aoqi@0: /*
aoqi@0:  * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: #ifndef SHARE_VM_RUNTIME_STATSAMPLER_HPP
aoqi@0: #define SHARE_VM_RUNTIME_STATSAMPLER_HPP
aoqi@0: 
aoqi@0: #include "runtime/perfData.hpp"
aoqi@0: #include "runtime/task.hpp"
aoqi@0: 
aoqi@0: class StatSamplerTask;
aoqi@0: 
aoqi@0: /*
aoqi@0:  * The StatSampler class is responsible for periodically updating
aoqi@0:  * sampled PerfData instances and writing the sampled values to the
aoqi@0:  * PerfData memory region.
aoqi@0:  *
aoqi@0:  * In addition it is also responsible for providing a home for
aoqi@0:  * PerfData instances that otherwise have no better home.
aoqi@0:  */
aoqi@0: class StatSampler : AllStatic {
aoqi@0: 
aoqi@0:   friend class StatSamplerTask;
aoqi@0: 
aoqi@0:   private:
aoqi@0: 
aoqi@0:     static StatSamplerTask* _task;
aoqi@0:     static PerfDataList* _sampled;
aoqi@0: 
aoqi@0:     static void collect_sample();
aoqi@0:     static void create_misc_perfdata();
aoqi@0:     static void create_sampled_perfdata();
aoqi@0:     static void sample_data(PerfDataList* list);
aoqi@0:     static const char* get_system_property(const char* name, TRAPS);
aoqi@0:     static void create_system_property_instrumentation(TRAPS);
aoqi@0: 
aoqi@0:   public:
aoqi@0:     // Start/stop the sampler
aoqi@0:     static void engage();
aoqi@0:     static void disengage();
aoqi@0: 
aoqi@0:     static bool is_active() { return _task != NULL; }
aoqi@0: 
aoqi@0:     static void initialize();
aoqi@0:     static void destroy();
aoqi@0: };
aoqi@0: 
aoqi@0: void statSampler_exit();
aoqi@0: 
aoqi@0: #endif // SHARE_VM_RUNTIME_STATSAMPLER_HPP