lsgrmGetInternalMemory.h 3.13 KB
Newer Older
1 2 3 4 5 6
/*
 * Author:  David Robert Nadeau
 * Site:    http://NadeauSoftware.com/
 * License: Creative Commons Attribution 3.0 Unported License
 *          http://creativecommons.org/licenses/by/3.0/deed.en_US
 */
7 8 9
#ifndef __LSGRM_GETINTERNALMEMORY_H
#define __LSGRM_GETINTERNALMEMORY_H

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
#if defined(_WIN32)
#include <Windows.h>

#elif defined(__unix__) || defined(__unix) || defined(unix) || (defined(__APPLE__) && defined(__MACH__))
#include <unistd.h>
#include <sys/types.h>
#include <sys/param.h>
#if defined(BSD)
#include <sys/sysctl.h>
#endif

#else
#error "Unable to define getMemorySize( ) for an unknown OS."
#endif



/**
 * Returns the size of physical memory (RAM) in bytes.
 */
size_t getMemorySize( )
{
#if defined(_WIN32) && (defined(__CYGWIN__) || defined(__CYGWIN32__))
	/* Cygwin under Windows. ------------------------------------ */
	/* New 64-bit MEMORYSTATUSEX isn't available.  Use old 32.bit */
	MEMORYSTATUS status;
	status.dwLength = sizeof(status);
	GlobalMemoryStatus( &status );
	return (size_t)status.dwTotalPhys;

#elif defined(_WIN32)
	/* Windows. ------------------------------------------------- */
	/* Use new 64-bit MEMORYSTATUSEX, not old 32-bit MEMORYSTATUS */
	MEMORYSTATUSEX status;
	status.dwLength = sizeof(status);
	GlobalMemoryStatusEx( &status );
	return (size_t)status.ullTotalPhys;

#elif defined(__unix__) || defined(__unix) || defined(unix) || (defined(__APPLE__) && defined(__MACH__))
	/* UNIX variants. ------------------------------------------- */
	/* Prefer sysctl() over sysconf() except sysctl() HW_REALMEM and HW_PHYSMEM */

#if defined(CTL_HW) && (defined(HW_MEMSIZE) || defined(HW_PHYSMEM64))
	int mib[2];
	mib[0] = CTL_HW;
#if defined(HW_MEMSIZE)
	mib[1] = HW_MEMSIZE;            /* OSX. --------------------- */
#elif defined(HW_PHYSMEM64)
	mib[1] = HW_PHYSMEM64;          /* NetBSD, OpenBSD. --------- */
#endif
	int64_t size = 0;               /* 64-bit */
	size_t len = sizeof( size );
	if ( sysctl( mib, 2, &size, &len, NULL, 0 ) == 0 )
		return (size_t)size;
	return 0L;			/* Failed? */

#elif defined(_SC_AIX_REALMEM)
	/* AIX. ----------------------------------------------------- */
	return (size_t)sysconf( _SC_AIX_REALMEM ) * (size_t)1024L;

#elif defined(_SC_PHYS_PAGES) && defined(_SC_PAGESIZE)
	/* FreeBSD, Linux, OpenBSD, and Solaris. -------------------- */
	return (size_t)sysconf( _SC_PHYS_PAGES ) *
		(size_t)sysconf( _SC_PAGESIZE );

#elif defined(_SC_PHYS_PAGES) && defined(_SC_PAGE_SIZE)
	/* Legacy. -------------------------------------------------- */
	return (size_t)sysconf( _SC_PHYS_PAGES ) *
		(size_t)sysconf( _SC_PAGE_SIZE );

#elif defined(CTL_HW) && (defined(HW_PHYSMEM) || defined(HW_REALMEM))
	/* DragonFly BSD, FreeBSD, NetBSD, OpenBSD, and OSX. -------- */
	int mib[2];
	mib[0] = CTL_HW;
#if defined(HW_REALMEM)
	mib[1] = HW_REALMEM;		/* FreeBSD. ----------------- */
#elif defined(HW_PYSMEM)
	mib[1] = HW_PHYSMEM;		/* Others. ------------------ */
#endif
	unsigned int size = 0;		/* 32-bit */
	size_t len = sizeof( size );
	if ( sysctl( mib, 2, &size, &len, NULL, 0 ) == 0 )
		return (size_t)size;
	return 0L;			/* Failed? */
#endif /* sysctl and sysconf variants */

#else
	return 0L;			/* Unknown OS. */
#endif
}
100 101

#endif