take one of the topics in the readings, find a reference outside our readings ta

Question

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

Some suggested topics:

Spin locks

Atomic read/write operations vs the real world

Sequentially consistent memory

Memory barrier instructions

Test and set locks: getAndSet (), compareAndSet ()

Monitors, locks, conditions

Locked queue

Lost wake up events

Readers writers locks

Reentrant locks

Semaphores

Threads - creating and running them

Thread structure of the JVM and the Java GUI classes

Race conditions and deadlocks

Writing a concurrent program

condition variables

producer-consumer problem

finding objects

active, passive and control objects

Explanation / Answer

Spinlock:

A spinlock is a lock mechanism which causes a thread and trying to acquire it to simply wait in a loop and then it repeat while checking taht if the lock is available or not.In that situations the thread remains active but not performing a task, the main use of such lock is waiting.After that spinlocks will usually be held until they are explicitly released. Spin locks are kernel-defined and it can be used to protect shared data.Alomst each and every component use spin locks, including drivers.The main point here is spinlocks are efficient if thread blocks for only short periods.In this short situations only kernels use spinlocks. As like spinlocks become wasteful if held for they are longer durations. Because the longer block causes the greater the risk that the thread will be interrupted by the OS scheduler. If this happens, other threads will be left spinning.What the next happend is is an infinite postponement until the thread holding the lock can finish.

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