/// <summary>
/// Checks if there is at least one message to read in the pipe.
/// </summary>
/// <returns> Returns <c>true</c> if there is at least one message to read in the pipe; <c>false</c> otherwise. </returns>
public bool CheckRead()
{
if (!m_inActive || (m_state != State.Active && m_state != State.Pending))
{
return(false);
}
// Check if there's an item in the pipe.
if (!m_inboundPipe.CheckRead())
{
m_inActive = false;
return(false);
}
// If the next item in the pipe is message delimiter,
// initiate termination process.
if (m_inboundPipe.Probe().IsDelimiter)
{
var msg = new Msg();
bool ok = m_inboundPipe.Read(ref msg);
Debug.Assert(ok);
Delimit();
return(false);
}
return(true);
}
public Command Recv()
{
Command cmd = null;
// bool ok =
m_cpipe.Read(ref cmd);
return(cmd);
}
public Command Recv(int timeout)
{
Command cmd = null;
// Try to get the command straight away.
if (m_active)
{
m_cpipe.Read(ref cmd);
if (cmd != null)
{
return(cmd);
}
// If there are no more commands available, switch into passive state.
m_active = false;
m_signaler.Recv();
}
// Wait for signal from the command sender.
bool rc = m_signaler.WaitEvent(timeout);
if (!rc)
{
return(null);
}
// We've got the signal. Now we can switch into active state.
m_active = true;
// Get a command.
bool ok = m_cpipe.Read(ref cmd);
Debug.Assert(ok);
return(cmd);
}
public Mailbox(String name)
{
m_cpipe = new YPipe <Command>(Config.CommandPipeGranularity, "mailbox");
m_sync = new object();
m_signaler = new Signaler();
// Get the pipe into passive state. That way, if the users starts by
// polling on the associated file descriptor it will get woken up when
// new command is posted.
Command cmd = m_cpipe.Read();
Debug.Assert(cmd == null);
m_active = false;
m_name = name;
}
public IOThreadMailbox([CanBeNull] string name, [NotNull] Proactor proactor, [NotNull] IMailboxEvent mailboxEvent)
{
m_proactor = proactor;
m_mailboxEvent = mailboxEvent;
m_cpipe = new YPipe <Command>(Config.CommandPipeGranularity, "mailbox");
m_sync = new object();
// Get the pipe into passive state. That way, if the users starts by
// polling on the associated file descriptor it will get woken up when
// new command is posted.
var cmd = new Command();
bool ok = m_cpipe.Read(ref cmd);
Debug.Assert(!ok);
m_name = name;
m_disposed = false;
}
protected override void ProcessHiccup(object pipe)
{
// Destroy old outpipe. Note that the read end of the pipe was already
// migrated to this thread.
Debug.Assert(m_outboundPipe != null);
m_outboundPipe.Flush();
while (m_outboundPipe.Read() != null)
{
}
// Plug in the new outpipe.
Debug.Assert(pipe != null);
m_outboundPipe = (YPipe <Msg>)pipe;
m_outActive = true;
// If appropriate, notify the user about the hiccup.
if (m_state == State.Active)
{
m_sink.Hiccuped(this);
}
}
