CODEWITHSUNDEEP
c++client
Peter Lee
Peter Lee

Reputation: 13839

How to Implement the Server Waiting Loop(s) for Multiple Client Connections

I'm working on a Client-Server project. It should be able to handle multiple (>1000) client connections.

The main skeleton of my server-side waiting loop looks like this:

while(server->running)
{
    // If I remove this, my CPU use will be very intensive
    // but putting 10 milliseconds sleep will cause a significant delay
    // What's is the best practice?
    boost::this_thread::sleep(boost::posix_time::milliseconds(10));

    if (server->connectionQueue.empty())
        continue;

    Connection* conn = server->connectionQueue.front();
    server->connectionQueue.pop();

    Stream* stream = conn->HandleData();

    // More steps if needed here

    server->connectionQueue.push(conn);
}

My questions are:

  1. Currently I'm using one waiting loop for all connections. Is this correct? or what's the best practice? Should I use a waiting loop for each connection?

  2. If I remove the thread::sleep, my CPU use will be very intensive. But putting 10 milliseconds sleep will cause a significant delay, especially, if there are multiple connections. So what's is the best practice?

  3. I googled, and found something called FD_ISSET: http://linux.die.net/man/3/fd_isset

/* According to POSIX.1-2001 */
#include <sys/select.h>

/* According to earlier standards */
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>

int select(int nfds, fd_set *readfds, fd_set *writefds,
           fd_set *exceptfds, struct timeval *timeout);

void FD_CLR(int fd, fd_set *set);
int FD_ISSET(int fd, fd_set *set);
void FD_SET(int fd, fd_set *set);
void FD_ZERO(fd_set *set);

#define _XOPEN_SOURCE 600
#include <sys/select.h>

int pselect(int nfds, fd_set *readfds, fd_set *writefds,
            fd_set *exceptfds, const struct timespec *timeout,
            const sigset_t *sigmask);

But I don't know how to use? How can I use it for my Socket File Descriptor?

Not sure If I made myself clear.

Upvotes: 3

Views: 1000

Answers (1)

Josh
Josh

Reputation: 6473

I would recommend you have one main loop and use select() to manage your connection and listening sockets. Either man select_tut or visit http://beej.us/guide/bgnet/ (or both)

Upvotes: 1

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