Fri, 22 Oct 2010 15:59:34 -0400
6988353: refactor contended sync subsystem
Summary: reduce complexity by factoring synchronizer.cpp
Reviewed-by: dholmes, never, coleenp
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 */
25 class StatSamplerTask;
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 {
37 friend class StatSamplerTask;
39 private:
41 static StatSamplerTask* _task;
42 static PerfDataList* _sampled;
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);
51 public:
52 // Start/stop the sampler
53 static void engage();
54 static void disengage();
56 static bool is_active() { return _task != NULL; }
58 static void initialize();
59 static void destroy();
60 };
62 void statSampler_exit();