diff options
Diffstat (limited to 'm4/tuklib_cpucores.m4')
| -rw-r--r-- | m4/tuklib_cpucores.m4 | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/m4/tuklib_cpucores.m4 b/m4/tuklib_cpucores.m4 new file mode 100644 index 00000000..9058d445 --- /dev/null +++ b/m4/tuklib_cpucores.m4 @@ -0,0 +1,72 @@ +# +# 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. +# +# Currently this supports sysctl() (BSDs, OS/2) and sysconf() (GNU/Linux, +# Solaris, Cygwin). +# +# 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_MSG_CHECKING([how to detect the number of available CPU cores]) + +# Look for sysctl() solution first, because on OS/2, both sysconf() +# and sysctl() pass the tests in this file, but only sysctl() +# actually works. +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, 0); + return 0; +} +]])], [ + AC_DEFINE([TUKLIB_CPUCORES_SYSCTL], [1], + [Define to 1 if the number of available CPU cores can be + detected with sysctl().]) + AC_MSG_RESULT([sysctl]) +], [ + +AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ +#include <unistd.h> +int +main(void) +{ + long i; + i = sysconf(_SC_NPROCESSORS_ONLN); + return 0; +} +]])], [ + AC_DEFINE([TUKLIB_CPUCORES_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_MSG_RESULT([unknown]) +])]) +])dnl |