I've been following a socket programming tutorial to make a simple TCP
communication program, seemingly without hitches, it appears to work fine.
However the structure of it is to have a server listening for requests from
a client using listen(), and when one connects, it communicates with that
client but only that one. It doesn't listen for more requests.
What I'm wondering is can I have a server that continually listens for
requests from multiple clients, and when *any* client connects, it can
communicate with that client. I'm thinking multithreading is obviously going
to be necessary in some form, but basically my questions are:
1) Can the server use a method similar to that described in the second
paragraph above to communicate with multiple clients at the same time on the
same port, or does it have to use a different port for each client that's
simultaneously communicating?
My initial hunch tells me that I can - because a web server can do it, but
is there anything special to watch out for such as how it has to integrate
with (2),...
2) Is it necessary to have multithreading, e.g. the server spawns a new
thread for each client that connects in order to communicate with that
client.
Sorry if I've overly crossposted but this seems to be relevant to MS C++ and
standard C++ as I'm intending to use it in linux aswell as windows, (the
only thing seemingly different in linux seems to be that it has different
includes and doesn't have to call WSAStartup).
11  2213 
Bonj <a@b.com> scribbled the following
on comp.lang.c: I've been following a socket programming tutorial to make a simple TCP
communication program, seemingly without hitches, it appears to work fine.
However the structure of it is to have a server listening for requests from
a client using listen(), and when one connects, it communicates with that
client but only that one. It doesn't listen for more requests.
Neither C or C++ has any socket, TCP, or other networking support
whatsoever. The fact that you are cross-posting to
microsoft.publi c.vc.language looks like you are using Microsoft
Windows. I advise therefore to ask on
comp.os.ms-windows.program mer.win32.
If, by any chance, you are using Unix, ask on comp.unix.progr ammer.
--
/-- Joona Palaste (pa*****@cc.hel sinki.fi) ------------- Finland --------\
\-------------------------------------------------------- rules! --------/
"This is a personnel commuter."
- Train driver in Scientific American
Yes.. You can have a server that listens at a desired port for
multiple-clients and communicates using that same port. If you are using
blocking socket, you will have to spawn a worker thread to handle each
client connection.
You probably want to take a look at the following article about blocking and
non-blocking socket : http://www.developerfusion.co.uk/show/28/8/
TanKC
"Bonj" <a@b.com> wrote in message news:34******** *****@individua l.net... I've been following a socket programming tutorial to make a simple TCP
communication program, seemingly without hitches, it appears to work fine.
However the structure of it is to have a server listening for requests
from a client using listen(), and when one connects, it communicates with that
client but only that one. It doesn't listen for more requests.
What I'm wondering is can I have a server that continually listens for
requests from multiple clients, and when *any* client connects, it can
communicate with that client. I'm thinking multithreading is obviously
going to be necessary in some form, but basically my questions are:
1) Can the server use a method similar to that described in the second
paragraph above to communicate with multiple clients at the same time on
the same port, or does it have to use a different port for each client that's
simultaneously communicating?
My initial hunch tells me that I can - because a web server can do it, but
is there anything special to watch out for such as how it has to integrate
with (2),...
2) Is it necessary to have multithreading, e.g. the server spawns a new
thread for each client that connects in order to communicate with that
client.
Sorry if I've overly crossposted but this seems to be relevant to MS C++
and standard C++ as I'm intending to use it in linux aswell as windows, (the
only thing seemingly different in linux seems to be that it has different
includes and doesn't have to call WSAStartup).
Ta very much, appreciate it
"TanKC" <kc*****@google .com> wrote in message
news:O7******** ********@TK2MSF TNGP15.phx.gbl. .. Yes.. You can have a server that listens at a desired port for
multiple-clients and communicates using that same port. If you are using
blocking socket, you will have to spawn a worker thread to handle each
client connection.
You probably want to take a look at the following article about blocking
and
non-blocking socket :
http://www.developerfusion.co.uk/show/28/8/
TanKC
"Bonj" <a@b.com> wrote in message news:34******** *****@individua l.net... I've been following a socket programming tutorial to make a simple TCP
communication program, seemingly without hitches, it appears to work
fine.
However the structure of it is to have a server listening for requests
from a client using listen(), and when one connects, it communicates with that
client but only that one. It doesn't listen for more requests.
What I'm wondering is can I have a server that continually listens for
requests from multiple clients, and when *any* client connects, it can
communicate with that client. I'm thinking multithreading is obviously
going to be necessary in some form, but basically my questions are:
1) Can the server use a method similar to that described in the second
paragraph above to communicate with multiple clients at the same time on
the same port, or does it have to use a different port for each client that's
simultaneously communicating?
My initial hunch tells me that I can - because a web server can do it,
but
is there anything special to watch out for such as how it has to
integrate
with (2),...
2) Is it necessary to have multithreading, e.g. the server spawns a new
thread for each client that connects in order to communicate with that
client.
Sorry if I've overly crossposted but this seems to be relevant to MS C++
and standard C++ as I'm intending to use it in linux aswell as windows, (the
only thing seemingly different in linux seems to be that it has different
includes and doesn't have to call WSAStartup).
Off topic for comp.lang.*
However, I suggest you look at some C++ libraries for this sort of thing.
e.g. CommonC++ or ACE.
e.g. http://www.gnu.org/software/commoncp...p-example.html
I wrote that a while back and I would do it very differently today.
Bonj wrote: I've been following a socket programming tutorial to make a simple TCP
communication program, seemingly without hitches, it appears to work fine.
However the structure of it is to have a server listening for requests from
a client using listen(), and when one connects, it communicates with that
client but only that one. It doesn't listen for more requests.
What I'm wondering is can I have a server that continually listens for
requests from multiple clients, and when *any* client connects, it can
communicate with that client. I'm thinking multithreading is obviously going
to be necessary in some form, but basically my questions are:
1) Can the server use a method similar to that described in the second
paragraph above to communicate with multiple clients at the same time on the
same port, or does it have to use a different port for each client that's
simultaneously communicating?
My initial hunch tells me that I can - because a web server can do it, but
is there anything special to watch out for such as how it has to integrate
with (2),...
2) Is it necessary to have multithreading, e.g. the server spawns a new
thread for each client that connects in order to communicate with that
client.
Sorry if I've overly crossposted but this seems to be relevant to MS C++ and
standard C++ as I'm intending to use it in linux aswell as windows, (the
only thing seemingly different in linux seems to be that it has different
includes and doesn't have to call WSAStartup).
Bonj wrote:
I've been following a socket programming tutorial to make a simple
TCP communication program, seemingly without hitches, it appears
to work fine. However the structure of it is to have a server
listening for requests from a client using listen(), and when one
connects, it communicates with that client but only that one. It
doesn't listen for more requests.
What I'm wondering is can I have a server that continually listens
for requests from multiple clients, and when *any* client connects,
it can communicate with that client. I'm thinking multithreading
is obviously going to be necessary in some form, but basically my
questions are:
1) Can the server use a method similar to that described in the
second paragraph above to communicate with multiple clients at the
same time on the same port, or does it have to use a different
port for each client that's simultaneously communicating? My
initial hunch tells me that I can - because a web server can do
it, but is there anything special to watch out for such as how it
has to integrate with (2),...
2) Is it necessary to have multithreading, e.g. the server spawns
a new thread for each client that connects in order to communicate
with that client.
Sorry if I've overly crossposted but this seems to be relevant to
MS C++ and standard C++ as I'm intending to use it in linux as
well as windows, (the only thing seemingly different in linux
seems to be that it has different includes and doesn't have to
call WSAStartup).
You are way off topic for c.l.c, and probably for c.l.c++ also,
both of which deal only with the portable ISO standardized
languages (which are not the same). The standard languages do not
contain sockets, multithreading, etc. You should read a newsgroup
for a while before posting into it. You should also set followups
to one group when initially posting a cross-posted inquiry.
--
"If you want to post a followup via groups.google.c om, don't use
the broken "Reply" link at the bottom of the article. Click on
"show options" at the top of the article, then click on the
"Reply" at the bottom of the article headers." - Keith Thompson
Bonj wrote: I've been following a socket programming tutorial to make a simple
TCP communication program, seemingly without hitches, it appears to work
fine. However the structure of it is to have a server listening for
requests from a client using listen(), and when one connects, it communicates with
that client but only that one. It doesn't listen for more requests.
What I'm wondering is can I have a server that continually listens
for requests from multiple clients, and when *any* client connects, it
can communicate with that client. I'm thinking multithreading is
obviously going to be necessary in some form, but basically my questions are:
Yes, more than one way exists to do what you're describing. You could
call listen() and fork on each accept(), or you could use the select()
system call. Forking on accept() generates overhead on process
creation/switching and is generally more cumbersome than using
select(). select() blocks and waits for input/output from user defined
file descriptors. When input/output arrives on one of these file
descriptors, select() returns the file descriptor in question, allowing
for efficient "multiplexi ng" of requests using only a single process.
As always, see select()'s man pages for more information.
1) Can the server use a method similar to that described in the
second paragraph above to communicate with multiple clients at the same time
on the same port, or does it have to use a different port for each client
that's simultaneously communicating?
My initial hunch tells me that I can - because a web server can do
it, but is there anything special to watch out for such as how it has to
integrate with (2),...
Yes, call the setsockopt() function with the SO_REUSEADDR parameter
set.
setsockopt(SOCK , SOL_SOCKET, SO_REUSEADDR,1)
-dave Yes, more than one way exists to do what you're describing. You could
call listen() and fork on each accept(), or you could use the select()
system call. Forking on accept() generates overhead on process
creation/switching and is generally more cumbersome than using
select().
Honestly in modern UNIX systems fork()ing doesn't have that much
overhead. It used to be that the entire process space had to be copied
to the new process, but now the page tables are simply marked
copy-on-write, and no actual copying of pages takes place except when
changes occur.
Jon
----
Learn to program using Linux assembly language http://www.cafeshops.com/bartlettpublish.8640017
"Bonj" <a@b.com> дÈëÓʼþ news:34******** *****@individua l.net... I've been following a socket programming tutorial to make a simple TCP
communication program, seemingly without hitches, it appears to work fine.
However the structure of it is to have a server listening for requests
from a client using listen(), and when one connects, it communicates with that
client but only that one. It doesn't listen for more requests.
What I'm wondering is can I have a server that continually listens for
requests from multiple clients, and when *any* client connects, it can
communicate with that client. I'm thinking multithreading is obviously
going to be necessary in some form, but basically my questions are:
1) Can the server use a method similar to that described in the second
paragraph above to communicate with multiple clients at the same time on
the same port, or does it have to use a different port for each client that's
simultaneously communicating?
My initial hunch tells me that I can - because a web server can do it, but
is there anything special to watch out for such as how it has to integrate
with (2),...
2) Is it necessary to have multithreading, e.g. the server spawns a new
thread for each client that connects in order to communicate with that
client.
Sorry if I've overly crossposted but this seems to be relevant to MS C++
and standard C++ as I'm intending to use it in linux aswell as windows, (the
only thing seemingly different in linux seems to be that it has different
includes and doesn't have to call WSAStartup).
There are several ways to do that without multithreading.
You can use select in linux and WaitForMultiple Objects in windows.
"Bonj" <a@b.com> дÈëÓʼþ news:34******** *****@individua l.net... I've been following a socket programming tutorial to make a simple TCP
communication program, seemingly without hitches, it appears to work fine.
However the structure of it is to have a server listening for requests
from a client using listen(), and when one connects, it communicates with that
client but only that one. It doesn't listen for more requests.
What I'm wondering is can I have a server that continually listens for
requests from multiple clients, and when *any* client connects, it can
communicate with that client. I'm thinking multithreading is obviously
going to be necessary in some form, but basically my questions are:
1) Can the server use a method similar to that described in the second
paragraph above to communicate with multiple clients at the same time on
the same port, or does it have to use a different port for each client that's
simultaneously communicating?
My initial hunch tells me that I can - because a web server can do it, but
is there anything special to watch out for such as how it has to integrate
with (2),...
2) Is it necessary to have multithreading, e.g. the server spawns a new
thread for each client that connects in order to communicate with that
client.
Sorry if I've overly crossposted but this seems to be relevant to MS C++
and standard C++ as I'm intending to use it in linux aswell as windows, (the
only thing seemingly different in linux seems to be that it has different
includes and doesn't have to call WSAStartup).
There are several ways to do that without multithreading.
You can use select in linux and WaitForMultiple Objects in windows. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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