第一个问题比较好理解: Process A:1spin_lock(&list_lock);2if(list_empty(&list_head)){3spin_unlock(&list_lock);4set_current_state(TASK_INTERRUPTIBLE);5schedule();6spin_lock(&list_lock);7}89/* Rest of the code ... */10spin_unlock(&list_lock);Process B:100spin_lock(&list_lock);...
问题起源 事情得从一个多线程编程里面臭名昭著的问题"Lost wake-up problem"说起。 这个问题并不是说只在Java语言中会出现,而是会在所有的多线程环境下出现。 假如我们有两个线程,一个消费者线程,一个生产者线程。生产者线程的任务可以简化成将count加一,而后唤醒消费者;消费者则是将count减一,而后在减到0的时...
如果消费者线程在检测count<=0,在执行wait()之前,生产者线程执行了count+1,并执行notify()唤醒,但是消费者线程并没有执行到wait(),导致唤醒失效,消费者线程会无法唤醒,该问题就是Lost Wake-Up Problem。 错误时序 如何解决该问题呢,可以将obj.wait()和obj.notify()放进obj对象锁的同步块中: 生产者伪代码: s...
事情得从一个多线程编程里面臭名昭著的问题"Lost wake-up problem"说起。 这个问题并不是说只在Java语言中会出现,而是会在所有的多线程环境下出现。 假如我们有两个线程,一个消费者线程,一个生产者线程。生产者线程的任务可以简化成将count加一,而后唤醒消费者;消费者则是将count减一,而后在减到0的时候陷入睡眠...
这就是所谓的lost wake up问题。 解决办法 Java强制我们的wait()/notify()调用必须要在一个同步块中,就是不想让我们在不经意间出现这种lost wake up问题。否则会抛出IllegalMonitorStateException。 不仅仅是这两个方法,包括java.util.concurrent.locks.Condition的await()/signal()也必须要在同步块中: ...
//好吧,我竟然写了个死锁。在mianbao==0 或者20的时候可能发生死锁 class Lanzi { public volatile int mianbao = 0; public static final int MAX = 20; public static final int min = 0; public Object proObj…
aI wouf dlike to be with you foreve I是wouf dlike以您foreve[translate] aNot lost heart, is also lost, no matter how wake up, sleep is also slowly dying Not lost heart, is also lost, no matter how wake up, sleep is also slowly dying[translate]...
The live attenuated vaccine is considered the most effective, but there is a worry: what might happen once these viruses wake upAlthough vaccination is one of the best ways to protect us from COVID-19, it can be better.【1】How many Americans have died from the COVID-19 pandemicA.Over...
The Lost Weekend: Directed by Billy Wilder. With Ray Milland, Jane Wyman, Phillip Terry, Howard Da Silva. The desperate life of a chronic alcoholic is followed through a four-day drinking bout.
ahave to wake up at 6 tomorrow 必须明天醒在6[translate] a原来陈旧的教学楼已经变成了崭新高大的教学楼 The original obsolete classroom building already turned the brand-new big classroom building[translate] aD. reinforced D. 加强[translate]