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Inside Macintosh: Networking /

Chapter 10 - Link-Access Protocol (LAP) Manager / LAP Manager Reference

Data Structures

The AppleTalk Transition Queue Entry

You use the AppleTalk Transition Queue entry record to specify an entry to be added
to the transition queue. The ATQEntry data type defines an AppleTalk Transition
Queue entry.

TYPE ATQEntry = 
RECORD
   qLink:      ATQEntryPtr;      {next queue entry}
   qType:      Integer;          {reserved}
   CallAddr:   ProcPtr;          {pointer to your routine}
END;

Field Description

qLink

A pointer to the next queue entry. Set this field to NIL; the LAP Manager fills it in when an application adds another entry to
the queue.

qType

Reserved.

CallAddr

A pointer to a transition event handler routine that you provide. The LAP Manager calls your routine when an AppleTalk transition event occurs.

Because you provide the memory for the AppleTalk Transition Queue entry, you can add as many fields to the end of the entry as you wish for your own purposes. Whenever your routine is called, the caller provides you with a pointer to the queue entry so that you can have access to the information you stored at the end of your queue entry.