34   function getOppositePortId(portId) { return portId ^ 1; }  argument
38   function PortImpl(portId, opt_name) {  argument
39     this.portId_ = portId;
80     var portId = this.portId_;
87     messagingNatives.PortRelease(portId);
88     unloadEvent.removeListener(portReleasers[portId]);
90     delete ports[portId];
91     delete portReleasers[portId];
97   function hasPort(portId) {  argument
98     return portId in ports;
103   function createPort(portId, opt_name) {  argument
104     if (ports[portId])
105       throw new Error("Port '" + portId + "' already exists.");
106     var port = new Port(portId, opt_name);
107     ports[portId] = port;
108     portReleasers[portId] = $Function.bind(messagingNatives.PortRelease,
110                                            portId);
111     unloadEvent.addListener(portReleasers[portId]);
112     messagingNatives.PortAddRef(portId);
142   function dispatchOnRequest(portId, channelName, sender,  argument
162     var port = createPort(portId, channelName);
216   function dispatchOnConnect(portId,  argument
233     if (ports[getOppositePortId(portId)])
252       return dispatchOnRequest(portId, channelName, sender,
267     var port = createPort(portId, channelName);
282   function dispatchOnDisconnect(portId, errorMessage) {  argument
283     var port = ports[portId];
286       messagingNatives.CloseChannel(portId, false);
299   function dispatchOnMessage(msg, portId) {  argument
300     var port = ports[portId];