mirror of https://git.tukaani.org/xz.git
106 lines
2.3 KiB
Plaintext
106 lines
2.3 KiB
Plaintext
#
|
|
# SYNOPSIS
|
|
#
|
|
# TUKLIB_CPUCORES
|
|
#
|
|
# DESCRIPTION
|
|
#
|
|
# Check how to find out the number of available CPU cores in the system.
|
|
# This information is used by tuklib_cpucores.c.
|
|
#
|
|
# Supported methods:
|
|
# - sysctl(): BSDs, OS/2
|
|
# - sysconf(): GNU/Linux, Solaris, Tru64, IRIX, AIX, Cygwin
|
|
# - pstat_getdynamic(): HP-UX
|
|
#
|
|
# COPYING
|
|
#
|
|
# Author: Lasse Collin
|
|
#
|
|
# This file has been put into the public domain.
|
|
# You can do whatever you want with this file.
|
|
#
|
|
|
|
AC_DEFUN_ONCE([TUKLIB_CPUCORES], [
|
|
AC_REQUIRE([TUKLIB_COMMON])
|
|
|
|
# sys/param.h might be needed by sys/sysctl.h.
|
|
AC_CHECK_HEADERS([sys/param.h])
|
|
|
|
AC_CACHE_CHECK([how to detect the number of available CPU cores],
|
|
[tuklib_cv_cpucores_method], [
|
|
|
|
# Look for sysctl() solution first, because on OS/2, both sysconf()
|
|
# and sysctl() pass the tests in this file, but only sysctl()
|
|
# actually works.
|
|
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
|
|
#include <sys/types.h>
|
|
#ifdef HAVE_SYS_PARAM_H
|
|
# include <sys/param.h>
|
|
#endif
|
|
#include <sys/sysctl.h>
|
|
int
|
|
main(void)
|
|
{
|
|
int name[2] = { CTL_HW, HW_NCPU };
|
|
int cpus;
|
|
size_t cpus_size = sizeof(cpus);
|
|
sysctl(name, 2, &cpus, &cpus_size, NULL, 0);
|
|
return 0;
|
|
}
|
|
]])], [tuklib_cv_cpucores_method=sysctl], [
|
|
|
|
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
|
|
#include <unistd.h>
|
|
int
|
|
main(void)
|
|
{
|
|
long i;
|
|
#ifdef _SC_NPROCESSORS_ONLN
|
|
/* Many systems using sysconf() */
|
|
i = sysconf(_SC_NPROCESSORS_ONLN);
|
|
#else
|
|
/* IRIX */
|
|
i = sysconf(_SC_NPROC_ONLN);
|
|
#endif
|
|
return 0;
|
|
}
|
|
]])], [tuklib_cv_cpucores_method=sysconf], [
|
|
|
|
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
|
|
#include <sys/param.h>
|
|
#include <sys/pstat.h>
|
|
|
|
int
|
|
main(void)
|
|
{
|
|
struct pst_dynamic pst;
|
|
pstat_getdynamic(&pst, sizeof(pst), 1, 0);
|
|
(void)pst.psd_proc_cnt;
|
|
return 0;
|
|
}
|
|
]])], [tuklib_cv_cpucores_method=pstat_getdynamic], [
|
|
|
|
tuklib_cv_cpucores_method=unknown
|
|
])])])])
|
|
|
|
case $tuklib_cv_cpucores_method in
|
|
sysctl)
|
|
AC_DEFINE([TUKLIB_CPUCORES_SYSCTL], [1],
|
|
[Define to 1 if the number of available CPU cores
|
|
can be detected with sysctl().])
|
|
;;
|
|
sysconf)
|
|
AC_DEFINE([TUKLIB_CPUCORES_SYSCONF], [1],
|
|
[Define to 1 if the number of available CPU cores
|
|
can be detected with sysconf(_SC_NPROCESSORS_ONLN)
|
|
or sysconf(_SC_NPROC_ONLN).])
|
|
;;
|
|
pstat_getdynamic)
|
|
AC_DEFINE([TUKLIB_CPUCORES_PSTAT_GETDYNAMIC], [1],
|
|
[Define to 1 if the number of available CPU cores
|
|
can be detected with pstat_getdynamic().])
|
|
;;
|
|
esac
|
|
])dnl
|