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Which of the following is an atomic operation?

azuki ooh
Greenhorn

Joined: Nov 07, 2008
Posts: 20
(a) temp = temp + 1;
(b) X = temp;
(c) int temp = X;

I read somewhere that assignment operation are atomic. Incremental operation is not. So I conclude that (c) is atomic. Am I right?
Henry Wong
author
Sheriff

Joined: Sep 28, 2004
Posts: 19059
    
  40

azuki ooh wrote:(a) temp = temp + 1;
(b) X = temp;
(c) int temp = X;

I read somewhere that assignment operation are atomic. Incremental operation is not. So I conclude that (c) is atomic. Am I right?


Yes, C is definitely atomic. B may also be atomic, depending on the data type and the JVM. Also, there are other issues, such as register caching. Atomic doesn't mean thread safe.

Henry


Books: Java Threads, 3rd Edition, Jini in a Nutshell, and Java Gems (contributor)
azuki ooh
Greenhorn

Joined: Nov 07, 2008
Posts: 20
Thanks!
 
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