--- /dev/null	2018-04-03 12:55:20.301839954 +0200
+++ new/src/hotspot/share/gc/z/zTask.cpp	2018-06-06 00:42:24.847037110 +0200
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2017, 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/zTask.hpp"
+#include "gc/z/zThread.hpp"
+
+ZTask::GangTask::GangTask(ZTask* ztask, const char* name) :
+    AbstractGangTask(name),
+    _ztask(ztask) {}
+
+void ZTask::GangTask::work(uint worker_id) {
+  ZThread::set_worker_id(worker_id);
+  _ztask->work();
+  ZThread::clear_worker_id();
+}
+
+ZTask::ZTask(const char* name) :
+    _gang_task(this, name) {}
+
+const char* ZTask::name() const {
+  return _gang_task.name();
+}
+
+AbstractGangTask* ZTask::gang_task() {
+  return &_gang_task;
+}