Merge pull request #5778 from JasonFengJ9/classcache

Add a VMLangAccess method to create threads

jcl/src/java.base/share/classes/com/ibm/oti/vm/VMLangAccess.java

@@ -11,7 +11,7 @@
 
 
 /*******************************************************************************
- * Copyright (c) 2012, 2018 IBM Corp. and others
+ * Copyright (c) 2012, 2019 IBM Corp. and others
  *
  * This program and the accompanying materials are made available under
  * the terms of the Eclipse Public License 2.0 which accompanies this
@@ -155,4 +155,18 @@ public interface VMLangAccess {
 	public void addPackageToList(Class<?> newClass, ClassLoader loader);
 	/*[ENDIF] Sidecar19-SE */
 
+	/**
+	 * Create a thread that it has runnable as its run object, has threadName as its name, has contextClassLoader as its context ClassLoader,
+	 * has an option to be part of system thread group, has an option to inherit ThreadLocals or not, and has an option to set isDaemon.
+	 * 
+	 * @param       runnable                A java.lang.Runnable whose method <code>run</code> will be executed by the new Thread
+	 * @param       threadName              Name for the Thread being created
+	 * @param       isSystemThreadGroup     A boolean indicating whether the thread to be created belongs to the system thread group
+	 * @param       inheritThreadLocals     A boolean indicating whether to inherit initial values for inheritable thread-local variables
+	 * @param       isDaemon                Indicates whether or not the Thread being created is a daemon thread
+	 * @param       contextClassLoader      The context ClassLoader
+	 * 
+	 * @return      A java.lang.Thread created
+	 */
+	public Thread createThread(Runnable runnable, String threadName, boolean isSystemThreadGroup, boolean inheritThreadLocals, boolean isDaemon, ClassLoader contextClassLoader);
 }

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

@@ -349,6 +349,12 @@ public Thread(ThreadGroup group, Runnable runnable, String threadName) {
 	this(group, runnable, threadName, null, true);
 }
 
+Thread(Runnable runnable, String threadName, boolean isSystemThreadGroup, boolean inheritThreadLocals, boolean isDaemon, ClassLoader contextClassLoader) {
+	this(isSystemThreadGroup ? systemThreadGroup : null, runnable, threadName, null, inheritThreadLocals);
+	this.isDaemon = isDaemon;
+	this.contextClassLoader = contextClassLoader;
+}
+
 private Thread(ThreadGroup group, Runnable runnable, String threadName, AccessControlContext acc, boolean inheritThreadLocals) {
 	super();
 	/*[PR 1FEVFSU] Re-arrange method so that common code to this constructor and the private one the VM calls can be put in a separate method */

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

@@ -2,7 +2,7 @@
 package java.lang;
 
 /*******************************************************************************
- * Copyright (c) 2012, 2018 IBM Corp. and others
+ * Copyright (c) 2012, 2019 IBM Corp. and others
  *
  * This program and the accompanying materials are made available under
  * the terms of the Eclipse Public License 2.0 which accompanies this
@@ -216,4 +216,8 @@ public void addPackageToList(java.lang.Class<?> newClass, ClassLoader loader) {
 	}
 	/*[ENDIF] Sidecar19-SE */
 
+	@Override
+	public Thread createThread(Runnable runnable, String threadName, boolean isSystemThreadGroup, boolean inheritThreadLocals, boolean isDaemon, ClassLoader contextClassLoader) {
+		return new Thread(runnable, threadName, isSystemThreadGroup, inheritThreadLocals, isDaemon, contextClassLoader);
+	}
 }