Java中有Mutex吗？ [英] Is there a Mutex in Java?

问题描述

有没有一个Mutex对象在java或者一种方式来创建一个？
我问，因为用1 permit初始化的Semaphore对象不能帮助我。
考虑这种情况：

Is there a Mutex object in java or a way to create one? I am asking because a Semaphore object initialized with 1 permit does not help me. Think of this case:

try {
   semaphore.acquire();
   //do stuff
   semaphore.release();
} catch (Exception e) {
   semaphore.release();
}

如果在第一次获取时发生异常，增加许可证，信号量不再是二进制信号量。

if an exception happens at the first acquire, the release in the catch block will increase the permits, and the semaphore is no longer a binary semaphore.

正确的方法是什么？

try {
   semaphore.acquire();
   //do stuff
} catch (Exception e) {
   //exception stuff
} finally {
   semaphore.release();
}

上述代码是否会确保信号量是二进制的？

Will the above code ensure that the semaphore will be binary?

推荐答案

查看此页面： http://www.oracle.com/technetwork/articles/javase/index-140767.html

它有一个稍微不同的模式， （我认为）你正在寻找：

It has a slightly different pattern which is (I think) what you are looking for:

try {
  mutex.acquire();
  try {
    // do something
  } finally {
    mutex.release();
  }
} catch(InterruptedException ie) {
  // ...
}

在这种用法中，只有在获取（） release（） $ c>

In this usage, you're only calling release() after a successful acquire()

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