diff options
Diffstat (limited to 'm4/lc_cpucores.m4')
| -rw-r--r-- | m4/lc_cpucores.m4 | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/m4/lc_cpucores.m4 b/m4/lc_cpucores.m4 new file mode 100644 index 00000000..5e4e02d7 --- /dev/null +++ b/m4/lc_cpucores.m4 @@ -0,0 +1,57 @@ +dnl ########################################################################### +dnl +dnl lc_CPUCORES - Check how to find out the number of online CPU cores +dnl +dnl Check how to find out the number of available CPU cores in the system. +dnl sysconf(_SC_NPROCESSORS_ONLN) works on most systems, except that BSDs +dnl use sysctl(). +dnl +dnl ########################################################################### +dnl +dnl Author: Lasse Collin +dnl +dnl This file has been put into the public domain. +dnl You can do whatever you want with this file. +dnl +dnl ########################################################################### +AC_DEFUN([lc_CPUCORES], [ +AC_MSG_CHECKING([how to detect the number of available CPU cores]) +AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ +#include <unistd.h> +int +main(void) +{ + long i; + i = sysconf(_SC_NPROCESSORS_ONLN); + return 0; +} +]])], [ + AC_DEFINE([HAVE_NCPU_SYSCONF], [1], + [Define to 1 if the number of available CPU cores can be + detected with sysconf(_SC_NPROCESSORS_ONLN).]) + AC_MSG_RESULT([sysconf]) +], [ +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, NULL); + return 0; +} +]])], [ + AC_DEFINE([HAVE_NCPU_SYSCTL], [1], + [Define to 1 if the number of available CPU cores can be + detected with sysctl().]) + AC_MSG_RESULT([sysctl]) +], [ + AC_MSG_RESULT([unknown]) +])]) +])dnl lc_CPUCORES |