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Thread.interrupted()

调用t.interrupt()后，第一次返回true, 第2次及之后都返回false

jdk源码

其实都是空方法

interrupted

public static boolean interrupted() {
       return currentThread().isInterrupted(true); // ClearInterrupted}

isInterrupted

private native boolean isInterrupted(boolean ClearInterrupted);

c++源码

JVM_IsInterrupted

JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))  JVMWrapper("JVM_IsInterrupted");  // Ensure that the C++ Thread and OSThread structures aren't freed before we operate  oop java_thread = JNIHandles::resolve_non_null(jthread);  MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);  // We need to re-resolve the java_thread, since a GC might have happened during the  // acquire of the lock  JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));  if (thr == NULL) {
       return JNI_FALSE;  } else {
       return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0);  }JVM_END

osThread.hpp

volatile jint _interrupted;     // Thread.isInterrupted statevoid set_interrupted(bool z)   {
    _interrupted = z ? 1 : 0; }volatile bool interrupted() const  {
    return _interrupted != 0; }

os_linux.cpp

bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
     assert(Thread::current() == thread || Threads_lock->owned_by_self(),    "possibility of dangling Thread pointer");  OSThread* osthread = thread->osthread();  bool interrupted = osthread->interrupted(); // 返回interrupted状态  if (interrupted && clear_interrupted) {
    // 现在是中断状态 并且clear_interrupted=true 才会进来    osthread->set_interrupted(false); //设置false    // consider thread->_SleepEvent->reset() ... optional optimization  }  return interrupted;}

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