64 lines
2.2 KiB
C++
64 lines
2.2 KiB
C++
/* Copyright (c) 2024, Oracle and/or its affiliates.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is designed to work with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have either included with
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the program or referenced in the documentation.
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Without limiting anything contained in the foregoing, this file,
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which is part of C Driver for MySQL (Connector/C), is also subject to the
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Universal FOSS Exception, version 1.0, a copy of which can be found at
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http://oss.oracle.com/licenses/universal-foss-exception.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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/**
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@file mysys/my_system.cc Functions to retrieve system information like total
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Physical memory
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*/
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#include <cassert>
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#include "my_config.h"
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#include "my_dbug.h"
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#ifdef _WIN32
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#include <windows.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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unsigned long long my_physical_memory() {
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unsigned long long mem = 0ULL;
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#ifdef _WIN32
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MEMORYSTATUSEX ms;
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ms.dwLength = sizeof(ms);
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GlobalMemoryStatusEx(&ms);
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mem = ms.ullTotalPhys;
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#elif defined(HAVE_UNISTD_H) /* _WIN32 */
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long pages = sysconf(_SC_PHYS_PAGES);
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long pagesize = sysconf(_SC_PAGESIZE);
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if (pages > 0 && pagesize > 0) {
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mem = static_cast<unsigned long long>(pages * pagesize);
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}
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#else
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#error "Missing implementation of sysconf or GlobalMemoryStatusEx"
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#endif /* HAVE_UNISTD_H */
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assert(mem != 0);
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return mem;
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}
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