1. © 2002, Mike Murach & Associates, Inc.
JAVA, C20
© 2002, Mike Murach & Associates, Inc.

2. © 2002, Mike Murach & Associates, Inc.
JAVA, C20
© 2002, Mike Murach & Associates, Inc.

3. © 2002, Mike Murach & Associates, Inc.
Concept of Threads
What is a thread?
- is a single sequential flow of control within a program and completes the specific task.
Why thread?
- multitasking can improve performance by multithreading technology
- improve efficiency
How thread works?
- thread schedule determines which thread runs at a give time
When use threads?
- used to allow a time-consuming task to occur in the background
JAVA, C20
© 2002, Mike Murach & Associates, Inc.

4. © 2002, Mike Murach & Associates, Inc.
JAVA, C20
© 2002, Mike Murach & Associates, Inc.

5. © 2002, Mike Murach & Associates, Inc.
JAVA, C20
© 2002, Mike Murach & Associates, Inc.

6. © 2002, Mike Murach & Associates, Inc.
JAVA, C20
© 2002, Mike Murach & Associates, Inc.

7. © 2002, Mike Murach & Associates, Inc.
JAVA, C20
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8. © 2002, Mike Murach & Associates, Inc.
JAVA, C20
© 2002, Mike Murach & Associates, Inc.

9. © 2002, Mike Murach & Associates, Inc.
JAVA, C20
© 2002, Mike Murach & Associates, Inc.

10. © 2002, Mike Murach & Associates, Inc.
JAVA, C20
© 2002, Mike Murach & Associates, Inc.

11. © 2002, Mike Murach & Associates, Inc.
JAVA, C20
© 2002, Mike Murach & Associates, Inc.

12. © 2002, Mike Murach & Associates, Inc.
More complete examples in textbook CD: BookExamples/Ch20/20-04/
JAVA, C20
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13. © 2002, Mike Murach & Associates, Inc.
JAVA, C20
© 2002, Mike Murach & Associates, Inc.

14. © 2002, Mike Murach & Associates, Inc.
JAVA, C20
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15. © 2002, Mike Murach & Associates, Inc.
More complete examples in textbook CD: BookExamples/Ch20/20-05/
JAVA, C20
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16. © 2002, Mike Murach & Associates, Inc.
JAVA, C20
© 2002, Mike Murach & Associates, Inc.

17. © 2002, Mike Murach & Associates, Inc.
JAVA, C20
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18. © 2002, Mike Murach & Associates, Inc.
JAVA, C20
© 2002, Mike Murach & Associates, Inc.

19. © 2002, Mike Murach & Associates, Inc.
JAVA, C20
© 2002, Mike Murach & Associates, Inc.

20. © 2002, Mike Murach & Associates, Inc.
More complete examples in textbook CD: BookExamples/Ch20/20-07/
JAVA, C20
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21. © 2002, Mike Murach & Associates, Inc.
JAVA, C20
© 2002, Mike Murach & Associates, Inc.

22. Concept of Synchronization in Threads
Asynchronous problems will occur when two or more threads are sharing data or/and sharing operation. For example: Producer-consumer relationship
Threads must be synchronized in order to cooperate each other to operate correctly
Java provides synchronized keyword to let a thread “exclusive-use” the shared resource until it’s finished to notify() other wait()ing thread to use
This technology is also called “monitor”
JAVA, C20
© 2002, Mike Murach & Associates, Inc.

23. © 2002, Mike Murach & Associates, Inc.
JAVA, C20
© 2002, Mike Murach & Associates, Inc.

24. © 2002, Mike Murach & Associates, Inc.
JAVA, C20
© 2002, Mike Murach & Associates, Inc.

25. © 2002, Mike Murach & Associates, Inc.
JAVA, C20
© 2002, Mike Murach & Associates, Inc.

26. © 2002, Mike Murach & Associates, Inc.
JAVA, C20
© 2002, Mike Murach & Associates, Inc.

27. © 2002, Mike Murach & Associates, Inc.
JAVA, C20
© 2002, Mike Murach & Associates, Inc.

28. © 2002, Mike Murach & Associates, Inc.
More complete examples in textbook CD: BookExamples/Ch20/20-10/
JAVA, C20
© 2002, Mike Murach & Associates, Inc.