--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/runtime/statSampler.hpp	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,62 @@
+/*
+ * Copyright 2001-2002 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+class StatSamplerTask;
+
+/*
+ * The StatSampler class is responsible for periodically updating
+ * sampled PerfData instances and writing the sampled values to the
+ * PerfData memory region.
+ *
+ * In addition it is also responsible for providing a home for
+ * PerfData instances that otherwise have no better home.
+ */
+class StatSampler : AllStatic {
+
+  friend class StatSamplerTask;
+
+  private:
+
+    static StatSamplerTask* _task;
+    static PerfDataList* _sampled;
+
+    static void collect_sample();
+    static void create_misc_perfdata();
+    static void create_sampled_perfdata();
+    static void sample_data(PerfDataList* list);
+    static const char* get_system_property(const char* name, TRAPS);
+    static void create_system_property_instrumentation(TRAPS);
+
+  public:
+    // Start/stop the sampler
+    static void engage();
+    static void disengage();
+
+    static bool is_active() { return _task != NULL; }
+
+    static void initialize();
+    static void destroy();
+};
+
+void statSampler_exit();