--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/shared/gcLocker.inline.hpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2000, 2015, 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.
+ *
+ * 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.
+ *
+ */
+
+#ifndef SHARE_VM_GC_SHARED_GCLOCKER_INLINE_HPP
+#define SHARE_VM_GC_SHARED_GCLOCKER_INLINE_HPP
+
+#include "gc/shared/gcLocker.hpp"
+
+inline void GCLocker::lock_critical(JavaThread* thread) {
+  if (!thread->in_critical()) {
+    if (needs_gc()) {
+      // jni_lock call calls enter_critical under the lock so that the
+      // global lock count and per thread count are in agreement.
+      jni_lock(thread);
+      return;
+    }
+    increment_debug_jni_lock_count();
+  }
+  thread->enter_critical();
+}
+
+inline void GCLocker::unlock_critical(JavaThread* thread) {
+  if (thread->in_last_critical()) {
+    if (needs_gc()) {
+      // jni_unlock call calls exit_critical under the lock so that
+      // the global lock count and per thread count are in agreement.
+      jni_unlock(thread);
+      return;
+    }
+    decrement_debug_jni_lock_count();
+  }
+  thread->exit_critical();
+}
+
+#endif // SHARE_VM_GC_SHARED_GCLOCKER_INLINE_HPP