In Java, is it required to use thread wait() and notify() within a synchronized block?
- 3This question is confusing because if you are going to use wait() it must be inside a synchronized block, but if you are going to use a synchronized block it is not mandatory to have a wait/notify, which situation is the one you are asking about?ilcavero– ilcavero2013-02-13 23:14:34 +00:00Commented Feb 13, 2013 at 23:14
- 1When the threads need to pass data around, it’s not enough to say “don’t run on the same data while I am running” but each thread must tell another thread that “I have some data for you”. In this case we require thread wait and notify. So synchronized behavior is different from wain/notifyDeadManSpirit– DeadManSpirit2013-02-13 23:17:50 +00:00Commented Feb 13, 2013 at 23:17
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2 Answers
No. Java will automatically ensure the marked section is entered by one and only one thread.
http://tutorials.jenkov.com/java-concurrency/synchronized.html
see also this question: java: wait(), notify() and synchronized blocks
Hmm.. seems to be some language issues.
You are not required to use wait and notify in a synchronized block, but if you want to use wait and notify, they must be used within a synchronized block.
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in short, yes. The thread must own the object's monitor before calling wait or notify.
