButton;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
private
t1,t2: TMyThread;
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.Button1Click(Sender: TObject);
begin
//
if t1 = nil then
t1 := TMyThread.Create(false,10000)
else
if t2 = nil then
t2 := TMyThread.Create(False,10000);
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
//
if t1 <> nil then
begin
t1.Free;
t1 := nil;
end
else
if t2 <> nil then
begin
t2.Free;
t2 := nil;
end;
end;
end.
我想的是,要么停止时,我杀它一个工作线程,一段时间后。当线程需要自行终止时会出现问题,因为出现内存泄漏并且我的事件没有被释放。 LE:将FreeOnTerminate
设置为True
会导致多次访问冲突。
在FreeOnTerminate线程实例上调用Terminate是个坏主意。它可以通过超时释放。还不需要管理零设置。只需从局部变量或没有任何变量创建线程。 –
使用标志来告诉线程何时在“OnTerminate”事件中完成其作业。 –
@LURD事件['TThread.OnTerminate'](http://docwiki.embarcadero.com/Libraries/en/System.Classes.TThread.OnTerminate)是MainThread上下文中的同步调用。如果你输入方法'TForm1。Button2Click',你将在't1' /'t2'或'nil'引用中有一个有效的引用。所以这种方法是安全的 –