Concurrent put calls on a BlockingQueue in Java

Question

I know that concurrent adds to an stl queue in c++ can cause issues, and the way to solve this is adding a mutex lock around all add/remove calls.

But I am programming in Java at the moment, and I'm using BlockingQueue. The documentation only says that the thread that calls put/take on a BlockingQueue object gets blocked implicitly until there's room to put/there's something to take respectively. However, it does not mention anything about concurrent put/take calls. Would I need to protect these with a mutex lock?

Bozho · Accepted Answer · 2011-07-25 06:03:55Z

No, blocking-queues are thread-safe. From the docs:

BlockingQueue implementations are thread-safe. All queuing methods achieve their effects atomically using internal locks or other forms of concurrency control

I was a little unclear about that wording, so thanks for confirming!

phihag · Accepted Answer · 2011-07-25 06:04:15Z

From the documentation:

BlockingQueue implementations are thread-safe.

Therefore, you don't need a lock.

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