BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  TIDTCPServer doesn't accept any connections at some point Goto page 1, 2  Next          BorlandTalk.com Forum Index -> Delphi Internet Winsock View previous topic :: View next topic   Author Message Laura Hilby Guest Posted: Mon Feb 23, 2004 7:22 pm    Post subject: TIDTCPServer doesn't accept any connections at some point Hi! I'm using D5 and Indy 9. I have a server app using TIDTCPServer, maxConnections set to 0 and LinstenQueue set to default (15). The client app connects and sends a request, once it receives the answer back it disconnects.The server is accepting connections for days and all works fine until some point when stops accepting any connections and the client app gets 100061 connection refused error. The server application is not frozen, all seem to be fine just the server is not accepting connections. If I shut down and restart the app the server is working normally again. Any idea what is going on with my server? What should I do? Thanks, Laura Hilby EIMS Inc. Back to top Laura Hilby Guest Posted: Mon Feb 23, 2004 9:13 pm    Post subject: Re: TIDTCPServer doesn't accept any connections at some poin I added some writing to a log in OnListenException and I'm waiting to see if I get any exceptions. My app uses ExceptionMagic that is supposed to capture exceptions and nothing was captured. I'll have to wait and see. Laura "Remy Lebeau (TeamB)" <gambit47.no.spam (AT) no (DOT) spam.yahoo.com> wrote Quote: "Laura Hilby" <lhilby (AT) eims-inc (DOT) com> wrote in message news:403a5198$1 (AT) newsgroups (DOT) borland.com... The server is accepting connections for days and all works fine until some point when stops accepting any connections and the client app gets 100061 connection refused error. The server application is not frozen, all seem to be fine just the server is not accepting connections. TIdTCPServer uses a separate thread for accepting new connections. The only way what you describe can happen is if the listening thread has been aborted such that accept() is no longer being called. Have you checked to see whether the OnListenException event is being triggered at all? Gambit Back to top Remy Lebeau (TeamB) Guest Posted: Mon Feb 23, 2004 9:50 pm    Post subject: Re: TIDTCPServer doesn't accept any connections at some poin "Laura Hilby" <lhilby (AT) eims-inc (DOT) com> wrote Quote: I added some writing to a log in OnListenException and I'm waiting to see if I get any exceptions. My app uses ExceptionMagic that is supposed to capture exceptions and nothing was captured. Then the only other possibilities are that either 1) the listening thread aborted silently without an exception actually being thrown, or 2) the listening thread is somehow deadlocked. Gambit Back to top Laura Hilby Guest Posted: Mon Feb 23, 2004 9:57 pm    Post subject: Re: TIDTCPServer doesn't accept any connections at some poin 1.If it is aborting silently, what can I do about it? 2.If is deadlocked can I take it out of this status? How? Laura "Remy Lebeau (TeamB)" <gambit47.no.spam (AT) no (DOT) spam.yahoo.com> wrote Quote: "Laura Hilby" <lhilby (AT) eims-inc (DOT) com> wrote in message news:403a6b92 (AT) newsgroups (DOT) borland.com... I added some writing to a log in OnListenException and I'm waiting to see if I get any exceptions. My app uses ExceptionMagic that is supposed to capture exceptions and nothing was captured. Then the only other possibilities are that either 1) the listening thread aborted silently without an exception actually being thrown, or 2) the listening thread is somehow deadlocked. Gambit Back to top Chad Z. Hower aka Kudzu Guest Posted: Mon Feb 23, 2004 10:04 pm    Post subject: Re: TIDTCPServer doesn't accept any connections at some poin "Laura Hilby" <lhilby (AT) eims-inc (DOT) com> wrote in news:403a75fe (AT) newsgroups (DOT) borland.com: Quote: 1.If it is aborting silently, what can I do about it? Find your error and fix it. Quote: 2.If is deadlocked can I take it out of this status? How? Dont deadlock it in the first place. -- Chad Z. Hower (a.k.a. Kudzu) - http://www.hower.org/Kudzu/ "Programming is an art form that fights back" Want more Indy stuff? Try the Atozed Indy Portal at http://www.atozedsoftware.com/ * More Free Demos * Free Articles * Extra Support Back to top Remy Lebeau (TeamB) Guest Posted: Mon Feb 23, 2004 11:40 pm    Post subject: Re: TIDTCPServer doesn't accept any connections at some poin "Laura Hilby" <lhilby (AT) eims-inc (DOT) com> wrote Quote: 1.If it is aborting silently, what can I do about it? Nothing. You would have to restart the server. The listening thread(s) are only started when the server's Active property is set to true when the server is previously inactive. Quote: 2.If is deadlocked can I take it out of this status? No, a deadlock is a permanent condition. Off-hand, though, I don't know of any conditions that would deadlock the listening thread. Gambit Back to top Laura Hilby Guest Posted: Tue Feb 24, 2004 12:10 am    Post subject: Re: TIDTCPServer doesn't accept any connections at some poin I was asking for help not a slap on the face.There are quite a bit of people complaining about your answers in the newsgroup. My server app was build on your server demo so if my listener thread becomes deadlock that means your demo will produce the same thing. "Chad Z. Hower aka Kudzu" <cpub (AT) hower (DOT) org> wrote Quote: "Laura Hilby" <lhilby (AT) eims-inc (DOT) com> wrote in news:403a75fe (AT) newsgroups (DOT) borland.com: 1.If it is aborting silently, what can I do about it? Find your error and fix it. 2.If is deadlocked can I take it out of this status? How? Dont deadlock it in the first place. -- Chad Z. Hower (a.k.a. Kudzu) - http://www.hower.org/Kudzu/ "Programming is an art form that fights back" Want more Indy stuff? Try the Atozed Indy Portal at http://www.atozedsoftware.com/ * More Free Demos * Free Articles * Extra Support Back to top Remy Lebeau (TeamB) Guest Posted: Tue Feb 24, 2004 12:37 am    Post subject: Re: TIDTCPServer doesn't accept any connections at some poin "Laura Hilby" <lhilby (AT) eims-inc (DOT) com> wrote Quote: My server app was build on your server demo so if my listener thread becomes deadlock that means your demo will produce the same thing. A deadlock is only one possibility. More likely, the listener thread simply detected a WinSock error and terminated itself silently. Gambit Back to top Chad Z. Hower aka Kudzu Guest Posted: Tue Feb 24, 2004 7:29 am    Post subject: Re: TIDTCPServer doesn't accept any connections at some poin "Laura Hilby" <lhilby (AT) eims-inc (DOT) com> wrote in news:403a9509 (AT) newsgroups (DOT) borland.com: Quote: I was asking for help not a slap on the face.There are quite a bit of It wasnt a slap in the face - I told you steps to resolve it. Im not here to write code for you. Quote: people complaining about your answers in the newsgroup. Then fine - I'll simply add you to my kill file. Im not obligated to answer your questions or anyone elses. Quote: My server app was build on your server demo so if my listener thread becomes deadlock that means your demo will produce the same thing. Its not my demo. -- Chad Z. Hower (a.k.a. Kudzu) - http://www.hower.org/Kudzu/ "Programming is an art form that fights back" Need extra help with an Indy problem? http://www.atozed.com/indy/experts/ Back to top Eric Jansen Guest Posted: Tue Feb 24, 2004 10:39 am    Post subject: Re: TIDTCPServer doesn't accept any connections at some poin "Laura Hilby" <lhilby (AT) eims-inc (DOT) com> schreef in bericht news:403a75fe (AT) newsgroups (DOT) borland.com... Quote: 1.If it is aborting silently, what can I do about it? 2.If is deadlocked can I take it out of this status? How? Unfortunately I have no Indy experience (I use D5 & ICS, and I am thankful if I see what kind of help Mr Kudzu is giving here), but I can tell you this: If the listening thread is aborted silently (I don't know what Remy means by this exactly; maybe an Abort exception or a stack overflow) or if the thread is deadlocked, the thread will not running its main loop anymore. The listening thread is probably running in a message loop, and in this loop you could increment a counter to see if the thread is still running. This is a method I sometimes use. If the message loop is still active, you know at least that there is no deadlock and no exception. If the loop is no longer active, the only thing I can suggest is add logging code (on entry&exit of key procedures) to find out where things go wrong. hth, Eric Jansen Back to top Dean Guest Posted: Tue Feb 24, 2004 11:08 am    Post subject: Re: TIDTCPServer doesn't accept any connections at some poin Some good advice in Erics post, although I personally would skip straight to this part:- Quote: add logging code (on entry&exit of key procedures) to find out where things go wrong. I do this everywhere now, in all my code during the debug process. Make sure your errorlogger, however you do it, is threadsafe. Dean Back to top Martin James Guest Posted: Tue Feb 24, 2004 12:46 pm    Post subject: Re: TIDTCPServer doesn't accept any connections at some poin "Laura Hilby" <lhilby (AT) eims-inc (DOT) com> wrote Quote: 1.If it is aborting silently, what can I do about it? 2.If is deadlocked can I take it out of this status? How? Listener threads are usually just loops, basically: repeat listen; newSocket:=accept; startAclientThread(newSocket); until forever; It should be reasonably easy to log these operations to a file so as to narrow down the problem area. There is only one listener thread, so you can just open a file & write to it. There is the danger that the file operations will slow down your listener thread to the point that your original problem gets masked, OTOH, the extra delays may well show up your bug earlier/with less loading. The only way I can think of to log quicker is vastly more complex & needs a dedicated logger thread & pool of buffers, so I would suggest the simple file open/write as a first attempt. You could display the steps dirctly in a memo or terminal component, but this again involves extra problems with synchronizing or messaging the main thread. There is probably an exception handler in the listener - don't forget to put a log write of the exception.message in there too. Rgds, Martin Back to top Laura Hilby Guest Posted: Tue Feb 24, 2004 7:16 pm    Post subject: Re: TIDTCPServer doesn't accept any connections at some poin Thank you to Remy, Eric, Dean and Martin. I realy appreciate it. Because the problem doesn't happen that often and it happens only on my client sites (I wasn't able to reproduce it on my developer or testing machine) and my client doesn't bother to let me know all the time it is hard to monitor and debug the problem. I added writting to a log in the OnListenerException and now I just have to wait for it to happen again. I think it is related to the high load on some days(the sites are movie theatres). A quick solution would be to add a client in the same app and use the client to test the server once in a while and when the cleint is not connecting just restart the server. But the quick solution would not help me to find out what is realy happening, for that I need to get into the socket code , there is no direct access to the listener thread from what I know. Does anyone know any way to access listener thread from anywere else beside OnListenerException? Thanks again, Laura "Martin James" <mjames_falcon (AT) dial (DOT) pipex.com> wrote Quote: "Laura Hilby" <lhilby (AT) eims-inc (DOT) com> wrote in message news:403a75fe (AT) newsgroups (DOT) borland.com... 1.If it is aborting silently, what can I do about it? 2.If is deadlocked can I take it out of this status? How? Listener threads are usually just loops, basically: repeat listen; newSocket:=accept; startAclientThread(newSocket); until forever; It should be reasonably easy to log these operations to a file so as to narrow down the problem area. There is only one listener thread, so you can just open a file & write to it. There is the danger that the file operations will slow down your listener thread to the point that your original problem gets masked, OTOH, the extra delays may well show up your bug earlier/with less loading. The only way I can think of to log quicker is vastly more complex & needs a dedicated logger thread & pool of buffers, so I would suggest the simple file open/write as a first attempt. You could display the steps dirctly in a memo or terminal component, but this again involves extra problems with synchronizing or messaging the main thread. There is probably an exception handler in the listener - don't forget to put a log write of the exception.message in there too. Rgds, Martin Back to top Remy Lebeau (TeamB) Guest Posted: Tue Feb 24, 2004 8:25 pm    Post subject: Re: TIDTCPServer doesn't accept any connections at some poin "Eric Jansen" <eric (AT) nohost (DOT) nl> wrote Quote: If the listening thread is aborted silently (I don't know what Remy means by this exactly; maybe an Abort exception or a stack overflow) I mean simply that that thread could detect a non-exception WinSock error return value and then Terminate() itself. Quote: The listening thread is probably running in a message loop It is running a loop, but it has nothing to do with messages. It simply calls accept() in a loop, which then blocks the thread until a new connection arrives, at which time a new TIdPeerThread is created to handle the connection, and the loop returns to call accept() again. Quote: and in this loop you could increment a counter to see if the thread is still running. You have no access to, or control over,the listening thread, unless you re-write Indy's source code. It is an internal thread for TIdTCPServer's private use only. Gambit Back to top Remy Lebeau (TeamB) Guest Posted: Tue Feb 24, 2004 8:26 pm    Post subject: Re: TIDTCPServer doesn't accept any connections at some poin "Martin James" <mjames_falcon (AT) dial (DOT) pipex.com> wrote Quote: repeat listen; The listen is not performed in the loop, or even the same thread at all. Quote: There is only one listener thread There is one listener thread per Binding, not globally. 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