Multithreaded applications

A thread is the path taken by a program while running, the steps performed, and the order in which the steps are performed.

The term thread is short for thread of control. A thread runs code from its starting location in an ordered, predefined sequence for a given set of inputs. You can use multiple threads to improve application performance by running different application tasks simultaneously.

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• Threads on i5/OS
  All programs have at least one thread, referred to as the initial thread. In a program with multiple threads, each thread runs its code independently of the other threads in the program.
• i5/OS thread management
  The concepts described here pertain to all programming languages.
• Thread safety
  A function is threadsafe if you can start it simultaneously in multiple threads within the same process. A function is threadsafe if and only if all the functions it calls are also threadsafe.
• Multithreaded programming techniques
  If you are going to write multithreaded applications or server applications for i5/OS™, you should be familiar with several techniques.
• Language access and threads
  Learn how different languages support threads on i5/OS™. This information can help you evaluate how threads can be implemented in your own application.
• Debugging and servicing of multithreaded jobs
  Use the concepts and techniques that are described here to learn about debugging and servicing multithreaded jobs:
• Performance considerations in multithreaded applications
  There are several performance considerations for multithreaded jobs on i5/OS™.
• Examples: Threads
  These examples are used throughout this topic.
• Related information for multithreaded applications
  Listed here are the manuals (in PDF format), Web sites, and information center topics that relate to the multithreaded applications topic. You can view or print any of the PDFs.