Accept (sockets) queuing up connection requests Post: 302509743

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Top Forums Programming Accept (sockets) queuing up connection requests Post 302509743 by Corona688 on Thursday 31st of March 2011 03:30:56 PM

03-31-2011

Registered User

Quote:

Originally Posted by Kam5FCC

Hi Corona,
Thanks for the reply.

What you are saying is correct if I was setting up a protocol and ack'ing all over the place. But what the boss wanted was a client that dumped off the data and left. Sooo....

TCP doesn't do that. The connecting process itself makes you wait.

Making your queue small will just prevent most of your clients from connecting at all when the server's busy, imagine russian roulette with 5/6 cylinders full.

Two ways to solve this.

1) Create threads to handle connections. The main program just does accept(); create_thread(); accept(); create_thread(); The threads do the communication. The clients won't have to wait for client1 to finish before they can connect. They might still wait a little just because connections take time to make -- you can't avoid that with TCP. And if the server's down, they'll wait an entire 10 minutes before giving up.

2) Use a connectionless protocol, probably UDP. Clients won't have to connect at all, just throwing a packet towards IP address 1.2.3.4 on port 5678 does the job. They won't even wait for the packet to get through, they won't even know if it gets through. The server can read and reply at its leisure.

Last edited by Corona688; 03-31-2011 at 04:41 PM..

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LEARN ABOUT DEBIAN

gems-server

GEMS-SERVER(1)							gems documentation						    GEMS-SERVER(1)

NAME

       gems-server - Transmit a shell session in real time.

SYNOPSIS

       gems-server [-ip ip] [-port p] [-maxconn n] [-wait m] [-log dest] [-noscript] [-script_bin script]

       gems-server -h | -v

DESCRIPTION

       Transmits a shell session to be shown in real time in various different computers or terminals.

       gems-server  transmits data in real time to clients via a network connection. Each one of these clients must run the gems-client(1) program
       to establish connection and receive the transmitted data. Clients can connect and disconnect at any given time, but  of	course	they  will
       only receive the data that is transmitted while they are connected (just like a radio transmission/reception system).

       The  gems  system is normally used to transmit a console session and show it in various computers at the same time, but it is also possible
       to transmit any other kind of data.

OPTIONS

       -ip    IP address where connections will be accepted.

       -port  TCP port. Default: 6666.

       -maxconn
	      Do not accept more than n simultaneous clients. Default: 25.

       -wait  Wait until m clients are connected before starting the transmission. This is useful to ensure that the first m clients will  receive
	      all data transmitted. The default behavior is to start transmission immediately, without waiting for client connections.

       -log   By  default,  the server does not write log messages. This option configures the destination of logs. The dest argument can be `sys-
	      log' (to log through syslogd(8)), `stderr' (to log through standard error output), or it can be an arbitrary filename (log  messages
	      will be appended to the file, if it exists).

       -noscript
	      By  default,  the  server  executes the script(1) program to take terminal data and transmit it. When this option is used the server
	      will not run script, and data will be read form standard input.

       -script_bin
	      Specifies the location of the script(1).	program. Default: /usr/bin/script.

       -h     Show a short help message.

       -v     Show version information.

FILES

       /var/lock/gems-server.PORT
	      Lock file.  gems-server creates this file on initialization and deletes it on exit. PORT is replaced by the TCP  port  used.   gems-
	      server will not run if this file is already present in the system.

AUTHORS

       Diego Essaya <dessaya@fi.uba.ar>

       Emiliano Castagnari <ecastag@fi.uba.ar>

SEE ALSO

       gems-client(1), script(1), syslogd(8)

gems								    AUGUST 2004 						    GEMS-SERVER(1)