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