--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/z/zMarkTerminate.inline.hpp	Tue Jun 12 17:40:28 2018 +0200
@@ -0,0 +1,87 @@
+/*
+ * 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.
+ */
+
+#ifndef SHARE_GC_Z_ZMARKTERMINATE_INLINE_HPP
+#define SHARE_GC_Z_ZMARKTERMINATE_INLINE_HPP
+
+#include "runtime/atomic.hpp"
+#include "runtime/orderAccess.hpp"
+
+inline ZMarkTerminate::ZMarkTerminate() :
+    _nworkers(0),
+    _nworking_stage0(0),
+    _nworking_stage1(0) {}
+
+inline bool ZMarkTerminate::enter_stage(volatile uint* nworking_stage) {
+  return Atomic::sub(1u, nworking_stage) == 0;
+}
+
+inline void ZMarkTerminate::exit_stage(volatile uint* nworking_stage) {
+  Atomic::add(1u, nworking_stage);
+}
+
+inline bool ZMarkTerminate::try_exit_stage(volatile uint* nworking_stage) {
+  uint nworking = Atomic::load(nworking_stage);
+
+  for (;;) {
+    if (nworking == 0) {
+      return false;
+    }
+
+    const uint new_nworking = nworking + 1;
+    const uint prev_nworking = Atomic::cmpxchg(new_nworking, nworking_stage, nworking);
+    if (prev_nworking == nworking) {
+      // Success
+      return true;
+    }
+
+    // Retry
+    nworking = prev_nworking;
+  }
+}
+
+inline void ZMarkTerminate::reset(uint nworkers) {
+  _nworkers = _nworking_stage0 = _nworking_stage1 = nworkers;
+}
+
+inline bool ZMarkTerminate::enter_stage0() {
+  return enter_stage(&_nworking_stage0);
+}
+
+inline void ZMarkTerminate::exit_stage0() {
+  exit_stage(&_nworking_stage0);
+}
+
+inline bool ZMarkTerminate::try_exit_stage0() {
+  return try_exit_stage(&_nworking_stage0);
+}
+
+inline bool ZMarkTerminate::enter_stage1() {
+  return enter_stage(&_nworking_stage1);
+}
+
+inline bool ZMarkTerminate::try_exit_stage1() {
+  return try_exit_stage(&_nworking_stage1);
+}
+
+#endif // SHARE_GC_Z_ZMARKTERMINATE_INLINE_HPP