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/* -*- mode: C++; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 99; -*- */
/* vim: set ts=4 sw=4 et tw=99: */
/*
* distcc -- A simple distributed compiler system
*
* Copyright (C) 2003 by Martin Pool <mbp@samba.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/* Thanks to Dimitri PAPADOPOULOS-ORFANOS for researching many of the methods
* in this file. */
#include "config.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <sys/stat.h>
#include "ncpus.h"
#include "exitcode.h"
/**
* Determine number of processors online.
*
* We will in the future use this to gauge how many concurrent tasks
* should run on this machine. Obviously this is only very rough: the
* correct number needs to take into account disk buffers, IO
* bandwidth, other tasks, etc.
**/
#if defined(__hpux__) || defined(__hpux)
#include <sys/param.h>
#include <sys/pstat.h>
int dcc_ncpus(int *ncpus)
{
struct pst_dynamic psd;
if (pstat_getdynamic(&psd, sizeof(psd), 1, 0) != -1) {
*ncpus = psd.psd_proc_cnt;
return 0;
}
rs_log_error("pstat_getdynamic failed: %s", strerror(errno));
*ncpus = 1;
return EXIT_DISTCC_FAILED;
}
#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__) || defined(__bsdi__) || defined(__DragonFly__)
/* http://www.FreeBSD.org/cgi/man.cgi?query=sysctl&sektion=3&manpath=FreeBSD+4.6-stable
http://www.openbsd.org/cgi-bin/man.cgi?query=sysctl&sektion=3&manpath=OpenBSD+Current
http://www.tac.eu.org/cgi-bin/man-cgi?sysctl+3+NetBSD-current
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/sysctl.h>
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
#undef HAVE_RS_LOG_ERROR
#else
#define HAVE_RS_LOG_ERROR
#endif
int dcc_ncpus(int *ncpus)
{
int mib[2];
size_t len = sizeof(*ncpus);
mib[0] = CTL_HW;
mib[1] = HW_NCPU;
if (sysctl(mib, 2, ncpus, &len, NULL, 0) == 0) {
return 0;
}
#ifdef have_rs_log_error
rs_log_error("sysctl(CTL_HW:HW_NCPU) failed: %s",
strerror(errno));
#else
fprintf(stderr, "sysctl(CTL_HW:HW_NCPU) failed: %s", strerror(errno));
#endif
*ncpus = 1;
return EXIT_DISTCC_FAILED;
}
#else /* every other system */
/*
http://www.opengroup.org/onlinepubs/007904975/functions/sysconf.html
http://docs.sun.com/?p=/doc/816-0213/6m6ne38dd&a=view
http://www.tru64unix.compaq.com/docs/base_doc/DOCUMENTATION/V40G_HTML/MAN/MAN3/0629____.HTM
http://techpubs.sgi.com/library/tpl/cgi-bin/getdoc.cgi?coll=0650&db=man&fname=/usr/share/catman/p_man/cat3c/sysconf.z
*/
int dcc_ncpus(int *ncpus)
{
#if defined(_SC_NPROCESSORS_ONLN)
/* Linux, Solaris, Tru64, UnixWare 7, and Open UNIX 8 */
*ncpus = sysconf(_SC_NPROCESSORS_ONLN);
#elif defined(_SC_NPROC_ONLN)
/* IRIX */
*ncpus = sysconf(_SC_NPROC_ONLN);
#else
#warning "Please port this function"
*ncpus = -1; /* unknown */
#endif
if (*ncpus == -1) {
*ncpus = 1;
return EXIT_DISTCC_FAILED;
}
if (*ncpus == 0) {
/* if there are no cpus, what are we running on? But it has
* apparently been observed to happen on ARM Linux
*/
*ncpus = 1;
}
return 0;
}
#endif
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