87 lines
2.5 KiB
C++
87 lines
2.5 KiB
C++
/*
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open source routing machine
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Copyright (C) Dennis Luxen, others 2010
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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 AFFERO General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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any later version.
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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 for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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or see http://www.gnu.org/licenses/agpl.txt.
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*/
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#ifndef MACHINE_INFO_H
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#define MACHINE_INFO_H
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#if defined(__APPLE__) || defined(__FreeBSD__)
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extern "C" {
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#include <sys/types.h>
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#include <sys/sysctl.h>
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}
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#elif defined _WIN32
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#include <windows.h>
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#endif
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enum Endianness {
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LittleEndian = 1,
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BigEndian = 2
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};
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//Function is optimized to a single 'mov eax,1' on GCC, clang and icc using -O3
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inline Endianness getMachineEndianness() {
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int i(1);
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char *p = (char *) &i;
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if (1 == p[0])
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return LittleEndian;
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return BigEndian;
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}
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// Reverses Network Byte Order into something usable, compiles down to a bswap-mov combination
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inline unsigned swapEndian(unsigned x) {
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if(getMachineEndianness() == LittleEndian)
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return ( (x>>24) | ((x<<8) & 0x00FF0000) | ((x>>8) & 0x0000FF00) | (x<<24) );
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return x;
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}
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// Returns the physical memory size in kilobytes
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inline unsigned GetPhysicalmemory(void){
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#if defined(SUN5) || defined(__linux__)
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return (sysconf(_SC_PHYS_PAGES) * sysconf(_SC_PAGESIZE));
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#elif defined(__APPLE__)
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int mib[2] = {CTL_HW, HW_MEMSIZE};
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long long memsize;
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size_t len = sizeof(memsize);
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sysctl(mib, 2, &memsize, &len, NULL, 0);
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return memsize/1024;
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#elif defined(__FreeBSD__)
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int mib[2] = {CTL_HW, HW_PHYSMEM};
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long long memsize;
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size_t len = sizeof(memsize);
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sysctl(mib, 2, &memsize, &len, NULL, 0);
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return memsize/1024;
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#elif defined(_WIN32)
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MEMORYSTATUSEX status;
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status.dwLength = sizeof(status);
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GlobalMemoryStatusEx(&status);
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return status.ullTotalPhys/1024;
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#else
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std::cout << "[Warning] Compiling on unknown architecture." << std::endl
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<< "Please file a ticket at http://project-osrm.org" << std::endl;
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return 2048*1024; /* 128 Mb default memory */
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#endif
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}
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#endif // MACHINE_INFO_H
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