问题描述
在Java的并发编程中引用的监视器是什么?
当我读到每个对象都关联一个监视器
是否是一个特殊对象?
线程1:
b
public void a()
{
synchronized(someObject){
// do something(1)
}
}
主题2:
$ b b
public void b()
{
synchronized(someObject){
//做其他事情(2)
}
}
这可以防止线程1和线程2同时访问受监视。一个将开始,监视将阻止另一个在第一个完成之前访问该区域。
这不是一个特殊的对象。它是类层次结构根中的同步机制: java.lang.Object
。
还有 wait
和通知
方法也将使用对象的监视器在不同线程之间通信。
What's a monitor referred to in concurrent programming in Java?
When I read that "every object has associated a monitor" what does it meaning?
Is it a special object?
A monitor is mechanism to control concurrent access to an object.
This allows you to do:
Thread 1:
public void a()
{
synchronized(someObject) {
// do something (1)
}
}
Thread 2:
public void b()
{
synchronized(someObject) {
// do something else (2)
}
}
This prevents Threads 1 and 2 accessing the monitored (synchronized) section at the same time. One will start, and monitor will prevent the other from accessing the region before the first one finishes.
It's not a special object. It's synchronization mechanism placed at class hierarchy root: java.lang.Object
.
There are also wait
and notify
methods that will also use object's monitor to communication among different threads.
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