--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/jfr/periodic/sampling/jfrThreadSampler.hpp	Tue May 15 20:24:34 2018 +0200
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2012, 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.
+ *
+ */
+
+#ifndef SHARE_VM_JFR_PERIODIC_SAMPLING_JFRTHREADSAMPLER_HPP
+#define SHARE_VM_JFR_PERIODIC_SAMPLING_JFRTHREADSAMPLER_HPP
+
+#include "jfr/utilities/jfrAllocation.hpp"
+
+class Monitor;
+class JavaThread;
+class JfrStackFrame;
+class JfrThreadSampler;
+class Thread;
+
+class JfrThreadSampling : public JfrCHeapObj {
+  friend class JfrRecorder;
+ private:
+  JfrThreadSampler* _sampler;
+  void start_sampler(size_t interval_java, size_t interval_native);
+  void set_sampling_interval(bool java_interval, size_t period);
+
+  JfrThreadSampling();
+  ~JfrThreadSampling();
+
+  static JfrThreadSampling& instance();
+  static JfrThreadSampling* create();
+  static void destroy();
+
+ public:
+  static void set_java_sample_interval(size_t period);
+  static void set_native_sample_interval(size_t period);
+  static void on_javathread_suspend(JavaThread* thread);
+  static Thread* sampler_thread();
+};
+
+#endif // SHARE_VM_JFR_PERIODIC_SAMPLING_JFRTHREADSAMPLER_HPP