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Inside Macintosh: Operating System Utilities /

Chapter 6 - Queue Utilities

This chapter describes how your application can directly add elements to and remove them from an operating-system queue. The Macintosh Operating System stores some of the information it uses in data structures called queues. The Queue Utilities allow you to manipulate those queues directly by adding and removing elements.

Ordinarily, you do not need to use the Queue Utilities. The Operating System itself is responsible for managing the various operating-system queues that it creates internally, and you should manipulate those queues only indirectly. For example, to add an element to the notification queue maintained by the Notification Manager, you should call the NMInstall function. To remove an element from that queue, you should call the NMRemove function. But if you discover some unusual need for adding or removing such elements directly, you can use the Queue Utilities routines. In addition, you can use the Queue Utilities routines for directly manipulating queues that you create.

This chapter describes the general structure of operating-system queues and then

Chapter Contents
About Queues
The Queue Header
The Queue Element
Using the Queue Utilities
Searching for an Element in an Operating-System Queue
Adding Elements to an Operating-System Queue
Removing Elements From an Operating-System Queue
Queue Utilities Reference
Data Structures
Queue Headers
Queue Elements
Summary of the Queue Utilities
Pascal Summary
Data Types
C Summary
Data Types
Assembly-Language Summary
QHdr Data Structure
QElem Data Structure
Result Codes

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© Apple Computer, Inc.
6 JUL 1996

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