void closeMulticastSocket() {
if (mcast_sock != null) {
try {
if (mcast_addr != null) {
// by sending a dummy packet the thread will be awakened
sendDummyPacket(mcast_addr.getIpAddress(), mcast_addr.getPort());
Util.sleep(300);
mcast_sock.leaveGroup(mcast_addr.getIpAddress());
}
mcast_sock.close(); // this will cause the mcast receiver thread to break out of its loop
mcast_sock = null;
if (Trace.trace) {
Trace.info("UDP.closeMulticastSocket()", "multicast socket closed");
}
} catch (IOException ex) {
}
mcast_addr = null;
}
}
