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Full Discussion: Can we write a multiple thread to receive from a single socket file descriptor
Special Forums IP Networking Can we write a multiple thread to receive from a single socket file descriptor Post 302174401 by sumitpandya on Tuesday 11th of March 2008 03:47:34 AM
Old 03-11-2008
Use AIO or Thread Pool
Multiple threads can definately listen to single socket. All threads can be blocked on "select" or "poll" system-call. Now depending on number of CPU your that many number of threads will come out of select/poll system call then if its TCP you mandatory call "accept" system-call. Here only 1 thread will succeed and remaining threads will fails which again go back to select/poll system-call. Now if instead of TCP you using UDP then same above syncronization will happen at "read" system-call and remaining threads has to go back at select/poll. Pseudo code will look like

while(1) {
select(sockfd);
rs = accept(sockfd);
if(rs == -1) continue;
thread_function();
}

But from past-experience. I'd recommend you to re-design of your software with producer and worker concept. One thread will read data on socket then it will select a thread from pool and assign work to that.
From our statistics I'd say 1GHz CPU can efficiently hangle 25 complex threads only!!! And for multithreads instead of deploying higher capacity of CPU you should go for higher multi-core procerrors only!!!
 

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LEARN ABOUT OSF1

shutdown

shutdown(2)							System Calls Manual						       shutdown(2)

NAME

       shutdown - Shuts down socket send and receive operations

SYNOPSIS

       #include <sys/socket.h>
       int shutdown (	   int socket,	    int how );

STANDARDS

       Interfaces documented on this reference page conform to industry standards as follows:

       shutdown():  XNS5.0

       Refer to the standards(5) reference page for more information about industry standards and associated tags.

PARAMETERS

       Specifies the file descriptor of the socket.  Specifies the type of shutdown.  Values are: To disable further receive operations To disable
       further send operations To disable further send operations and receive operations

DESCRIPTION

       The shutdown() function disables receive and/or send operations on the specified socket.

RETURN VALUES

       Upon successful completion, a value of 0 (zero) is returned.  Otherwise, a value of -1 is returned and errno is set to indicate the error.

ERRORS

       If the shutdown() function fails, errno may be set to one of the following values: The socket parameter is not valid.  The how argument	is
       invalid.   Insufficient	resources are available in the system to complete the call.  The available STREAMS resources were insufficient for
       the operation to complete.  The socket is not connected.  The socket parameter refers to a file, not a socket.

RELATED INFORMATION

       Functions: getsockopt(2), read(2), recv(2), recvfrom(2), recvmsg(2), select(2), send(2), sendto(2), setsockopt(2), socket(2), write(2)

       Standards: standards(5) delim off

																       shutdown(2)
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