Thread: SIGINT not interrupting accept()

Hi.

I'm writing a FCGI-app and have come to a problem. I want to handle SIGINT to take down the server under control. But when handling SIGINT the accept-call doesn't get interrupted, so I have to refresh the browser to get use of the socket and then it closes.
I'm not directly familiar with signals. I obviously got it all wrong. Maybe it doesn't work as I think it does?

It's multithreaded and the main process set the signal handler

Code:

static void _signal_handler(int signum) {

	switch (signum) {
	case SIGINT:
		srv_logmsg(_srv, LOG_INFO, "Server shutdown received");
		FCGX_ShutdownPending();
		break;
	}

}

with

Code:

struct sigaction a;

a.sa_handler = _signal_handler;
a.sa_flags = 0;
sigemptyset(&a.sa_mask);
sigaction(SIGINT,  &a, NULL);

I'm using libfcgi as you can see. All threads are created into:

Code:

static void* _thread_start(void* p) {

	struct req req;
	struct srv* srv = (struct srv*) p;

	req_init(&req, srv);

	while (!srv->shutdown) {
		pthread_mutex_lock(&srv->mux_accept);
		if (!(srv->shutdown = FCGX_Accept_r(&req.fcgi))) {
			pthread_mutex_unlock(&srv->mux_accept);
			req_setup(&req, srv);
			FCGX_PutS("Status: 200 Ok\r\nContent-type: text/html\r\n\r\n"
					"Ok!", req.fcgi.out);
			req_reset(&req);
		} else {
			pthread_mutex_unlock(&srv->mux_accept);
			break;
		}
	}

	req_cleanup(&req);

}

And the main thread also enter that, after all threads are created.

FCGX_Requests are created with...

Code:

	FCGX_InitRequest(&req->fcgi, srv->fcgi_socket, FCGI_FAIL_ACCEPT_ON_INTR);

The interrupt on accept() works if I don't handle the interrupt my self, (but then we've don't get a clean shutdown either).