--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.instrument/share/native/libinstrument/Reentrancy.h	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2003, 2007, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * Copyright 2003 Wily Technology, Inc.
+ */
+
+#ifndef _REENTRANCY_H_
+#define _REENTRANCY_H_
+
+#include    <jni.h>
+
+/*
+ *  This module provides some utility functions to support the "same thread" re-entrancy management.
+ *  Uses JVMTI TLS to store a single bit per thread.
+ *  Non-zero means the thread is already inside; zero means the thread is not inside.
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* returns true if the token is acquired by this call,
+ * false if we already hold it and do not have to acquire it
+ */
+extern jboolean
+tryToAcquireReentrancyToken(    jvmtiEnv *  jvmtienv,
+                                jthread     thread);
+
+/* release the token; assumes we already hold it */
+extern void
+releaseReentrancyToken(         jvmtiEnv *  jvmtienv,
+                                jthread     thread);
+
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif /* __cplusplus */
+
+
+#endif