diff -r f5662bdbee4a -r d8e211419aaf src/hotspot/share/gc/z/zThread.inline.hpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/z/zThread.inline.hpp	Mon Oct 21 09:56:58 2019 +0200
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2015, 2019, 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_GC_Z_ZTHREAD_INLINE_HPP
+#define SHARE_GC_Z_ZTHREAD_INLINE_HPP
+
+#include "gc/z/zThread.hpp"
+#include "utilities/debug.hpp"
+
+inline void ZThread::ensure_initialized() {
+  if (!_initialized) {
+    initialize();
+  }
+}
+
+inline uintptr_t ZThread::id() {
+  ensure_initialized();
+  return _id;
+}
+
+inline bool ZThread::is_vm() {
+  ensure_initialized();
+  return _is_vm;
+}
+
+inline bool ZThread::is_java() {
+  ensure_initialized();
+  return _is_java;
+}
+
+inline bool ZThread::is_worker() {
+  ensure_initialized();
+  return _is_worker;
+}
+
+inline bool ZThread::is_runtime_worker() {
+  ensure_initialized();
+  return _is_runtime_worker;
+}
+
+inline uint ZThread::worker_id() {
+  assert(has_worker_id(), "Worker id not initialized");
+  return _worker_id;
+}
+
+#endif // SHARE_GC_Z_ZTHREAD_INLINE_HPP