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正文
這里詳細分析interrupt(),interrupted(),isInterrupted()三個方法
interrupt()
中斷這個線程，設置中斷標識位
public void interrupt() {
if (this != Thread.currentThread())
checkAccess();
synchronized (blockerLock) {
Interruptible b = blocker;
if (b != null) {
interrupt0(); // Just to set the interrupt flag
b.interrupt(this);
return;
}
}
interrupt0();
}
我們來找下如何設置中斷標識位的
找到interrupt0()的源碼，src/hotspot/share/prims/jvm.cpp
JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
...
if (is_alive) {
// jthread refers to a live JavaThread.
Thread::interrupt(receiver);
}
JVM_END
調用了Thread::interrupt方法
src/hotspot/share/runtime/thread.cpp
void Thread::interrupt(Thread* thread) {
...
os::interrupt(thread);
}
os::interrupt方法，src/hotspot/os/posix/os_posix.cpp
void os::interrupt(Thread* thread) {
...
OSThread* osthread = thread->osthread();
if (!osthread->interrupted()) {
//設置中斷標識位
osthread->set_interrupted(true);
...
}
...
}
isInterrupted()
測試線程是否被中斷，線程的中斷狀態不會改變
public boolean isInterrupted() {
return isInterrupted(false);
}
查看native isInterrupted(boolean ClearInterrupted)源碼，查找方式同上
src/hotspot/os/posix/os_posix.cpp
bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
debug_only(Thread::check_for_dangling_thread_pointer(thread);)
OSThread* osthread = thread->osthread();
// 查看是否被中斷
bool interrupted = osthread->interrupted();
// 清除標識位后再設置false
if (interrupted && clear_interrupted) {
osthread->set_interrupted(false);
}
return interrupted;
}
Java傳遞ClearInterrupted為false，對應C++的clear_interrupted
interrupted()
測試線程是否被中斷，清除中斷標識位
public static boolean interrupted() {
return currentThread().isInterrupted(true);
}
簡單的例子
public class MyThread45 {
public static void main(String[] args) throws Exception
{
Runnable runnable = new Runnable()
{
public void run()
{
while (true)
{
if (Thread.currentThread().isInterrupted())
{
System.out.println("線程被中斷了");
return ;
}
else
{
System.out.println("線程沒有被中斷");
}
}
}
};
Thread t = new Thread(runnable);
t.start();
Thread.sleep(500);
t.interrupt();
System.out.println("線程中斷了，程序到這里了");
}
}
檢查線程是否中斷，中斷線程，運行結果如下
······ 線程沒有被中斷 線程沒有被中斷 線程沒有被中斷 線程被中斷了 線程中斷了，程序到這里了
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