Hi All,
I'm a newbie to libev. I wrote a TCP server with libev. My program has a
relatively simple structure, with accept_cb, read_cb, write_cb and
timeout_cb defined. However, when I started it, I found the accept call back
is called right away and being called about 60K+ times per second. Each
"accept()" call sets the errno to EINVAL, since there's no connection. The
program uses more than 50% CPU time.
My question is that if this is correct? Or there could be something wrong
with my program? If this is expected, then do I need to let the accept_cb to
sleep to avoid making the CPU too busy? But wouldn't sleeping affect the
performance of the server?
Thanks for your attention!
Shawn
Part of my source code:
In main(),
===============
int svrSockFd = setupServerSocket(SOCK_STREAM, g->m_ip, g->m_port);
// Make socket non-blocking.
fcntl(svrSockFd, F_SETFL, O_NONBLOCK);
ev_io* acceptWatcher = (ev_io*)malloc(sizeof(ev_io));
// Init watcher
ev_io_init(acceptWatcher, accept_cb, svrSockFd, EV_READ);
// Start watcher
struct ev_loop* loop = EV_DEFAULT;
ev_io_start(loop, acceptWatcher);
// Wait for events to arrive
ev_run(loop, 0);
The accept_cb:
=====================
static void accept_cb(struct ev_loop* loop, ev_io* w, int revents)
{
Log::debug("serverSocket received data");
int svrSockFd = w->fd;
// accept
sockaddr_in clientAddress;
socklen_t sin_size = (socklen_t)sizeof(clientAddress);
int newSockFd = accept(svrSockFd, (sockaddr *)&clientAddress, &sin_size);
if (newSockFd < 0) { // -1, EAGAIN??
if (errno == EINVAL) {
//cout << "no connection" << endl;
} else {
perror("accept");
}
} else {
// Handle the connection
...
}
}
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