Java 仅当处于临界段时才中断另一个线程

我有一个在线程中运行的方法，我只希望该线程在给定的关键方法/节中被中断。如果中断，将从具有未定义行为的旧代码调用该方法

如何设置关键方法和中断器方法，使中断不会将代码留在遗留代码中

我尝试过使用睡眠和其他技术来减少比赛条件，但没有一种能完全消除它们

public class InterruptPlayground
{
   Thread _thread = null;

   /**
    * Implements some interface that legacy calls on "main" thread
    */
   void methodCalledFromLegacyCode()
   {
      try // critical section (probably wrong term)
      {
         _thread = Thread.currentThread();

         /**
          * Lots of fancy code goes here...
          *
          * If we are in here this section, we want the method below to be able to interrupt us, to inform us of its
          * impending death.
          */
      }
      finally
      {
         _thread = null; // part 1 of race
         if (Thread.interrupted()) // part 3 of race
         {
            // consume any interrupts in attempt to prevent race conditions, and prevent legacy code from getting interrupt
         }
      }
      /**
       * If the other thread interrupts us after this, the legacy code would encounter it, and how it deals with
       * interrupts is undefined (very legacy code, like 2000).
       */
   }

   /**
    * Called when one of our threads is about to die and we need to inform the above method
    */
   void methodThatNeedsToInterruptAboveMethod()
   {
      try
      {
         // if I did a null check, I could get a race condition, right?
         _thread.interrupt(); // part 2 of race
      }
      catch (NullPointerException ex)
      {
         // guess we were not in the critical section
      }
   }
}

这个代码不受比赛条件限制吗？ 从第二个方法调用的中断信号是否可能逃逸第一个方法（并到达遗留代码）？

---

我担心第1-3部分之间的竞争条件。

在java中，这不是处理竞争条件的方法。您应该使用诸如“synchronized”、互斥体、信号量等语言特性。当多个线程访问共享状态时，可能无法看到彼此对该状态的更改。我在这里看不到这些。如果在方法末尾处理一个中断并重置中断标志（Thread.interrupted（）），调用代码就不会知道它被中断了。就这么简单。除非我误解了你的目标。