Copyright 1997-2003 John D. Polstra.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgment:
* This product includes software developed by John D. Polstra.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
INTERFACE ChannelMux;
IMPORT Atom, IP, Rd, Thread, Wr;
IMPORT ConnFD;
TYPE
T <: ROOT;
Channel <: ConnFD.T;
ChannelID = [0..255];
VAR
Error atoms in addition to those defined in the IP and TCP
interfaces.
ProtocolError: Atom.T;
PROCEDURE Open(rd: Rd.T;
wr: Wr.T;
VAR (*OUT*) chan: Channel;
active: BOOLEAN): T
RAISES {IP.Error, Thread.Alerted};
Creates and initializes a new channel multiplexer communicating on
top of the given reader/writer pair.
PROCEDURE Listen(mux: T): ChannelID
RAISES {IP.Error};
Creates a new channel in the listening state, and returns its ID.
PROCEDURE Accept(mux: T; id: ChannelID): Channel
RAISES {IP.Error, Thread.Alerted};
Waits for an incoming connection on the given channel.
PROCEDURE Connect(mux: T; id: ChannelID): Channel
RAISES {IP.Error, Thread.Alerted};
Initiates a connection to the given channel.
PROCEDURE Close(mux: T);
Shuts down the packet multiplexer.
END ChannelMux.