Question

wait/notify example

Asked by: DJ_AM_Juicebox

Hi,

Can someone provide me with a sample wait/notify sample in Java? What kind of common things do I have to watch out for when working with wait/notify? I'm very familiar with C++ multithreading so if you can just give me a small example I should be able to figure it out. I heard the multithreading system in Java is 'broken' btw, is this true?

Thanks

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Asked On
2006-12-17 at 16:57:13ID22096160
Tags

notify

,

wait

,

example

Topic

Java Programming Language

Participating Experts
2
Points
500
Comments
2

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Answers

 

by: objectsPosted on 2006-12-17 at 17:04:02ID: 18156189

 

by: x4uPosted on 2006-12-17 at 20:31:05ID: 18156646

Java's synchronization is not broken at all, it is perfectly reliable. There has been some fuss about a commonly used pattern known as double checked locking some years ago. But this doesn't mean the synchronized sections were ever broken, it was just a problem that could have existed if there would have been a implementation of a Java VM that reorganizes instructions to execute them out of order which would have been legal according to the java spec at this time. The fix for this was just a specification update.

http://www.cs.umd.edu/~pugh/java/memoryModel/DoubleCheckedLocking.html
http://jcp.org/en/jsr/detail?id=133

20120131-EE-VQP-002

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