Semaphore (VERY URGENT)

[Angela D'souza]

Hi,
Like in C Language we can implement Semaphore. Can we implement Semaphore in Java? If yes, which API?
Thanks,
Angela

[Rob Ross]

There is no API in the core java libraries for semaphores. You can build your own from the syncrhonization primatives in java if you wish.
Also, Doug Lea has written a library that does this already.
http://gee.cs.oswego.edu/dl/classes/EDU/oswego/cs/dl/util/concurrent/intro.html

[Jim Yingst]

Depending on what you want to do, many of the uses of semaphores are easier to implement in Java using the synchronized keyword. If you're already ruled that out for your application, then by all means use Doug Lea's libraries, which offer a far wider assortment of control mechanisms.

[Peter den Haan]

Please note that Angela has posted the same question (arguably more appropriately) in Threads (slap wrists).
- Peter

[Michael Ernest]

Thanks for the heads up, Peter. This topic is now closed.