1 /*
   2  * Copyright (c) 2012, 2018, 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 #ifndef SHARE_VM_JFR_PERIODIC_SAMPLING_JFRTHREADSAMPLER_HPP
  26 #define SHARE_VM_JFR_PERIODIC_SAMPLING_JFRTHREADSAMPLER_HPP
  27 
  28 #include "jfr/utilities/jfrAllocation.hpp"
  29 
  30 class JavaThread;
  31 class JfrStackFrame;
  32 class JfrThreadSampler;
  33 class Thread;
  34 
  35 class JfrThreadSampling : public JfrCHeapObj {
  36   friend class JfrRecorder;
  37  private:
  38   JfrThreadSampler* _sampler;
  39   void start_sampler(size_t interval_java, size_t interval_native);
  40   void set_sampling_interval(bool java_interval, size_t period);
  41 
  42   JfrThreadSampling();
  43   ~JfrThreadSampling();
  44 
  45   static JfrThreadSampling& instance();
  46   static JfrThreadSampling* create();
  47   static void destroy();
  48 
  49  public:
  50   static void set_java_sample_interval(size_t period);
  51   static void set_native_sample_interval(size_t period);
  52   static void on_javathread_suspend(JavaThread* thread);
  53   static Thread* sampler_thread();
  54 };
  55 
  56 #endif // SHARE_VM_JFR_PERIODIC_SAMPLING_JFRTHREADSAMPLER_HPP