Fastream Technologies wrote:
> Q: Do one need to protect Terminated variable of TThread and
> Terminate() as well?
No, read/write of property Terminated should be atomic, so you
won't get an error but a critical section may be usefull.
if not Thread.Terminated then
Thread.Terminate;
If you do this from multiple threads it may happen this:
if not Thread.Terminated then
// thread switch occures and another
// thread calls Terminate so
// Terminated is now TRUE!!
Thread.Terminate;
---
Arno Garrels [TeamICS]
http://www.overbyte.be/eng/overbyte/teamics.html
>
> Best Regards,
>
> Gorkem Ates
>
> ----- Original Message -----
> From: "Arno Garrels" <[EMAIL PROTECTED]>
> To: "ICS support mailing" <[email protected]>
> Sent: Thursday, February 01, 2007 4:31 PM
> Subject: Re: [twsocket] THttpMTServer problem with Dup
>
>
>> Fastream Technologies wrote:
>>
>>>> I don't know this exception message, do you mean "List index out of
>>>> bounds()"?
>>>
>>> Yes, exactly.
>>
>> So most likely you hit a synchronization bug in your code, hard to
>> say what's wrong. Critical stuff is access to the client list,
>> add/remove clients and iterate. Those things need to be
>> protected very carefully. Only one thread may access the list
>> at the same time. Also reading property ClientCount is unreliable
>> since right after a read its value may already have changed.
>> Especially take care what happens when a client disconnects as
>> well as handle all possible exceptions inside the threads,
>> including component exceptions. It may help if you use a TThreadList
>> instead of current TList, at least it's easier to code thread-safe.
>>
>> ---
>> Arno Garrels [TeamICS]
>> http://www.overbyte.be/eng/overbyte/teamics.html
>>
>>
>>>
>>>>
>>>> According to procedure Dup, the component state does not seem to be
>>>> wsClosed.
>>>>
>>>> procedure TCustomWSocket.Dup(NewHSocket : TSocket);
>>>> var
>>>> iStatus : Integer;
>>>> optlen : Integer;
>>>> begin
>>>> ..
>>>> if FState <> wsClosed then begin
>>>> iStatus := WSocket_Synchronized_closesocket(FHSocket);
>>>> FHSocket := INVALID_SOCKET;
>>>> if iStatus <> 0 then begin
>>>> SocketError('Dup (closesocket)');
>>>> Exit;
>>>> end;
>>>>
>>>> ChangeState(wsClosed);
>>>> end;
>>>> FHsocket := NewHSocket;
>>>> ..
>>>>
>>>> ---
>>>> Arno Garrels [TeamICS]
>>>> http://www.overbyte.be/eng/overbyte/teamics.html
>>>>
>>>>
>>>>
>>>> Fastream Technologies wrote:
>>>>> Hello,
>>>>>
>>>>> I have the following function called from worker thread context
>>>>> (NewHSocket passed with a message):
>>>>>
>>>>> function TCustomWSocketMTServer.AfterClientCreated(
>>>>> Client : TWSocketMTClient; Error: Word; NewHSocket: integer) :
>>>>> boolean; var
>>>>> currentClientCount: integer;
>>>>> currentMaxClients: integer;
>>>>> begin
>>>>> Result := TRUE;
>>>>>
>>>>> FCriticalSection.Enter;
>>>>> Inc(FClientNum);
>>>>> Client.Name := Name + 'Client' +
>>>>> IntToStr(FClientNum); FClientList.Add(Client);
>>>>> currentClientCount := FClientList.Count;
>>>>> Client.Banner := FBanner;
>>>>> Client.Server := Self;
>>>>> currentMaxClients := FMaxClients;
>>>>> FCriticalSection.Leave;
>>>>>
>>>>> {$IFNDEF NO_DEBUG_LOG}
>>>>> Client.IcsLogger := IcsLogger;
>>>>> { V5.04 } {$ENDIF}
>>>>>
>>>>> Client.Dup(NewHSocket); // SOMETIMES WHEN HIGH LOAD IS IN
>>>>> PLACE, THIS FUNCTION MAKES CLIENT.HSOCKET = -1 AND RAISES THE
>>>>> EXCEPTION "LIST ITEM OUT OF INDEX"
>>>>> Client.OnDataSent := nil;
>>>>>
>>>>> TriggerClientConnect(Client, Error);
>>>>>
>>>>> { Ok, the client is still there, process with the connection }
>>>>> if (currentMaxClients > 0) and (currentClientCount >
>>>>> currentMaxClients) then begin
>>>>> { Sorry, too much clients }
>>>>> Client.Banner := BannerTooBusy;
>>>>> Client.OnDataAvailable := nil; // should be set previously
>>>>> in initClient for non-503
>>>>> Client.StartConnection;
>>>>> Client.CloseDelayed;
>>>>>
>>>>> Result := false;
>>>>> end;
>>>>> end;
>>>>>
>>>>> Any idea?
>>>>>
>>>>> Best Regards,
>>>>>
>>>>> SZ
>>>> --
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