BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Preventing the activation of the IdAntiFreeze mechanism          BorlandTalk.com Forum Index -> Delphi Internet Winsock View previous topic :: View next topic   Author Message Offir Bakshitz Guest Posted: Wed Jan 26, 2005 9:49 am    Post subject: Preventing the activation of the IdAntiFreeze mechanism Hi all, While debugging my application i noticed that every call to TIdTCPClient.Connect() yields the creation of a new thread. After Furthur study I realized that Indy has a mechanism that processes all messages to prevent the main thread from blocking while the application calls connect() from the main thread. Since my application creates a thread in which conenct() is called, If feel I do not need the extra "anti-freeze" thread. What is the right way to prevent indy from creating this anti-freeze thread? Is it indeed true that if I call TIdTCPClient.Connect() from a worker-thread I do not need the extra antifreeze thread? Thanks. Offir. Back to top Remy Lebeau (TeamB) Guest Posted: Wed Jan 26, 2005 10:29 am    Post subject: Re: Preventing the activation of the IdAntiFreeze mechanism "Offir Bakshitz" <nospam> wrote Quote: While debugging my application i noticed that every call to TIdTCPClient.Connect() yields the creation of a new thread. Correct, because the only way to abort a blocking connect is to close the socket from another thread. That is how Connect() implements its timeout capability. Quote: Since my application creates a thread in which conenct() is called, If feel I do not need the extra "anti-freeze" thread. The thread that Connect() creates is not an anti-freeze thread. TIdAntiFreeze does not do anything when called from a worker thread. The thread that Connect() creates handles the actual connecting itself. Quote: What is the right way to prevent indy from creating this anti-freeze thread? If a worker thread calls Connect(), TIdAntiFreeze is not used. As for the thread that controls the connect itself, there is no way to prevent that thread from being used. It is part of the implementation for Connect(). Remove the thread and the Timeout feature will no longer work. Gambit Back to top Offir Bakshitz Guest Posted: Wed Jan 26, 2005 11:08 am    Post subject: Re: Preventing the activation of the IdAntiFreeze mechanism The reason I am worried about the extra thread is that my application creates many (over a hundred) threads that besides DB operations also call connect(). I cannot affort having double this already high number of threads. My application defines a value for TIdTCPClient.ConnectTimeout, But if I set the TIdTCPClient.ConnectTimeout to zero, and call TIdTCPClient.Connect() (not from the main thread), then the extra thread will not be created, right? If I use ConnectTimeout = 0, will the thread that call connect() block forever or will there still be a timeout? (I am not really worried about being able to define this timeout, as long as there is one and not a block-forever). Back to top Remy Lebeau (TeamB) Guest Posted: Wed Jan 26, 2005 6:36 pm    Post subject: Re: Preventing the activation of the IdAntiFreeze mechanism "Offir Bakshitz" <nospam> wrote Quote: My application defines a value for TIdTCPClient.ConnectTimeout Are you using Indy 10? Quote: But if I set the TIdTCPClient.ConnectTimeout to zero, and call TIdTCPClient.Connect() (not from the main thread), then the extra thread will not be created, right? Correct. Quote: If I use ConnectTimeout = 0, will the thread that call connect() block forever or will there still be a timeout? (I am not really worried about being able to define this timeout, as long as there is one and not a block-forever). If the socket fails to connect to the server, an error will eventually occur. 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