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1 /*
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2 * Copyright 2001-2002 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 class StatSamplerTask;
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26
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27 /*
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28 * The StatSampler class is responsible for periodically updating
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29 * sampled PerfData instances and writing the sampled values to the
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30 * PerfData memory region.
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31 *
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32 * In addition it is also responsible for providing a home for
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33 * PerfData instances that otherwise have no better home.
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34 */
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35 class StatSampler : AllStatic {
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36
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37 friend class StatSamplerTask;
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38
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39 private:
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40
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41 static StatSamplerTask* _task;
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42 static PerfDataList* _sampled;
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43
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44 static void collect_sample();
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45 static void create_misc_perfdata();
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46 static void create_sampled_perfdata();
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47 static void sample_data(PerfDataList* list);
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48 static const char* get_system_property(const char* name, TRAPS);
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49 static void create_system_property_instrumentation(TRAPS);
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50
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51 public:
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52 // Start/stop the sampler
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53 static void engage();
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54 static void disengage();
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55
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56 static bool is_active() { return _task != NULL; }
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57
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58 static void initialize();
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59 static void destroy();
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60 };
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61
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62 void statSampler_exit();
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