mem.cpp

/*
 * Original 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
 */

#if defined(_WIN32)
#include <windows.h>
#include <psapi.h>

#elif defined(__unix__) || defined(__unix) || defined(unix) || (defined(__APPLE__) && defined(__MACH__))
#include <unistd.h>
#include <sys/resource.h>

#if defined(__APPLE__) && defined(__MACH__)
#include <mach/mach.h>

#elif (defined(_AIX) || defined(__TOS__AIX__)) || (defined(__sun__) || defined(__sun) || defined(sun) && (defined(__SVR4) || defined(__svr4__)))
#include <fcntl.h>
#include <procfs.h>

#elif defined(__linux__) || defined(__linux) || defined(linux) || defined(__gnu_linux__)
#include <stdio.h>
#endif

#else
#error "Cannot define rss() for an unknown OS."
#endif

/**
 * Returns the current resident set size (physical memory use) measured
 * in bytes, or zero if the value cannot be determined on this OS.
 */
size_t rss() {
  #if defined(_WIN32)
    PROCESS_MEMORY_COUNTERS info;
    GetProcessMemoryInfo( GetCurrentProcess( ), &info, sizeof(info) );
    return (size_t)info.WorkingSetSize;
  #elif defined(__APPLE__) && defined(__MACH__)
    struct mach_task_basic_info info;
    mach_msg_type_number_t infoCount = MACH_TASK_BASIC_INFO_COUNT;
    if ( task_info( mach_task_self( ), MACH_TASK_BASIC_INFO,
      (task_info_t)&info, &infoCount ) != KERN_SUCCESS )
      return (size_t)0L;    /* Can't access? */
    return (size_t)info.resident_size;
  #elif defined(__linux__) || defined(__linux) || defined(linux) || defined(__gnu_linux__)
    long rss = 0L;
    FILE* fp = NULL;
    if ( (fp = fopen( "/proc/self/statm", "r" )) == NULL )
      return (size_t)0L;    /* Can't open? */
    if ( fscanf( fp, "%*s%ld", &rss ) != 1 )
    {
      fclose( fp );
      return (size_t)0L;    /* Can't read? */
    }
    fclose( fp );
    return (size_t)rss * (size_t)sysconf( _SC_PAGESIZE);
  #else
    return (size_t)0L;      /* Unsupported. */
  #endif
}

mem.h

#include <unistd.h>
#include <iostream>
#include <fstream>

size_t rss();