Add JCL support for Java 8-17

Signed-off-by: Jack Lu <Jack.S.Lu@ibm.com>

Author: fengxue-IS

jcl/src/java.base/share/classes/java/lang/Thread.java

@@ -94,14 +94,15 @@ private static final class TidLock {
 	 */
 	private volatile boolean deadInterrupt;
 	/*[ENDIF] JAVA_SPEC_VERSION >= 14 */
-	private volatile boolean started;				// If !isAlive(), tells if Thread died already or hasn't even started
-	private String name;						// The Thread's name
-	private int priority = NORM_PRIORITY;			// The Thread's current priority
+	private volatile boolean started;		// If !isAlive(), tells if Thread died already or hasn't even started
+	private String name;					// The Thread's name
+	private int priority = NORM_PRIORITY;	// The Thread's current priority
 	private boolean isDaemon;				// Tells if the Thread is a daemon thread or not.
+	private volatile int threadStatus;      // The Thread's state.
 
-	ThreadGroup group;			// A Thread belongs to exactly one ThreadGroup
+	ThreadGroup group;						// A Thread belongs to exactly one ThreadGroup
 	private Runnable runnable;				// Target (optional) runnable object
-	private boolean stopCalled = false;			// Used by the VM
+	private boolean stopCalled = false;		// Used by the VM
 /*[PR 1FENTZW]*/
 	private ClassLoader contextClassLoader;	// Used to find classes and resources in this Thread
 	ThreadLocal.ThreadLocalMap threadLocals;
@@ -1488,6 +1489,39 @@ public static enum State {
 	 */
 	TERMINATED }
 
+/**
+ * Returns the translation from a J9VMThread state to a Thread::State.
+ *
+ * @param status thread status value set by VM.
+ * @return this thread's state.
+ *
+ * @see State
+ */
+private State translateJ9VMThreadStateToThreadState(int status) {
+	switch (status) {
+	case 1: // J9VMTHREAD_STATE_RUNNING
+		return State.RUNNABLE;
+	case 2: // J9VMTHREAD_STATE_BLOCKED
+		return State.BLOCKED;
+	case 4: // J9VMTHREAD_STATE_WAITING
+	case 0x80: // J9VMTHREAD_STATE_PARKED
+		return State.WAITING;
+	case 8: // J9VMTHREAD_STATE_SLEEPING
+	case 64: // J9VMTHREAD_STATE_WAITING_TIMED
+	case 0x100: // J9VMTHREAD_STATE_PARKED_TIMED
+		return State.TIMED_WAITING;
+	case 32: // J9VMTHREAD_STATE_DEAD
+		return State.TERMINATED;
+	default:
+		synchronized (lock) {
+			if (threadRef == NO_REF) {
+				return State.TERMINATED;
+			}
+			return State.values()[getStateImpl(threadRef)];
+		}
+	}
+}
+
 /**
  * Returns the current Thread state.
  *
@@ -1496,15 +1530,13 @@ public static enum State {
  * @see State
  */
 public State getState() {
-	synchronized(lock) {
+	if (started) {
 		if (threadRef == NO_REF) {
-			if (isDead()) {
-				return State.TERMINATED;
-			}
-			return State.NEW;
+			return State.TERMINATED;
 		}
-		return State.values()[getStateImpl(threadRef)];
+		return translateJ9VMThreadStateToThreadState(threadStatus);
 	}
+	return State.NEW;
 }
 
 private native int getStateImpl(long threadRef);