private void AsyncPollCallback(IAsyncResult result)
{
WatchSocket socket = (WatchSocket)result.AsyncState;
bool ret = socket.EndPoll(result);
if (socket.Stopping)
{
// If we're stopping, don't process any results, and don't begin a new poll.
return;
}
if (ret)
{
PollInvokeableDelegate cb = new PollInvokeableDelegate(PollInvokeable);
Invoke(cb, socket.SDRef);
}
// The user may have stopped the socket during the Invoke above
if (!socket.Stopping)
{
AsyncCallback callback = new AsyncCallback(AsyncPollCallback);
socket.BeginPoll(-1, SelectMode.SelectRead, callback, socket);
}
}
/// <summary>
/// Starts polling the DNSService socket, and delegates
/// data back to the primary DNSService API when data arrives
/// on the socket.
/// </summary>
protected void SetupWatchSocket(IntPtr sdRef)
{
Int32 socketId = mDNSImports.DNSServiceRefSockFD(sdRef);
WatchSocket socket = new WatchSocket(socketId, sdRef);
sdRefToSocketMapping.Add(sdRef, socket);
AsyncCallback callback = new AsyncCallback(AsyncPollCallback);
IAsyncResult ar = socket.BeginPoll(-1, SelectMode.SelectRead, callback, socket);
}
/// <summary>
/// This method tears down a previously setup watch socket.
/// </summary>
protected void TeardownWatchSocket(IntPtr sdRef)
{
WatchSocket socket = (WatchSocket)sdRefToSocketMapping[sdRef];
if (socket != null)
{
socket.Stopping = true;
// Note that we did not actually stop the poll.
// This is because there is no way to actually stop the poll.
// Our only option is to wait for the poll to finish.
// And since we set the stopping variable, then no further action should be taken by the socket.
//
// This should be fine, since when the DNSServiceRefDeallocate(sdRef) method is invoked,
// the socket will be shutdown, and the poll will complete.
sdRefToSocketMapping.Remove(sdRef);
}
}
/// <summary>
/// Starts polling the DNSService socket, and delegates
/// data back to the primary DNSService API when data arrives
/// on the socket.
/// </summary>
protected void SetupWatchSocket(IntPtr sdRef)
{
Int32 socketId = mDNSImports.DNSServiceRefSockFD(sdRef);
WatchSocket socket = new WatchSocket(socketId, sdRef);
sdRefToSocketMapping.Add(sdRef, socket);
AsyncCallback callback = new AsyncCallback(AsyncPollCallback);
IAsyncResult ar = socket.BeginPoll(-1, SelectMode.SelectRead, callback, socket);
}
