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| author | Lasse Collin <lasse.collin@tukaani.org> | 2009-02-14 00:45:29 +0200 |
|---|---|---|
| committer | Lasse Collin <lasse.collin@tukaani.org> | 2009-02-14 00:45:29 +0200 |
| commit | 3084d662d2646ab7eb58daf0dc32cf3f9a74eec7 (patch) | |
| tree | 6601b6dee1b3c35b6894d71fcdbf1554801aff4f /m4/lc_cpucores.m4 | |
| parent | Initial port to DOS using DJGPP. (diff) | |
| download | xz-3084d662d2646ab7eb58daf0dc32cf3f9a74eec7.tar.xz | |
Cleanups to the code that detects the amount of RAM and
the number of CPU cores. Added support for using sysinfo()
on Linux systems whose libc lacks appropriate sysconf()
support (at least dietlibc). The Autoconf macros were
split into separate files, and CPU core count detection
was moved from hardware.c to cpucores.h. The core count
isn't used for anything real for now, so a problematic
part in process.c was commented out.
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 |