Java FAQ: Top Questions

LockSupport in java.util.concurrent.locks provides low-level thread-blocking primitives, used internally by concurrency utilities like ReentrantLock .

• Methods: park (block thread), unpark (resume thread).
• Permits: Each thread has a permit; unpark grants one, park consumes it or blocks.
• Flexibility: No need for locks or monitors, unlike wait/notify .
• Use Case: Building custom synchronizers or advanced concurrency constructs.