For this week, take one of the topics in the readings, find a reference outside

Question

For this week, take one of the topics in the readings, find a reference outside our readings talking about that topic cite your reference tell us a little about how the two presentations relate to each other tell us what you have learned about that topic from your readings e e e e e Some suggested topics: 1. Spin locks 2. Atomic read/write operations vs the real world 3. Sequentially consistent 4. Memory barrier instructions 5. Test and set locks: getAndSet,compareAndSet ( 6. Monitors, locks, conditions 7. Locked queue 8. Lost wake up events 9. Readers writers locks memory 10. Reentrant locks 11. Semaphores 12. Threads -creating and running them 13. Thread structure of the JVM and the Java GUI classes 14. Race con 15. Writing a concurrent program ditions and deadlocks a. condition variables b. producer-consumer problem c. finding objects d. active, passive and control objects

Explanation / Answer

Solution:

Topic: Spin Locks

Spinlock is a locking mechanism. If a thread is waiting for a blocked resource the thread will spin until the resource is available. This is called busy waiting. Because the thread is active but will go nothing.

The alternative is a mutex. In this the thread will be put in a queue and when the resource is free. The OS will activate the thread. Here Locking/Unlocking is very heavy but the wait time is 0.

Spinlocks are useful when you already know that wait time is going to be very low.

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