SynchronousQueue evolution

Simply interesting info:

"In Mustang (Java 6.0), the lock-based SynchronousQueue algorithm is being replaced with a new nonblocking version. Few developers use SynchronousQueue directly, but it is used as the work queue for thread pools constructed with the Executors.newCachedThreadPool() factory. Benchmark tests comparing cached thread pool performance show that the new nonblocking synchronous queue implementation offers close to three times the speed over the current implementation. And further improvements are planned for the release following Mustang, codenamed Dolphin."