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RPG Programming in ILE
CEEDOD – Decompose Operational Descriptor
Note: You cannot use these or any other ILE bindable APIs from within a program
created with DFTACTGRP(*YES). This is because bound calls are not
allowed in this type of program.
For more information on these ILE bindable APIs, see Chapter 9, “Running a
Program” on page 103 and also the
System API Reference
.
|
Multithreaded Applications
| The AS/400 now supports multithreading. ILE RPG does not directly support initi-
| ating or managing program threads. However, ILE RPG procedures can run as
| threads in multithreaded environments. If you want to call an ILE RPG procedure in
| a multithreaded application, you must ensure that the ILE RPG procedure is
| threadsafe. You must also ensure that any system functions that your procedure
| accesses are also threadsafe.
| The THREAD(*SEREALIZE) control specification keyword can be specified to help
| you achieve thread safety for an ILE RPG module. Specifying
| THREAD(*SERIALIZE) will protect most of your variables and all your internal
| control structures from being accessed improperly by multiple threads. The thread
| safe module will be locked when a procedure in the module is entered and
| unlocked when when no procedure in the module is still running. This serialized
| access, ensures that only one thread is active in any one module, within an acti-
| vation group, at any one time. However, it is still up to the programmer to handle
| thread safety for storage that is shared across modules. This is done by adding
| logic in the application to synchronize access to the storage.
| For more information, see “Multithreading Considerations” on page 157.
Chapter 2. RPG Programming in ILE 21