Data Queue APIs--Categories - FTP Directory Listing - IBM

User Queue APIs
User Queue APIs
This chapter describes the user queue APIs, which let you create and delete user queues. User queues are
permanent objects with an object type of *USRQ. They provide a way for one or more processes to
communicate asynchronously.
You can use user queues to:
● Communicate between two processes asynchronously
● Store data in arrival sequence for later use
● Contain keyed messages
● Create a batch machine (For an example, see .)
● Permit better performance than the data queue interface
You can save and restore user queues. However, you can only save or restore its definition. You cannot
save or restore the messages in it. You cannot restore a user queue if a user queue with the same name
already exists in the library. You must provide programs to use this object type to enqueue and dequeue
messages.
The user queue APIs are:
● Create User Queue (QUSCRTUQ)
● Delete User Queue (QUSDLTUQ)
In addition to using these APIs, you can work with user queues through the following:
● ILE C programming language
● Delete User Queue (DLTUSRQ) command
● Machine interface (MI) instructions
For details about MI instructions, refer to the Machine Interface Functional Reference book, which is a
comprehensive reference to machine interface (MI) instructions. This book is not accessible online and
must be ordered from Mechanicsburg. For details about the DLTUSRQ command, see Control Language
information.
Top | Object API categories | APIs by category
[Information Center Home Page | Feedback ] [Legal | AS/400 Glossary]
http://infocntr.rchland.ibm.com/pubs/html/as400/v4r5/ic2924/info/apis/obj3.htm [10/4/1999 2:33:22 PM]