HostInfoHurd.h

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/*
**  This is a greatly MODIFIED version of a "top" machine dependent file.
**  The only resemblance it bears to the original is with respect to the
**  mechanics of finding various system details. The copyright details
**  follow.
**
**  This is a modified version of the osf1 version.
**
**  --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- ---
**
**  Top users/processes display for Unix
**  Version 3
**
**  This program may be freely redistributed,
**  but this entire comment MUST remain intact.
**
**  Copyright (c) 1984, 1989, William LeFebvre, Rice University
**  Copyright (c) 1989 - 1994, William LeFebvre, Northwestern University
**  Copyright (c) 1994, 1995, William LeFebvre, Argonne National Laboratory
**  Copyright (c) 1996, William LeFebvre, Group sys Consulting
**  Copyright (c) 2002, Associated Universities Inc.
*/
 
/*
** LIBS: -lstdc++
**
**          AUTHOR:       Darrell Schiebel  <drs@nrao.edu>
**
** ORIGINAL AUTHOR:       Anthony Baxter    <anthony@aaii.oz.au>
** ORIGINAL CONTRIBUTORS: David S. Comay    <dsc@seismo.css.gov>
**                        Claus Kalle
**                        Pat Welch         <tpw@physics.orst.edu>
**                        William LeFebvre  <lefebvre@dis.anl.gov>
**                        Rainer Orth       <ro@techfak.uni-bielefeld.de>
**
*/
 
#ifndef CASA_HOSTINFOHURD_H
#define CASA_HOSTINFOHURD_H
 
# if defined(HOSTINFO_DO_IMPLEMENT)
 
 
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
 
extern "C" {
#include <mach/mach.h>
}
 
namespace casacore { //# NAMESPACE CASACORE - BEGIN
 
// <summary>
// HostInfo for GNU HURD machines.
// </summary>
 
// <use visibility=local>
 
// <reviewed reviewer="UNKNOWN" date="before2004/08/25" tests="" demos="">
// </reviewed>
 
// <prerequisite>
//   <li> <linkto class=HostInfo>HostInfo</linkto>
// </prerequisite>
 
// <synopsis> 
// This file provides the GNU HURD specific functions for HostInfo.
// It is selectively included by HostInfo.cc.
// </synopsis>
//
// <group name="HostInfo">
 
/* Log base 2 of 1024 is 10 (2^10 == 1024) */
#define LOG1024     10
 
/* these are for getting the memory statistics */
static int pageshift;       /* log base 2 of the pagesize */
static int pagesize_;
 
/* define pagetok in terms of pageshift */
#define pagetok(size) ((size) << pageshift)
 
class HostMachineInfo {
friend class HostInfo;
  
    HostMachineInfo( );
    void update_info( );
 
    int valid;
    int cpus;
 
    ptrdiff_t memory_total;
    ptrdiff_t memory_used;
    ptrdiff_t memory_free;
 
    ptrdiff_t swap_total;
    ptrdiff_t swap_used;
    ptrdiff_t swap_free;
};
 
// </group>
 
 
HostMachineInfo::HostMachineInfo( ) : valid(1) {
    int pagesize;
 
    kern_return_t ret;
    struct host_basic_info basic_info;
    mach_msg_type_number_t count = HOST_BASIC_INFO_COUNT;
 
    /* get the page size with "getpagesize" and calculate pageshift from it */
    pagesize_ = pagesize = getpagesize();
    pageshift = 0;
    while (pagesize > 1)
    {
    pageshift++;
    pagesize >>= 1;
    }
 
    /* we only need the amount of log(2)1024 for our conversion */
    pageshift -= LOG1024;
 
       ret = host_info( mach_host_self(), HOST_BASIC_INFO, (host_info_t) &basic_info, &count );
    if ( ret != KERN_SUCCESS ) {
    valid = 0;
    } else {
    memory_total = basic_info.memory_size / 1024;
    cpus = basic_info.avail_cpus;
    }
}
 
void HostMachineInfo::update_info( ) {
 
    vm_statistics_data_t vmstats;
    kern_return_t kr;
 
    /* memory information */
    kr = vm_statistics( mach_task_self(), &vmstats);
    if ( kr != KERN_SUCCESS ) {
      valid = 0;
      return;
    }
 
    memory_used = pagetok(vmstats.active_count + vmstats.wire_count);
    memory_free = memory_total - memory_used;
    swap_used = pagetok( vmstats.active_count + vmstats.inactive_count + vmstats.wire_count );
    swap_free = pagetok( vmstats.free_count );
    swap_total = pagetok( vmstats.active_count + vmstats.inactive_count +
              vmstats.wire_count + vmstats.free_count );
}
 
 
} //# NAMESPACE CASACORE - END
 
# endif
#endif