duke@435: /*
stefank@2314:  * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
stefank@2314: #ifndef SHARE_VM_RUNTIME_STATSAMPLER_HPP
stefank@2314: #define SHARE_VM_RUNTIME_STATSAMPLER_HPP
stefank@2314: 
stefank@2314: #include "runtime/perfData.hpp"
stefank@2314: #include "runtime/task.hpp"
stefank@2314: 
duke@435: class StatSamplerTask;
duke@435: 
duke@435: /*
duke@435:  * The StatSampler class is responsible for periodically updating
duke@435:  * sampled PerfData instances and writing the sampled values to the
duke@435:  * PerfData memory region.
duke@435:  *
duke@435:  * In addition it is also responsible for providing a home for
duke@435:  * PerfData instances that otherwise have no better home.
duke@435:  */
duke@435: class StatSampler : AllStatic {
duke@435: 
duke@435:   friend class StatSamplerTask;
duke@435: 
duke@435:   private:
duke@435: 
duke@435:     static StatSamplerTask* _task;
duke@435:     static PerfDataList* _sampled;
duke@435: 
duke@435:     static void collect_sample();
duke@435:     static void create_misc_perfdata();
duke@435:     static void create_sampled_perfdata();
duke@435:     static void sample_data(PerfDataList* list);
duke@435:     static const char* get_system_property(const char* name, TRAPS);
duke@435:     static void create_system_property_instrumentation(TRAPS);
duke@435: 
duke@435:   public:
duke@435:     // Start/stop the sampler
duke@435:     static void engage();
duke@435:     static void disengage();
duke@435: 
duke@435:     static bool is_active() { return _task != NULL; }
duke@435: 
duke@435:     static void initialize();
duke@435:     static void destroy();
duke@435: };
duke@435: 
duke@435: void statSampler_exit();
stefank@2314: 
stefank@2314: #endif // SHARE_VM_RUNTIME_STATSAMPLER_HPP