// AbstractInterruptibleChannel synchronizes invocations of this method
// using AbstractInterruptibleChannel.closeLock, and also ensures that this
// method is only ever invoked once. Before we get to this method, isOpen
// (which is volatile) will have been set to false.
//
protected void implCloseSelectableChannel() throws IOException {
synchronized (stateLock) {
isInputOpen = false;
isOutputOpen = false;
closeImpl();
// Signal native threads, if needed. If a target thread is not
// currently blocked in an I/O operation then no harm is done since
// the signal handler doesn't actually do anything.
//
if (readerThread != 0) NativeThread.signal(readerThread);
if (writerThread != 0) NativeThread.signal(writerThread);
// If this channel is not registered then it's safe to close the fd
// immediately since we know at this point that no thread is
// blocked in an I/O operation upon the channel and, since the
// channel is marked closed, no thread will start another such
// operation. If this channel is registered then we don't close
// the fd since it might be in use by a selector. In that case
// closing this channel caused its keys to be cancelled, so the
// last selector to deregister a key for this channel will invoke
// kill() to close the fd.
//
if (!isRegistered()) kill();
}
}
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();
}
}
public void shutdownOutput() throws IOException {
synchronized (stateLock) {
if (!isOpen()) throw new ClosedChannelException();
isOutputOpen = false;
shutdown(fd, SHUT_WR);
if (writerThread != 0) NativeThread.signal(writerThread);
}
}