BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  How to manage a connection queue ?          BorlandTalk.com Forum Index -> Delphi Internet Winsock View previous topic :: View next topic   Author Message Grosno Guest Posted: Tue Feb 17, 2004 12:57 am    Post subject: How to manage a connection queue ? Hye all ! I'm writing a server application based on custom implemntation of non-blocking windows sockets. For each accepted socket, I create a thread calling receive & send function of the socket in a repeat until loop. Due do bandwith limit, I must manage a connection queue. But I've no idea how to code that... Have you an idea ? Thanks by advance. Gros Back to top Remy Lebeau (TeamB) Guest Posted: Tue Feb 17, 2004 3:06 am    Post subject: Re: How to manage a connection queue ? "Grosno" <forumNFSPAM (AT) grosno (DOT) net> wrote Quote: For each accepted socket, I create a thread Why are you using non-blocking then? If each client has its own thread, then non-blocking will be harder, not easier, to manage. Blocking mode works better when threads are involved. Quote: Due do bandwith limit, I must manage a connection queue. What do you mean exactly? Only allowing one socket to actually read or write at a time? If so, then you shouldn't be using threads for that to begin with. Again, you are in a situation where you are making things harder to manage than they should be. Gambit Back to top GrosNo Guest Posted: Tue Feb 17, 2004 1:33 pm    Post subject: Re: How to manage a connection queue ? "Remy Lebeau (TeamB)" <gambit47.no.spam (AT) no (DOT) spam.yahoo.com> a écrit dans le message de news:40318361$1 (AT) newsgroups (DOT) borland.com... Quote: "Grosno" <forumNFSPAM (AT) grosno (DOT) net> wrote in message news:403166d5 (AT) newsgroups (DOT) borland.com... For each accepted socket, I create a thread Why are you using non-blocking then? If each client has its own thread, then non-blocking will be harder, not easier, to manage. Blocking mode works better when threads are involved. Cause I thought there is a limit of socket per thread (like 64 if I remember), so I must in all case work with multithread, even I use non blocking socket. The Winsock implementation I use works with non blocking socket, and I "must" work with it... (i don't know if the modification takes much time) Quote: Due do bandwith limit, I must manage a connection queue. What do you mean exactly? Only allowing one socket to actually read or write at a time? If so, then you shouldn't be using threads for that to begin with. Again, you are in a situation where you are making things harder to manage than they should be. No, I just want that not too much client send data at the same to the server... So I accept connection but I send a command to say that client must wait before sending data... Thanks for your answer. Quote: Gambit Back to top Chad Z. Hower aka Kudzu Guest Posted: Tue Feb 17, 2004 6:59 pm    Post subject: Re: How to manage a connection queue ? "GrosNo" <niakNOSPAME (AT) grosno (DOT) net> wrote in news:4032181c (AT) newsgroups (DOT) borland.com: Quote: Cause I thought there is a limit of socket per thread (like 64 if I remember), so I must in all case work with multithread, even I use non For some calls yes. -- Chad Z. Hower (a.k.a. Kudzu) - http://www.hower.org/Kudzu/ "Programming is an art form that fights back" Qualified help FAST with Indy Experts Support from the experts themselves: http://www.atozed.com/indy/experts/support.iwp Back to top Remy Lebeau (TeamB) Guest Posted: Tue Feb 17, 2004 8:00 pm    Post subject: Re: How to manage a connection queue ? "GrosNo" <niakNOSPAME (AT) grosno (DOT) net> wrote Quote: Cause I thought there is a limit of socket per thread (like 64 if I remember) It is possible to run hundreds of sockets at a time if you are using multiple threads. Quote: No, I just want that not too much client send data at the same to the server... So I accept connection but I send a command to say that client must wait before sending data... What you are asking for sounds like throttling. Simply slow down the threads from accessing their sockets. That could be simple as calling Sleep() periodically. If that is not what you are actually suggesting, then please explain your situation in more detail. Gambit Back to top Gros Guest Posted: Fri Feb 20, 2004 9:47 am    Post subject: Re: How to manage a connection queue ? Ok, my explanations were bads... I'm in a service application using non-blocking sockets. My application must deal with more than 64 users at time, so my server must be multithreaded. Each client must send a large amount of data, with the shortest connection time as possible. (clients connect with RTC and they pay for that). Imagine I've 100 clients connecting at the same time. All send data to the server. The bandwith will limit the transfert speed for each client to a very small value, and then each client connection will spend a lot of time. If I decide that only 10 clients of the 100 send data at the same time, their connection will be shorter, no ? When one of the 10 sending data has finish transfert, one of the first of the 90 waiting will start sending data... and so on. So I've 2 questions: - Is it better to manage a thread per client socket or a thread for 64 clients who loop on the 64 sockets ? - Is the connection queue realisable or not, and have you an idea on how to code it ? Thanks Grosno "Remy Lebeau (TeamB)" <gambit47.no.spam (AT) no (DOT) spam.yahoo.com> a écrit dans le message de news:40327119$1 (AT) newsgroups (DOT) borland.com... Quote: "GrosNo" <niakNOSPAME (AT) grosno (DOT) net> wrote in message news:4032181c (AT) newsgroups (DOT) borland.com... Cause I thought there is a limit of socket per thread (like 64 if I remember) It is possible to run hundreds of sockets at a time if you are using multiple threads. No, I just want that not too much client send data at the same to the server... So I accept connection but I send a command to say that client must wait before sending data... What you are asking for sounds like throttling. Simply slow down the threads from accessing their sockets. That could be simple as calling Sleep() periodically. If that is not what you are actually suggesting, then please explain your situation in more detail. Gambit Back to top Atle Smelvær Guest Posted: Fri Feb 20, 2004 11:42 am    Post subject: Re: How to manage a connection queue ? Is your server message handled, event handled or IOCP handled? How many threads you must have depend on the architecture of your server. To you have to manage 100, 1000 or 10000 connections, and how big is your bandwidth? -Atle Back to top Remy Lebeau (TeamB) Guest Posted: Fri Feb 20, 2004 9:15 pm    Post subject: Re: How to manage a connection queue ? "Gros" <gros (AT) gros (DOT) net> wrote Quote: I'm in a service application using non-blocking sockets. My application must deal with more than 64 users at time, so my server must be multithreaded. Then non-blocking is not the answer to begin with, since all socket operations would be controlled by a single thread. Quote: Each client must send a large amount of data, with the shortest connection time as possible. Then use blocking sockets instead. They are better suited for that. Quote: clients connect with RTC and they pay for that Windows is not a Real-Time OS to begin with, so you are not going to get Real-Time performance no matter what you do in your code. Quote: - Is it better to manage a thread per client socket or a thread for 64 clients who loop on the 64 sockets ? 1 thread per client when possible. If system resources is an issue, then perhaps you can use fibers and break the clients up into smaller groups. That way, you can have a single fiber per client, and have a single thread handling multiple fibers at a time, with multiple threads running to handle multiple groups, but yet have fewer threads running overall. 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