mirror of https://git.tukaani.org/xz.git
58 lines
1.5 KiB
Plaintext
58 lines
1.5 KiB
Plaintext
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dnl ###########################################################################
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dnl
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dnl lc_CPUCORES - Check how to find out the number of online CPU cores
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dnl
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dnl Check how to find out the number of available CPU cores in the system.
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dnl sysconf(_SC_NPROCESSORS_ONLN) works on most systems, except that BSDs
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dnl use sysctl().
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dnl
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dnl ###########################################################################
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dnl
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dnl Author: Lasse Collin
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dnl
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dnl This file has been put into the public domain.
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dnl You can do whatever you want with this file.
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dnl
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dnl ###########################################################################
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AC_DEFUN([lc_CPUCORES], [
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AC_MSG_CHECKING([how to detect the number of available CPU cores])
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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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AC_DEFINE([HAVE_NCPU_SYSCONF], [1],
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[Define to 1 if the number of available CPU cores can be
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detected with sysconf(_SC_NPROCESSORS_ONLN).])
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AC_MSG_RESULT([sysconf])
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], [
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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, NULL);
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return 0;
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}
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]])], [
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AC_DEFINE([HAVE_NCPU_SYSCTL], [1],
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[Define to 1 if the number of available CPU cores can be
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detected with sysctl().])
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AC_MSG_RESULT([sysctl])
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], [
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AC_MSG_RESULT([unknown])
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])])
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])dnl lc_CPUCORES
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