/// <summary>
/// Get the next message from the <see cref="Maverick.SSH.Packets.SSHPacketRouter"/> that matches one of the
/// ids supplied in the message filter and return its index in the channels message store.
/// </summary>
/// <param name="channel"></param>
/// <param name="observer"></param>
/// <returns></returns>
protected internal SSHPacket NextMessage(SSHAbstractChannel channel, PacketObserver observer)
{
SSHPacketStore store = channel == null? global : channel.MessageStore;
PacketHolder holder = new PacketHolder();
while (!store.Closed && holder.msg == null)
{
// Check for an error from the buffering thread
if (buffered)
{
if (!isClosing)
{
if (lastError != null)
{
if (lastError is SSHException)
{
throw lastError;
}
else
{
throw new SSHException(lastError);
}
}
}
}
if (sync.RequestBlock(store, observer, holder))
{
try
{
BlockForMessage();
}
finally
{
// Release the block so that other threads may block or return with the
// newly arrived message
sync.ReleaseBlock();
}
}
}
return(holder.msg);
}
/// <summary>
/// Request to obtain the real block but check for messages first in the packet store.
/// </summary>
/// <param name="store"></param>
/// <param name="observer"></param>
/// <param name="holder"></param>
/// <returns></returns>
public bool RequestBlock(SSHPacketStore store, PacketObserver observer, PacketHolder holder)
{
lock (this)
{
//#if DEBUG
// System.Diagnostics.Trace.WriteLine(System.Threading.Thread.CurrentThread.Name + ": Obtained lock on sync");
//#endif
if ((holder.msg = store.HasMessage(observer)) != null)
{
//#if DEBUG
// System.Diagnostics.Trace.WriteLine(System.Threading.Thread.CurrentThread.Name + ": w00t I've found a message");
//#endif
return(false);
}
bool canBlock = !isBlocking;
if (canBlock)
{
//#if DEBUG
// System.Diagnostics.Trace.WriteLine(System.Threading.Thread.CurrentThread.Name + ": w00t I've got the *real* block");
//#endif
isBlocking = true;
}
else
{
//#if DEBUG
// System.Diagnostics.Trace.WriteLine(System.Threading.Thread.CurrentThread.Name + ": :( Waiting on sync in pseudo block");
//#endif
System.Threading.Monitor.Wait(this);
}
//#if DEBUG
// System.Diagnostics.Trace.WriteLine(System.Threading.Thread.CurrentThread.Name + ": Exiting RequestBlock");
//#endif
return(canBlock);
}
}
