mirror of https://git.tukaani.org/xz.git
121 lines
2.8 KiB
Plaintext
121 lines
2.8 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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# Supported methods:
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# - GetSystemInfo(): Windows (including Cygwin)
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# - sysctl(): BSDs, OS/2
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# - sysconf(): GNU/Linux, Solaris, Tru64, IRIX, AIX, Cygwin (but
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# GetSystemInfo() is used on Cygwin)
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# - pstat_getdynamic(): HP-UX
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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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# Maybe checking $host_os would be enough but this matches what
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# tuklib_cpucores.c does.
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#
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# NOTE: IRIX has a compiler that doesn't error out with #error, so use
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# a non-compilable text instead of #error to generate an error.
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
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#if defined(_WIN32) || defined(__CYGWIN__)
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int main(void) { return 0; }
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#else
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compile error
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#endif
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]])], [tuklib_cv_cpucores_method=special], [
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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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#ifdef _SC_NPROCESSORS_ONLN
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/* Many systems using sysconf() */
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i = sysconf(_SC_NPROCESSORS_ONLN);
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#else
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/* IRIX */
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i = sysconf(_SC_NPROC_ONLN);
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#endif
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return 0;
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}
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]])], [tuklib_cv_cpucores_method=sysconf], [
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
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#include <sys/param.h>
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#include <sys/pstat.h>
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int
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main(void)
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{
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struct pst_dynamic pst;
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pstat_getdynamic(&pst, sizeof(pst), 1, 0);
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(void)pst.psd_proc_cnt;
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return 0;
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}
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]])], [tuklib_cv_cpucores_method=pstat_getdynamic], [
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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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or sysconf(_SC_NPROC_ONLN).])
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;;
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pstat_getdynamic)
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AC_DEFINE([TUKLIB_CPUCORES_PSTAT_GETDYNAMIC], [1],
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[Define to 1 if the number of available CPU cores
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can be detected with pstat_getdynamic().])
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;;
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esac
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])dnl
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