src/hotspot/os/bsd/os_perf_bsd.cpp - platform/libcore - Git at Google

 /*
  * Copyright (c) 2012, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #include "memory/allocation.inline.hpp"
 #include "memory/resourceArea.hpp"
 #include "runtime/os.hpp"
 #include "runtime/os_perf.hpp"
 #include "vm_version_ext_x86.hpp"

 #ifdef __APPLE__
   #import <libproc.h>
   #include <sys/time.h>
   #include <sys/sysctl.h>
   #include <mach/mach.h>
   #include <mach/task_info.h>
 #endif

 static const double NANOS_PER_SEC = 1000000000.0;

 class CPUPerformanceInterface::CPUPerformance : public CHeapObj<mtInternal> {
    friend class CPUPerformanceInterface;
  private:
   long _total_cpu_nanos;
   long _total_csr_nanos;
   long _jvm_user_nanos;
   long _jvm_system_nanos;
   long _jvm_context_switches;
   long _used_ticks;
   long _total_ticks;
   int  _active_processor_count;

   bool now_in_nanos(long* resultp) {
     timeval current_time;
     if (gettimeofday(&current_time, NULL) != 0) {
       // Error getting current time
       return false;
     }
     *resultp = current_time.tv_sec * NANOS_PER_SEC + 1000L * current_time.tv_usec;
     return true;
   }

   double normalize(double value) {
     return MIN2<double>(MAX2<double>(value, 0.0), 1.0);
   }
   int cpu_load(int which_logical_cpu, double* cpu_load);
   int context_switch_rate(double* rate);
   int cpu_load_total_process(double* cpu_load);
   int cpu_loads_process(double* pjvmUserLoad, double* pjvmKernelLoad, double* psystemTotalLoad);

   CPUPerformance(const CPUPerformance& rhs); // no impl
   CPUPerformance& operator=(const CPUPerformance& rhs); // no impl
  public:
   CPUPerformance();
   bool initialize();
   ~CPUPerformance();
 };

 CPUPerformanceInterface::CPUPerformance::CPUPerformance() {
   _total_cpu_nanos= 0;
   _total_csr_nanos= 0;
   _jvm_context_switches = 0;
   _jvm_user_nanos = 0;
   _jvm_system_nanos = 0;
   _used_ticks = 0;
   _total_ticks = 0;
   _active_processor_count = 0;
 }

 bool CPUPerformanceInterface::CPUPerformance::initialize() {
   return true;
 }

 CPUPerformanceInterface::CPUPerformance::~CPUPerformance() {
 }

 int CPUPerformanceInterface::CPUPerformance::cpu_load(int which_logical_cpu, double* cpu_load) {
   return FUNCTIONALITY_NOT_IMPLEMENTED;
 }

 int CPUPerformanceInterface::CPUPerformance::cpu_load_total_process(double* cpu_load) {
 #ifdef __APPLE__
   host_name_port_t host = mach_host_self();
   host_flavor_t flavor = HOST_CPU_LOAD_INFO;
   mach_msg_type_number_t host_info_count = HOST_CPU_LOAD_INFO_COUNT;
   host_cpu_load_info_data_t cpu_load_info;

   kern_return_t kr = host_statistics(host, flavor, (host_info_t)&cpu_load_info, &host_info_count);
   if (kr != KERN_SUCCESS) {
     return OS_ERR;
   }

   long used_ticks  = cpu_load_info.cpu_ticks[CPU_STATE_USER] + cpu_load_info.cpu_ticks[CPU_STATE_NICE] + cpu_load_info.cpu_ticks[CPU_STATE_SYSTEM];
   long total_ticks = used_ticks + cpu_load_info.cpu_ticks[CPU_STATE_IDLE];

   if (_used_ticks == 0 || _total_ticks == 0) {
     // First call, just set the values
     _used_ticks  = used_ticks;
     _total_ticks = total_ticks;
     return OS_ERR;
   }

   long used_delta  = used_ticks - _used_ticks;
   long total_delta = total_ticks - _total_ticks;

   _used_ticks  = used_ticks;
   _total_ticks = total_ticks;

   if (total_delta == 0) {
     // Avoid division by zero
     return OS_ERR;
   }

   *cpu_load = (double)used_delta / total_delta;

   return OS_OK;
 #else
   return FUNCTIONALITY_NOT_IMPLEMENTED;
 #endif
 }

 int CPUPerformanceInterface::CPUPerformance::cpu_loads_process(double* pjvmUserLoad, double* pjvmKernelLoad, double* psystemTotalLoad) {
 #ifdef __APPLE__
   int result = cpu_load_total_process(psystemTotalLoad);
   mach_port_t task = mach_task_self();
   mach_msg_type_number_t task_info_count = TASK_INFO_MAX;
   task_info_data_t task_info_data;
   kern_return_t kr = task_info(task, TASK_ABSOLUTETIME_INFO, (task_info_t)task_info_data, &task_info_count);
   if (kr != KERN_SUCCESS) {
     return OS_ERR;
   }
   task_absolutetime_info_t absolutetime_info = (task_absolutetime_info_t)task_info_data;

   int active_processor_count = os::active_processor_count();
   long jvm_user_nanos = absolutetime_info->total_user;
   long jvm_system_nanos = absolutetime_info->total_system;

   long total_cpu_nanos;
   if(!now_in_nanos(&total_cpu_nanos)) {
     return OS_ERR;
   }

   if (_total_cpu_nanos == 0 || active_processor_count != _active_processor_count) {
     // First call or change in active processor count
     result = OS_ERR;
   }

   long delta_nanos = active_processor_count * (total_cpu_nanos - _total_cpu_nanos);
   if (delta_nanos == 0) {
     // Avoid division by zero
     return OS_ERR;
   }

   *pjvmUserLoad = normalize((double)(jvm_user_nanos - _jvm_user_nanos)/delta_nanos);
   *pjvmKernelLoad = normalize((double)(jvm_system_nanos - _jvm_system_nanos)/delta_nanos);

   _active_processor_count = active_processor_count;
   _total_cpu_nanos = total_cpu_nanos;
   _jvm_user_nanos = jvm_user_nanos;
   _jvm_system_nanos = jvm_system_nanos;

   return result;
 #else
   return FUNCTIONALITY_NOT_IMPLEMENTED;
 #endif
 }

 int CPUPerformanceInterface::CPUPerformance::context_switch_rate(double* rate) {
 #ifdef __APPLE__
   mach_port_t task = mach_task_self();
   mach_msg_type_number_t task_info_count = TASK_INFO_MAX;
   task_info_data_t task_info_data;
   kern_return_t kr = task_info(task, TASK_EVENTS_INFO, (task_info_t)task_info_data, &task_info_count);
   if (kr != KERN_SUCCESS) {
     return OS_ERR;
   }

   int result = OS_OK;
   if (_total_csr_nanos == 0 || _jvm_context_switches == 0) {
     // First call just set initial values.
     result = OS_ERR;
   }

   long jvm_context_switches = ((task_events_info_t)task_info_data)->csw;

   long total_csr_nanos;
   if(!now_in_nanos(&total_csr_nanos)) {
     return OS_ERR;
   }
   double delta_in_sec = (double)(total_csr_nanos - _total_csr_nanos) / NANOS_PER_SEC;
   if (delta_in_sec == 0.0) {
     // Avoid division by zero
     return OS_ERR;
   }

   *rate = (jvm_context_switches - _jvm_context_switches) / delta_in_sec;

   _jvm_context_switches = jvm_context_switches;
   _total_csr_nanos = total_csr_nanos;

   return result;
 #else
   return FUNCTIONALITY_NOT_IMPLEMENTED;
 #endif
 }

 CPUPerformanceInterface::CPUPerformanceInterface() {
   _impl = NULL;
 }

 bool CPUPerformanceInterface::initialize() {
   _impl = new CPUPerformanceInterface::CPUPerformance();
   return _impl != NULL && _impl->initialize();
 }

 CPUPerformanceInterface::~CPUPerformanceInterface() {
   if (_impl != NULL) {
     delete _impl;
   }
 }

 int CPUPerformanceInterface::cpu_load(int which_logical_cpu, double* cpu_load) const {
   return _impl->cpu_load(which_logical_cpu, cpu_load);
 }

 int CPUPerformanceInterface::cpu_load_total_process(double* cpu_load) const {
   return _impl->cpu_load_total_process(cpu_load);
 }

 int CPUPerformanceInterface::cpu_loads_process(double* pjvmUserLoad, double* pjvmKernelLoad, double* psystemTotalLoad) const {
   return _impl->cpu_loads_process(pjvmUserLoad, pjvmKernelLoad, psystemTotalLoad);
 }

 int CPUPerformanceInterface::context_switch_rate(double* rate) const {
   return _impl->context_switch_rate(rate);
 }

 class SystemProcessInterface::SystemProcesses : public CHeapObj<mtInternal> {
   friend class SystemProcessInterface;
  private:
   SystemProcesses();
   bool initialize();
   SystemProcesses(const SystemProcesses& rhs); // no impl
   SystemProcesses& operator=(const SystemProcesses& rhs); // no impl
   ~SystemProcesses();

   //information about system processes
   int system_processes(SystemProcess** system_processes, int* no_of_sys_processes) const;
 };

 SystemProcessInterface::SystemProcesses::SystemProcesses() {
 }

 bool SystemProcessInterface::SystemProcesses::initialize() {
   return true;
 }

 SystemProcessInterface::SystemProcesses::~SystemProcesses() {
 }
 int SystemProcessInterface::SystemProcesses::system_processes(SystemProcess** system_processes, int* no_of_sys_processes) const {
   assert(system_processes != NULL, "system_processes pointer is NULL!");
   assert(no_of_sys_processes != NULL, "system_processes counter pointer is NULL!");
 #ifdef __APPLE__
   pid_t* pids = NULL;
   int pid_count = 0;
   ResourceMark rm;

   int try_count = 0;
   while (pids == NULL) {
     // Find out buffer size
     size_t pids_bytes = proc_listpids(PROC_ALL_PIDS, 0, NULL, 0);
     if (pids_bytes <= 0) {
       return OS_ERR;
     }
     pid_count = pids_bytes / sizeof(pid_t);
     pids = NEW_RESOURCE_ARRAY(pid_t, pid_count);
     memset(pids, 0, pids_bytes);

     pids_bytes = proc_listpids(PROC_ALL_PIDS, 0, pids, pids_bytes);
     if (pids_bytes <= 0) {
        // couldn't fit buffer, retry.
       FREE_RESOURCE_ARRAY(pid_t, pids, pid_count);
       pids = NULL;
       try_count++;
       if (try_count > 3) {
       return OS_ERR;
       }
     } else {
       pid_count = pids_bytes / sizeof(pid_t);
     }
   }

   int process_count = 0;
   SystemProcess* next = NULL;
   for (int i = 0; i < pid_count; i++) {
     pid_t pid = pids[i];
     if (pid != 0) {
       char buffer[PROC_PIDPATHINFO_MAXSIZE];
       memset(buffer, 0 , sizeof(buffer));
       if (proc_pidpath(pid, buffer, sizeof(buffer)) != -1) {
         int length = strlen(buffer);
         if (length > 0) {
           SystemProcess* current = new SystemProcess();
           char * path = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
           strcpy(path, buffer);
           current->set_path(path);
           current->set_pid((int)pid);
           current->set_next(next);
           next = current;
           process_count++;
         }
       }
     }
   }

   *no_of_sys_processes = process_count;
   *system_processes = next;

   return OS_OK;
 #endif
   return FUNCTIONALITY_NOT_IMPLEMENTED;
 }

 int SystemProcessInterface::system_processes(SystemProcess** system_procs, int* no_of_sys_processes) const {
   return _impl->system_processes(system_procs, no_of_sys_processes);
 }

 SystemProcessInterface::SystemProcessInterface() {
   _impl = NULL;
 }

 bool SystemProcessInterface::initialize() {
   _impl = new SystemProcessInterface::SystemProcesses();
   return _impl != NULL && _impl->initialize();
 }

 SystemProcessInterface::~SystemProcessInterface() {
   if (_impl != NULL) {
     delete _impl;
  }
 }

 CPUInformationInterface::CPUInformationInterface() {
   _cpu_info = NULL;
 }

 bool CPUInformationInterface::initialize() {
   _cpu_info = new CPUInformation();

   if (NULL == _cpu_info) {
     return false;
   }
   _cpu_info->set_number_of_hardware_threads(VM_Version_Ext::number_of_threads());
   _cpu_info->set_number_of_cores(VM_Version_Ext::number_of_cores());
   _cpu_info->set_number_of_sockets(VM_Version_Ext::number_of_sockets());
   _cpu_info->set_cpu_name(VM_Version_Ext::cpu_name());
   _cpu_info->set_cpu_description(VM_Version_Ext::cpu_description());

   return true;
 }

 CPUInformationInterface::~CPUInformationInterface() {
   if (_cpu_info != NULL) {
     if (_cpu_info->cpu_name() != NULL) {
       const char* cpu_name = _cpu_info->cpu_name();
       FREE_C_HEAP_ARRAY(char, cpu_name);
       _cpu_info->set_cpu_name(NULL);
     }
     if (_cpu_info->cpu_description() != NULL) {
       const char* cpu_desc = _cpu_info->cpu_description();
       FREE_C_HEAP_ARRAY(char, cpu_desc);
       _cpu_info->set_cpu_description(NULL);
     }
     delete _cpu_info;
   }
 }

 int CPUInformationInterface::cpu_information(CPUInformation& cpu_info) {
   if (NULL == _cpu_info) {
     return OS_ERR;
   }

   cpu_info = *_cpu_info; // shallow copy assignment
   return OS_OK;
 }
	/*
	* Copyright (c) 2012, 2018, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*
	*/
	#include "precompiled.hpp"
	#include "memory/allocation.inline.hpp"
	#include "memory/resourceArea.hpp"
	#include "runtime/os.hpp"
	#include "runtime/os_perf.hpp"
	#include "vm_version_ext_x86.hpp"

	#ifdef __APPLE__
	#import <libproc.h>
	#include <sys/time.h>
	#include <sys/sysctl.h>
	#include <mach/mach.h>
	#include <mach/task_info.h>
	#endif

	static const double NANOS_PER_SEC = 1000000000.0;

	class CPUPerformanceInterface::CPUPerformance : public CHeapObj<mtInternal> {
	friend class CPUPerformanceInterface;
	private:
	long _total_cpu_nanos;
	long _total_csr_nanos;
	long _jvm_user_nanos;
	long _jvm_system_nanos;
	long _jvm_context_switches;
	long _used_ticks;
	long _total_ticks;
	int _active_processor_count;

	bool now_in_nanos(long* resultp) {
	timeval current_time;
	if (gettimeofday(&current_time, NULL) != 0) {
	// Error getting current time
	return false;
	}
	resultp = current_time.tv_sec NANOS_PER_SEC + 1000L * current_time.tv_usec;
	return true;
	}

	double normalize(double value) {
	return MIN2<double>(MAX2<double>(value, 0.0), 1.0);
	}
	int cpu_load(int which_logical_cpu, double* cpu_load);
	int context_switch_rate(double* rate);
	int cpu_load_total_process(double* cpu_load);
	int cpu_loads_process(double* pjvmUserLoad, double* pjvmKernelLoad, double* psystemTotalLoad);

	CPUPerformance(const CPUPerformance& rhs); // no impl
	CPUPerformance& operator=(const CPUPerformance& rhs); // no impl
	public:
	CPUPerformance();
	bool initialize();
	~CPUPerformance();
	};

	CPUPerformanceInterface::CPUPerformance::CPUPerformance() {
	_total_cpu_nanos= 0;
	_total_csr_nanos= 0;
	_jvm_context_switches = 0;
	_jvm_user_nanos = 0;
	_jvm_system_nanos = 0;
	_used_ticks = 0;
	_total_ticks = 0;
	_active_processor_count = 0;
	}

	bool CPUPerformanceInterface::CPUPerformance::initialize() {
	return true;
	}

	CPUPerformanceInterface::CPUPerformance::~CPUPerformance() {
	}

	int CPUPerformanceInterface::CPUPerformance::cpu_load(int which_logical_cpu, double* cpu_load) {
	return FUNCTIONALITY_NOT_IMPLEMENTED;
	}

	int CPUPerformanceInterface::CPUPerformance::cpu_load_total_process(double* cpu_load) {
	#ifdef __APPLE__
	host_name_port_t host = mach_host_self();
	host_flavor_t flavor = HOST_CPU_LOAD_INFO;
	mach_msg_type_number_t host_info_count = HOST_CPU_LOAD_INFO_COUNT;
	host_cpu_load_info_data_t cpu_load_info;

	kern_return_t kr = host_statistics(host, flavor, (host_info_t)&cpu_load_info, &host_info_count);
	if (kr != KERN_SUCCESS) {
	return OS_ERR;
	}

	long used_ticks = cpu_load_info.cpu_ticks[CPU_STATE_USER] + cpu_load_info.cpu_ticks[CPU_STATE_NICE] + cpu_load_info.cpu_ticks[CPU_STATE_SYSTEM];
	long total_ticks = used_ticks + cpu_load_info.cpu_ticks[CPU_STATE_IDLE];

	if (_used_ticks == 0 \|\| _total_ticks == 0) {
	// First call, just set the values
	_used_ticks = used_ticks;
	_total_ticks = total_ticks;
	return OS_ERR;
	}

	long used_delta = used_ticks - _used_ticks;
	long total_delta = total_ticks - _total_ticks;

	_used_ticks = used_ticks;
	_total_ticks = total_ticks;

	if (total_delta == 0) {
	// Avoid division by zero
	return OS_ERR;
	}

	*cpu_load = (double)used_delta / total_delta;

	return OS_OK;
	#else
	return FUNCTIONALITY_NOT_IMPLEMENTED;
	#endif
	}

	int CPUPerformanceInterface::CPUPerformance::cpu_loads_process(double* pjvmUserLoad, double* pjvmKernelLoad, double* psystemTotalLoad) {
	#ifdef __APPLE__
	int result = cpu_load_total_process(psystemTotalLoad);
	mach_port_t task = mach_task_self();
	mach_msg_type_number_t task_info_count = TASK_INFO_MAX;
	task_info_data_t task_info_data;
	kern_return_t kr = task_info(task, TASK_ABSOLUTETIME_INFO, (task_info_t)task_info_data, &task_info_count);
	if (kr != KERN_SUCCESS) {
	return OS_ERR;
	}
	task_absolutetime_info_t absolutetime_info = (task_absolutetime_info_t)task_info_data;

	int active_processor_count = os::active_processor_count();
	long jvm_user_nanos = absolutetime_info->total_user;
	long jvm_system_nanos = absolutetime_info->total_system;

	long total_cpu_nanos;
	if(!now_in_nanos(&total_cpu_nanos)) {
	return OS_ERR;
	}

	if (_total_cpu_nanos == 0 \|\| active_processor_count != _active_processor_count) {
	// First call or change in active processor count
	result = OS_ERR;
	}

	long delta_nanos = active_processor_count * (total_cpu_nanos - _total_cpu_nanos);
	if (delta_nanos == 0) {
	// Avoid division by zero
	return OS_ERR;
	}

	*pjvmUserLoad = normalize((double)(jvm_user_nanos - _jvm_user_nanos)/delta_nanos);
	*pjvmKernelLoad = normalize((double)(jvm_system_nanos - _jvm_system_nanos)/delta_nanos);

	_active_processor_count = active_processor_count;
	_total_cpu_nanos = total_cpu_nanos;
	_jvm_user_nanos = jvm_user_nanos;
	_jvm_system_nanos = jvm_system_nanos;

	return result;
	#else
	return FUNCTIONALITY_NOT_IMPLEMENTED;
	#endif
	}

	int CPUPerformanceInterface::CPUPerformance::context_switch_rate(double* rate) {
	#ifdef __APPLE__
	mach_port_t task = mach_task_self();
	mach_msg_type_number_t task_info_count = TASK_INFO_MAX;
	task_info_data_t task_info_data;
	kern_return_t kr = task_info(task, TASK_EVENTS_INFO, (task_info_t)task_info_data, &task_info_count);
	if (kr != KERN_SUCCESS) {
	return OS_ERR;
	}

	int result = OS_OK;
	if (_total_csr_nanos == 0 \|\| _jvm_context_switches == 0) {
	// First call just set initial values.
	result = OS_ERR;
	}

	long jvm_context_switches = ((task_events_info_t)task_info_data)->csw;

	long total_csr_nanos;
	if(!now_in_nanos(&total_csr_nanos)) {
	return OS_ERR;
	}
	double delta_in_sec = (double)(total_csr_nanos - _total_csr_nanos) / NANOS_PER_SEC;
	if (delta_in_sec == 0.0) {
	// Avoid division by zero
	return OS_ERR;
	}

	*rate = (jvm_context_switches - _jvm_context_switches) / delta_in_sec;

	_jvm_context_switches = jvm_context_switches;
	_total_csr_nanos = total_csr_nanos;

	return result;
	#else
	return FUNCTIONALITY_NOT_IMPLEMENTED;
	#endif
	}

	CPUPerformanceInterface::CPUPerformanceInterface() {
	_impl = NULL;
	}

	bool CPUPerformanceInterface::initialize() {
	_impl = new CPUPerformanceInterface::CPUPerformance();
	return _impl != NULL && _impl->initialize();
	}

	CPUPerformanceInterface::~CPUPerformanceInterface() {
	if (_impl != NULL) {
	delete _impl;
	}
	}

	int CPUPerformanceInterface::cpu_load(int which_logical_cpu, double* cpu_load) const {
	return _impl->cpu_load(which_logical_cpu, cpu_load);
	}

	int CPUPerformanceInterface::cpu_load_total_process(double* cpu_load) const {
	return _impl->cpu_load_total_process(cpu_load);
	}

	int CPUPerformanceInterface::cpu_loads_process(double* pjvmUserLoad, double* pjvmKernelLoad, double* psystemTotalLoad) const {
	return _impl->cpu_loads_process(pjvmUserLoad, pjvmKernelLoad, psystemTotalLoad);
	}

	int CPUPerformanceInterface::context_switch_rate(double* rate) const {
	return _impl->context_switch_rate(rate);
	}

	class SystemProcessInterface::SystemProcesses : public CHeapObj<mtInternal> {
	friend class SystemProcessInterface;
	private:
	SystemProcesses();
	bool initialize();
	SystemProcesses(const SystemProcesses& rhs); // no impl
	SystemProcesses& operator=(const SystemProcesses& rhs); // no impl
	~SystemProcesses();

	//information about system processes
	int system_processes(SystemProcess** system_processes, int* no_of_sys_processes) const;
	};

	SystemProcessInterface::SystemProcesses::SystemProcesses() {
	}

	bool SystemProcessInterface::SystemProcesses::initialize() {
	return true;
	}

	SystemProcessInterface::SystemProcesses::~SystemProcesses() {
	}
	int SystemProcessInterface::SystemProcesses::system_processes(SystemProcess** system_processes, int* no_of_sys_processes) const {
	assert(system_processes != NULL, "system_processes pointer is NULL!");
	assert(no_of_sys_processes != NULL, "system_processes counter pointer is NULL!");
	#ifdef __APPLE__
	pid_t* pids = NULL;
	int pid_count = 0;
	ResourceMark rm;

	int try_count = 0;
	while (pids == NULL) {
	// Find out buffer size
	size_t pids_bytes = proc_listpids(PROC_ALL_PIDS, 0, NULL, 0);
	if (pids_bytes <= 0) {
	return OS_ERR;
	}
	pid_count = pids_bytes / sizeof(pid_t);
	pids = NEW_RESOURCE_ARRAY(pid_t, pid_count);
	memset(pids, 0, pids_bytes);

	pids_bytes = proc_listpids(PROC_ALL_PIDS, 0, pids, pids_bytes);
	if (pids_bytes <= 0) {
	// couldn't fit buffer, retry.
	FREE_RESOURCE_ARRAY(pid_t, pids, pid_count);
	pids = NULL;
	try_count++;
	if (try_count > 3) {
	return OS_ERR;
	}
	} else {
	pid_count = pids_bytes / sizeof(pid_t);
	}
	}

	int process_count = 0;
	SystemProcess* next = NULL;
	for (int i = 0; i < pid_count; i++) {
	pid_t pid = pids[i];
	if (pid != 0) {
	char buffer[PROC_PIDPATHINFO_MAXSIZE];
	memset(buffer, 0 , sizeof(buffer));
	if (proc_pidpath(pid, buffer, sizeof(buffer)) != -1) {
	int length = strlen(buffer);
	if (length > 0) {
	SystemProcess* current = new SystemProcess();
	char * path = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
	strcpy(path, buffer);
	current->set_path(path);
	current->set_pid((int)pid);
	current->set_next(next);
	next = current;
	process_count++;
	}
	}
	}
	}

	*no_of_sys_processes = process_count;
	*system_processes = next;

	return OS_OK;
	#endif
	return FUNCTIONALITY_NOT_IMPLEMENTED;
	}

	int SystemProcessInterface::system_processes(SystemProcess** system_procs, int* no_of_sys_processes) const {
	return _impl->system_processes(system_procs, no_of_sys_processes);
	}

	SystemProcessInterface::SystemProcessInterface() {
	_impl = NULL;
	}

	bool SystemProcessInterface::initialize() {
	_impl = new SystemProcessInterface::SystemProcesses();
	return _impl != NULL && _impl->initialize();
	}

	SystemProcessInterface::~SystemProcessInterface() {
	if (_impl != NULL) {
	delete _impl;
	}
	}

	CPUInformationInterface::CPUInformationInterface() {
	_cpu_info = NULL;
	}

	bool CPUInformationInterface::initialize() {
	_cpu_info = new CPUInformation();

	if (NULL == _cpu_info) {
	return false;
	}
	_cpu_info->set_number_of_hardware_threads(VM_Version_Ext::number_of_threads());
	_cpu_info->set_number_of_cores(VM_Version_Ext::number_of_cores());
	_cpu_info->set_number_of_sockets(VM_Version_Ext::number_of_sockets());
	_cpu_info->set_cpu_name(VM_Version_Ext::cpu_name());
	_cpu_info->set_cpu_description(VM_Version_Ext::cpu_description());

	return true;
	}

	CPUInformationInterface::~CPUInformationInterface() {
	if (_cpu_info != NULL) {
	if (_cpu_info->cpu_name() != NULL) {
	const char* cpu_name = _cpu_info->cpu_name();
	FREE_C_HEAP_ARRAY(char, cpu_name);
	_cpu_info->set_cpu_name(NULL);
	}
	if (_cpu_info->cpu_description() != NULL) {
	const char* cpu_desc = _cpu_info->cpu_description();
	FREE_C_HEAP_ARRAY(char, cpu_desc);
	_cpu_info->set_cpu_description(NULL);
	}
	delete _cpu_info;
	}
	}

	int CPUInformationInterface::cpu_information(CPUInformation& cpu_info) {
	if (NULL == _cpu_info) {
	return OS_ERR;
	}

	cpu_info = *_cpu_info; // shallow copy assignment
	return OS_OK;
	}