1 /* 2 * Copyright (c) 2001, 2002, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 class StatSamplerTask; 26 27 /* 28 * The StatSampler class is responsible for periodically updating 29 * sampled PerfData instances and writing the sampled values to the 30 * PerfData memory region. 31 * 32 * In addition it is also responsible for providing a home for 33 * PerfData instances that otherwise have no better home. 34 */ 35 class StatSampler : AllStatic { 36 37 friend class StatSamplerTask; 38 39 private: 40 41 static StatSamplerTask* _task; 42 static PerfDataList* _sampled; 43 44 static void collect_sample(); 45 static void create_misc_perfdata(); 46 static void create_sampled_perfdata(); 47 static void sample_data(PerfDataList* list); 48 static const char* get_system_property(const char* name, TRAPS); 49 static void create_system_property_instrumentation(TRAPS); 50 51 public: 52 // Start/stop the sampler 53 static void engage(); 54 static void disengage(); 55 56 static bool is_active() { return _task != NULL; } 57 58 static void initialize(); 59 static void destroy(); 60 }; 61 62 void statSampler_exit();