Thread.interrupt()源码跟踪
1 JDK源码跟踪
// java.lang.Thread
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();
}
private native void interrupt0();
2 OpenJDK源码跟踪
- jdk源码(JNI注册)
// jdk/src/share/native/java/lang/Thread.c:43
static JNINativeMethod methods[] = {
{"start0", "()V", (void *)&JVM_StartThread},
{"stop0", "(" OBJ ")V", (void *)&JVM_StopThread},
{"isAlive", "()Z", (void *)&JVM_IsThreadAlive},
{"suspend0", "()V", (void *)&JVM_SuspendThread},
{"resume0", "()V", (void *)&JVM_ResumeThread},
{"setPriority0", "(I)V", (void *)&JVM_SetThreadPriority},
{"yield", "()V", (void *)&JVM_Yield},
{"sleep", "(J)V", (void *)&JVM_Sleep},
{"currentThread", "()" THD, (void *)&JVM_CurrentThread},
{"countStackFrames", "()I", (void *)&JVM_CountStackFrames},
{"interrupt0", "()V", (void *)&JVM_Interrupt},
{"isInterrupted", "(Z)Z", (void *)&JVM_IsInterrupted},
{"holdsLock", "(" OBJ ")Z", (void *)&JVM_HoldsLock},
{"getThreads", "()[" THD, (void *)&JVM_GetAllThreads},
{"dumpThreads", "([" THD ")[[" STE, (void *)&JVM_DumpThreads},
{"setNativeName", "(" STR ")V", (void *)&JVM_SetNativeThreadName},
};
// jdk/src/share/javavm/export/jvm.h:254
JNIEXPORT void JNICALL
JVM_Interrupt(JNIEnv *env, jobject thread);
- java虚拟机(HotSpot实现):
// hotspot/src/share/prims/jvm.cpp:3289
JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
JVMWrapper("JVM_Interrupt");
// 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) {
Thread::interrupt(thr);
}
JVM_END
// hotspot/src/share/vm/runtime/thraed.cpp:634
ParkEvent * _ParkEvent ; // for synchronized()
ParkEvent * _SleepEvent ; // for Thread.sleep
ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor,互斥锁
ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease,共享锁
// hotspot/src/share/vm/runtime/thraed.cpp:804
void Thread::interrupt(Thread* thread) {
trace("interrupt", thread);
debug_only(check_for_dangling_thread_pointer(thread);)
os::interrupt(thread);
}
// hotspot/src/hotspot/os/linux/vm/os_linux.cpp:4192
void os::interrupt(Thread* thread) {
assert(Thread::current() == thread || Threads_lock->owned_by_self(),
"possibility of dangling Thread pointer");
OSThread* osthread = thread->osthread();
if (!osthread->interrupted()) {
osthread->set_interrupted(true);
// More than one thread can get here with the same value of osthread,
// resulting in multiple notifications. We do, however, want the store
// to interrupted() to be visible to other threads before we execute unpark().
OrderAccess::fence();
ParkEvent * const slp = thread->_SleepEvent ;
// Thread.sleep方法继续运行
if (slp != NULL) slp->unpark() ;
}
// For JSR166. Unpark event if interrupt status already was set
if (thread->is_Java_thread())
((JavaThread*)thread)->parker()->unpark();
ParkEvent * ev = thread->_ParkEvent ;
if (ev != NULL) ev->unpark() ;
}
// hotspot/src/share/vm/runtime/osThread.hpp:很短自己看
volatile jint _interrupted; // Thread.isInterrupted state
volatile bool interrupted() const{
return _interrupted != 0;
}
void set_interrupted(bool z){
_interrupted = z ? 1 : 0;
}
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