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_JFROSINTERFACE_HPP
  26 #define SHARE_VM_JFR_PERIODIC_JFROSINTERFACE_HPP
  27 
  28 #include "jfr/utilities/jfrAllocation.hpp"
  29 #include "utilities/globalDefinitions.hpp"
  30 
  31 class CPUInformation;
  32 class EnvironmentVariable;
  33 class SystemProcess;
  34 
  35 class JfrOSInterface: public JfrCHeapObj {
  36   friend class JfrRecorder;
  37  private:
  38   class JfrOSInterfaceImpl;
  39   JfrOSInterfaceImpl* _impl;
  40 
  41   JfrOSInterface();
  42   ~JfrOSInterface();
  43   bool initialize();
  44   static JfrOSInterface& instance();
  45   static JfrOSInterface* create();
  46   static void destroy();
  47 
  48  public:
  49   static int cpu_information(CPUInformation& cpu_info);
  50   static int cpu_load(int which_logical_cpu, double* cpu_load);
  51   static int context_switch_rate(double* rate);
  52   static int cpu_load_total_process(double* cpu_load);
  53   static int cpu_loads_process(double* pjvmUserLoad, double* pjvmKernelLoad, double* psystemTotalLoad);
  54   static int os_version(char** os_version);
  55   static int generate_initial_environment_variable_events();
  56   static int system_processes(SystemProcess** system_processes, int* no_of_sys_processes);
  57 };
  58 
  59 #endif // SHARE_VM_JFR_PERIODIC_JFROSINTERFACE_HPP