diff --git a/src/hotspot/share/gc/z/zLock.cpp b/src/hotspot/share/gc/z/zLock.cpp
new file mode 100644
index 0000000..2997f3a
--- /dev/null
+++ b/src/hotspot/share/gc/z/zLock.cpp
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2018, 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.
+ */
+
+
+#include "precompiled.hpp"
+#include "gc/z/zLock.inline.hpp"
+
+void ZLock::lock() {
+  pthread_mutex_lock(&_lock);
+}
+
+bool ZLock::try_lock() {
+  return pthread_mutex_trylock(&_lock) == 0;
+}
+
+void ZLock::unlock() {
+  pthread_mutex_unlock(&_lock);
+}
+
+
+void ZReentrantLock::lock() {
+  ZLock::lock();
+  _owner = Thread::current();
+}
+
+bool ZReentrantLock::try_lock() {
+  if (!ZLock::try_lock()) {
+    return false;
+  }
+
+  _owner = Thread::current();
+  return true;
+}
+
+void ZReentrantLock::unlock() {
+  _owner = NULL;
+  ZLock::unlock();
+}