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问题描述
我在我们的项目中遇到了以下代码:
I faced the following code in our project:
synchronized (Thread.currentThread()){
//some code
}
我不明白在 currentThread
上使用同步的原因.
I don't understand the reason to use synchronized on currentThread
.
有什么区别
synchronized (Thread.currentThread()){
//some code
}
只是
//some code
你能举个例子说明区别吗?
Can you provide an example which shows the difference?
更详细的这段代码如下:
more in details this code as follows:
synchronized (Thread.currentThread()) {
Thread.currentThread().wait(timeInterval);
}
看起来只是 Thread.sleep(timeInterval)
.是真的吗?
It looks like just Thread.sleep(timeInterval)
. Is it truth?
推荐答案
考虑一下
Thread t = new Thread() {
public void run() { // A
synchronized (Thread.currentThread()) {
System.out.println("A");
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
}
}
}
};
t.start();
synchronized (t) { // B
System.out.println("B");
Thread.sleep(5000);
}
块 A 和 B 不能同时运行,因此在给定的测试中,A"或B"输出将延迟 5 秒,哪个先出现是未定义的
blocks A and B cannot run simultaneously, so in the given test either "A" or "B" output will be delayed by 5 secs, which one will come first is undefined
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