e094d1d0f1
tuklib_cpucores.c and tuklib_physmem.c don't include <sys/types.h> even via other files in this package, so clearly that header isn't needed in the tests either (no one has reported build problems due to a missing header in a .c file).
176 lines
4.6 KiB
Plaintext
176 lines
4.6 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:
|
|
# - GetSystemInfo(): Windows (including Cygwin)
|
|
# - sched_getaffinity(): glibc (GNU/Linux, GNU/kFreeBSD)
|
|
# - cpuset_getaffinity(): FreeBSD
|
|
# - sysctl(): BSDs, OS/2
|
|
# - sysconf(): GNU/Linux, Solaris, Tru64, IRIX, AIX, QNX, Cygwin (but
|
|
# GetSystemInfo() is used on 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], [
|
|
|
|
# Maybe checking $host_os would be enough but this matches what
|
|
# tuklib_cpucores.c does.
|
|
#
|
|
# NOTE: IRIX has a compiler that doesn't error out with #error, so use
|
|
# a non-compilable text instead of #error to generate an error.
|
|
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
|
|
#if defined(_WIN32) || defined(__CYGWIN__)
|
|
int main(void) { return 0; }
|
|
#else
|
|
compile error
|
|
#endif
|
|
]])], [tuklib_cv_cpucores_method=special], [
|
|
|
|
# glibc-based systems (GNU/Linux and GNU/kFreeBSD) have sched_getaffinity().
|
|
# The CPU_COUNT() macro was added in glibc 2.9 so we try to link the
|
|
# test program instead of merely compiling it. glibc 2.9 is old enough that
|
|
# if someone uses the code on older glibc, the fallback to sysconf() should
|
|
# be good enough.
|
|
AC_LINK_IFELSE([AC_LANG_SOURCE([[
|
|
#include <sched.h>
|
|
int
|
|
main(void)
|
|
{
|
|
cpu_set_t cpu_mask;
|
|
sched_getaffinity(0, sizeof(cpu_mask), &cpu_mask);
|
|
return CPU_COUNT(&cpu_mask);
|
|
}
|
|
]])], [tuklib_cv_cpucores_method=sched_getaffinity], [
|
|
|
|
# FreeBSD has both cpuset and sysctl. Look for cpuset first because
|
|
# it's a better approach.
|
|
#
|
|
# This test would match on GNU/kFreeBSD too but it would require
|
|
# -lfreebsd-glue when linking and thus in the current form this would
|
|
# fail on GNU/kFreeBSD. The above test for sched_getaffinity() matches
|
|
# on GNU/kFreeBSD so the test below should never run on that OS.
|
|
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
|
|
#include <sys/param.h>
|
|
#include <sys/cpuset.h>
|
|
|
|
int
|
|
main(void)
|
|
{
|
|
cpuset_t set;
|
|
cpuset_getaffinity(CPU_LEVEL_WHICH, CPU_WHICH_PID, -1,
|
|
sizeof(set), &set);
|
|
return 0;
|
|
}
|
|
]])], [tuklib_cv_cpucores_method=cpuset], [
|
|
|
|
# On OS/2, both sysconf() and sysctl() pass the tests in this file,
|
|
# but only sysctl() works. On QNX it's the opposite: only sysconf() works
|
|
# (although it assumes that _POSIX_SOURCE, _XOPEN_SOURCE, and _POSIX_C_SOURCE
|
|
# are undefined or alternatively _QNX_SOURCE is defined).
|
|
#
|
|
# We test sysctl() first and intentionally break the sysctl() test on QNX
|
|
# so that sysctl() is never used on QNX.
|
|
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
|
|
#ifdef __QNX__
|
|
compile error
|
|
#endif
|
|
#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
|
|
sched_getaffinity)
|
|
AC_DEFINE([TUKLIB_CPUCORES_SCHED_GETAFFINITY], [1],
|
|
[Define to 1 if the number of available CPU cores
|
|
can be detected with sched_getaffinity()])
|
|
;;
|
|
cpuset)
|
|
AC_DEFINE([TUKLIB_CPUCORES_CPUSET], [1],
|
|
[Define to 1 if the number of available CPU cores
|
|
can be detected with cpuset(2).])
|
|
;;
|
|
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
|