我正在努力了解公平财产在
Semaphore
年级的有用性.
具体地引用Javadoc提到:
Generally,semaphores used to control resource access should be initialized as fair,to ensure that no thread is starved out from accessing a resource. When using semaphores for other kinds of synchronization control,the throughput advantages of non-fair ordering often outweigh fairness considerations.
有人可以提供一个例子,在这里可能需要驳船.我不能想到过去的资源访问用例.另外,为什么默认是非公平的行为?
最后,使用公平行为有什么性能影响?