public DatagramChannelImpl(SelectorProvider sp) throws IOException {
super(sp);
ResourceManager.beforeUdpCreate();
try {
this.family =
Net.isIPv6Available() ? StandardProtocolFamily.INET6 : StandardProtocolFamily.INET;
this.fd = Net.socket(family, false);
this.fdVal = IOUtil.fdVal(fd);
this.state = ST_UNCONNECTED;
} catch (IOException ioe) {
ResourceManager.afterUdpClose();
throw ioe;
}
}
/** Closes the socket. */
protected void close() throws IOException {
synchronized (fdLock) {
if (fd != null || fd1 != null) {
if (!stream) {
ResourceManager.afterUdpClose();
}
if (fdUseCount == 0) {
if (closePending) {
return;
}
closePending = true;
socketClose();
fd = null;
fd1 = null;
return;
} else {
/*
* If a thread has acquired the fd and a close
* isn't pending then use a deferred close.
* Also decrement fdUseCount to signal the last
* thread that releases the fd to close it.
*/
if (!closePending) {
closePending = true;
fdUseCount--;
socketClose();
}
}
}
}
}
protected void implCloseSelectableChannel() throws IOException {
synchronized (stateLock) {
if (state != ST_KILLED) nd.preClose(fd);
ResourceManager.afterUdpClose();
// if member of mulitcast group then invalidate all keys
if (registry != null) registry.invalidateAll();
long th;
if ((th = readerThread) != 0) NativeThread.signal(th);
if ((th = writerThread) != 0) NativeThread.signal(th);
if (!isRegistered()) kill();
}
}