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/*
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* Copyright (c) 2012, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "pdh_interface.hpp"
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#include "runtime/os.hpp"
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#include "utilities/macros.hpp"
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// PDH API
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typedef PDH_STATUS (WINAPI *PdhAddCounter_Fn)(HQUERY, LPCSTR, DWORD, HCOUNTER*);
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typedef PDH_STATUS (WINAPI *PdhOpenQuery_Fn)(LPCWSTR, DWORD, HQUERY*);
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typedef DWORD (WINAPI *PdhCloseQuery_Fn)(HQUERY);
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typedef PDH_STATUS (WINAPI *PdhCollectQueryData_Fn)(HQUERY);
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typedef DWORD (WINAPI *PdhGetFormattedCounterValue_Fn)(HCOUNTER, DWORD, LPDWORD, PPDH_FMT_COUNTERVALUE);
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typedef PDH_STATUS (WINAPI *PdhEnumObjectItems_Fn)(LPCTSTR, LPCTSTR, LPCTSTR, LPTSTR, LPDWORD, LPTSTR, LPDWORD, DWORD, DWORD);
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typedef PDH_STATUS (WINAPI *PdhRemoveCounter_Fn)(HCOUNTER);
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typedef PDH_STATUS (WINAPI *PdhLookupPerfNameByIndex_Fn)(LPCSTR, DWORD, LPSTR, LPDWORD);
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typedef PDH_STATUS (WINAPI *PdhMakeCounterPath_Fn)(PDH_COUNTER_PATH_ELEMENTS*, LPTSTR, LPDWORD, DWORD);
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PdhAddCounter_Fn PdhDll::_PdhAddCounter = NULL;
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PdhOpenQuery_Fn PdhDll::_PdhOpenQuery = NULL;
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PdhCloseQuery_Fn PdhDll::_PdhCloseQuery = NULL;
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PdhCollectQueryData_Fn PdhDll::_PdhCollectQueryData = NULL;
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PdhGetFormattedCounterValue_Fn PdhDll::_PdhGetFormattedCounterValue = NULL;
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PdhEnumObjectItems_Fn PdhDll::_PdhEnumObjectItems = NULL;
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PdhRemoveCounter_Fn PdhDll::_PdhRemoveCounter = NULL;
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PdhLookupPerfNameByIndex_Fn PdhDll::_PdhLookupPerfNameByIndex = NULL;
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PdhMakeCounterPath_Fn PdhDll::_PdhMakeCounterPath = NULL;
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LONG PdhDll::_critical_section = 0;
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LONG PdhDll::_initialized = 0;
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LONG PdhDll::_pdh_reference_count = 0;
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HMODULE PdhDll::_hModule = NULL;
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void PdhDll::initialize(void) {
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_hModule = os::win32::load_Windows_dll("pdh.dll", NULL, 0);
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if (NULL == _hModule) {
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return;
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}
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// The 'A' at the end means the ANSI (not the UNICODE) vesions of the methods
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_PdhAddCounter = (PdhAddCounter_Fn)::GetProcAddress(_hModule, "PdhAddCounterA");
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_PdhOpenQuery = (PdhOpenQuery_Fn)::GetProcAddress(_hModule, "PdhOpenQueryA");
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_PdhCloseQuery = (PdhCloseQuery_Fn)::GetProcAddress(_hModule, "PdhCloseQuery");
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_PdhCollectQueryData = (PdhCollectQueryData_Fn)::GetProcAddress(_hModule, "PdhCollectQueryData");
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_PdhGetFormattedCounterValue = (PdhGetFormattedCounterValue_Fn)::GetProcAddress(_hModule, "PdhGetFormattedCounterValue");
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_PdhEnumObjectItems = (PdhEnumObjectItems_Fn)::GetProcAddress(_hModule, "PdhEnumObjectItemsA");
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_PdhRemoveCounter = (PdhRemoveCounter_Fn)::GetProcAddress(_hModule, "PdhRemoveCounter");
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_PdhLookupPerfNameByIndex = (PdhLookupPerfNameByIndex_Fn)::GetProcAddress(_hModule, "PdhLookupPerfNameByIndexA");
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_PdhMakeCounterPath = (PdhMakeCounterPath_Fn)::GetProcAddress(_hModule, "PdhMakeCounterPathA");
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InterlockedExchange(&_initialized, 1);
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}
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bool PdhDll::PdhDetach(void) {
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LONG prev_ref_count = InterlockedExchangeAdd(&_pdh_reference_count, -1);
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BOOL ret = false;
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if (1 == prev_ref_count) {
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if (_initialized && _hModule != NULL) {
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ret = FreeLibrary(_hModule);
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if (ret) {
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_hModule = NULL;
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_PdhAddCounter = NULL;
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_PdhOpenQuery = NULL;
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_PdhCloseQuery = NULL;
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_PdhCollectQueryData = NULL;
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_PdhGetFormattedCounterValue = NULL;
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_PdhEnumObjectItems = NULL;
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_PdhRemoveCounter = NULL;
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_PdhLookupPerfNameByIndex = NULL;
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_PdhMakeCounterPath = NULL;
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InterlockedExchange(&_initialized, 0);
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}
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}
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}
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return ret != 0;
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}
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bool PdhDll::PdhAttach(void) {
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InterlockedExchangeAdd(&_pdh_reference_count, 1);
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if (1 == _initialized) {
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return true;
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}
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while (InterlockedCompareExchange(&_critical_section, 1, 0) == 1);
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if (0 == _initialized) {
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initialize();
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}
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while (InterlockedCompareExchange(&_critical_section, 0, 1) == 0);
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return (_PdhAddCounter != NULL && _PdhOpenQuery != NULL
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&& _PdhCloseQuery != NULL && PdhCollectQueryData != NULL
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&& _PdhGetFormattedCounterValue != NULL && _PdhEnumObjectItems != NULL
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&& _PdhRemoveCounter != NULL && PdhLookupPerfNameByIndex != NULL
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&& _PdhMakeCounterPath != NULL);
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}
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PDH_STATUS PdhDll::PdhAddCounter(HQUERY hQuery, LPCSTR szFullCounterPath, DWORD dwUserData, HCOUNTER* phCounter) {
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assert(_initialized && _PdhAddCounter != NULL, "PdhAvailable() not yet called");
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return _PdhAddCounter(hQuery, szFullCounterPath, dwUserData, phCounter);
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}
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PDH_STATUS PdhDll::PdhOpenQuery(LPCWSTR szDataSource, DWORD dwUserData, HQUERY* phQuery) {
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assert(_initialized && _PdhOpenQuery != NULL, "PdhAvailable() not yet called");
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return _PdhOpenQuery(szDataSource, dwUserData, phQuery);
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}
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DWORD PdhDll::PdhCloseQuery(HQUERY hQuery) {
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assert(_initialized && _PdhCloseQuery != NULL, "PdhAvailable() not yet called");
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return _PdhCloseQuery(hQuery);
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}
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PDH_STATUS PdhDll::PdhCollectQueryData(HQUERY hQuery) {
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assert(_initialized && _PdhCollectQueryData != NULL, "PdhAvailable() not yet called");
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return _PdhCollectQueryData(hQuery);
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}
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DWORD PdhDll::PdhGetFormattedCounterValue(HCOUNTER hCounter, DWORD dwFormat, LPDWORD lpdwType, PPDH_FMT_COUNTERVALUE pValue) {
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assert(_initialized && _PdhGetFormattedCounterValue != NULL, "PdhAvailable() not yet called");
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return _PdhGetFormattedCounterValue(hCounter, dwFormat, lpdwType, pValue);
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}
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PDH_STATUS PdhDll::PdhEnumObjectItems(LPCTSTR szDataSource, LPCTSTR szMachineName, LPCTSTR szObjectName,
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LPTSTR mszCounterList, LPDWORD pcchCounterListLength, LPTSTR mszInstanceList,
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LPDWORD pcchInstanceListLength, DWORD dwDetailLevel, DWORD dwFlags) {
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assert(_initialized && _PdhEnumObjectItems != NULL, "PdhAvailable() not yet called");
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return _PdhEnumObjectItems(szDataSource, szMachineName, szObjectName, mszCounterList, pcchCounterListLength,
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mszInstanceList, pcchInstanceListLength, dwDetailLevel, dwFlags);
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}
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PDH_STATUS PdhDll::PdhRemoveCounter(HCOUNTER hCounter) {
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assert(_initialized && _PdhRemoveCounter != NULL, "PdhAvailable() not yet called");
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return _PdhRemoveCounter(hCounter);
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}
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PDH_STATUS PdhDll::PdhLookupPerfNameByIndex(LPCSTR szMachineName, DWORD dwNameIndex, LPSTR szNameBuffer, LPDWORD pcchNameBufferSize) {
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assert(_initialized && _PdhLookupPerfNameByIndex != NULL, "PdhAvailable() not yet called");
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return _PdhLookupPerfNameByIndex(szMachineName, dwNameIndex, szNameBuffer, pcchNameBufferSize);
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}
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PDH_STATUS PdhDll::PdhMakeCounterPath(PDH_COUNTER_PATH_ELEMENTS* pCounterPathElements, LPTSTR szFullPathBuffer, LPDWORD pcchBufferSize, DWORD dwFlags) {
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assert(_initialized && _PdhMakeCounterPath != NULL, "PdhAvailable() not yet called");
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return _PdhMakeCounterPath(pCounterPathElements, szFullPathBuffer, pcchBufferSize, dwFlags);
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}
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bool PdhDll::PdhStatusFail(PDH_STATUS pdhStat) {
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return pdhStat != ERROR_SUCCESS && pdhStat != PDH_MORE_DATA;
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}
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