178 lines
4.7 KiB
Plaintext
178 lines
4.7 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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# - sched_getaffinity(): glibc (GNU/Linux, GNU/kFreeBSD)
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# - cpuset_getaffinity(): FreeBSD
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# - sysctl(): BSDs, OS/2
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# - sysconf(): GNU/Linux, Solaris, Tru64, IRIX, AIX, QNX, 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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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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# glibc-based systems (GNU/Linux and GNU/kFreeBSD) have sched_getaffinity().
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# The CPU_COUNT() macro was added in glibc 2.9 so we try to link the
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# test program instead of merely compiling it. glibc 2.9 is old enough that
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# if someone uses the code on older glibc, the fallback to sysconf() should
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# be good enough.
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AC_LINK_IFELSE([AC_LANG_SOURCE([[
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#include <sched.h>
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int
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main(void)
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{
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cpu_set_t cpu_mask;
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sched_getaffinity(0, sizeof(cpu_mask), &cpu_mask);
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return CPU_COUNT(&cpu_mask);
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}
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]])], [tuklib_cv_cpucores_method=sched_getaffinity], [
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# FreeBSD has both cpuset and sysctl. Look for cpuset first because
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# it's a better approach.
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#
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# This test would match on GNU/kFreeBSD too but it would require
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# -lfreebsd-glue when linking and thus in the current form this would
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# fail on GNU/kFreeBSD. The above test for sched_getaffinity() matches
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# on GNU/kFreeBSD so the test below should never run on that OS.
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
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#include <sys/param.h>
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#include <sys/cpuset.h>
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int
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main(void)
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{
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cpuset_t set;
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cpuset_getaffinity(CPU_LEVEL_WHICH, CPU_WHICH_PID, -1,
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sizeof(set), &set);
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return 0;
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}
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]])], [tuklib_cv_cpucores_method=cpuset], [
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# On OS/2, both sysconf() and sysctl() pass the tests in this file,
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# but only sysctl() works. On QNX it's the opposite: only sysconf() works
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# (although it assumes that _POSIX_SOURCE, _XOPEN_SOURCE, and _POSIX_C_SOURCE
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# are undefined or alternatively _QNX_SOURCE is defined).
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#
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# We test sysctl() first and intentionally break the sysctl() test on QNX
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# so that sysctl() is never used on QNX.
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
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#ifdef __QNX__
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compile error
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#endif
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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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#ifdef HW_NCPUONLINE
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/* This is preferred on OpenBSD, see tuklib_cpucores.c. */
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int name[2] = { CTL_HW, HW_NCPUONLINE };
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#else
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int name[2] = { CTL_HW, HW_NCPU };
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#endif
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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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sched_getaffinity)
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AC_DEFINE([TUKLIB_CPUCORES_SCHED_GETAFFINITY], [1],
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[Define to 1 if the number of available CPU cores
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can be detected with sched_getaffinity()])
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;;
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cpuset)
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AC_DEFINE([TUKLIB_CPUCORES_CPUSET], [1],
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[Define to 1 if the number of available CPU cores
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can be detected with cpuset(2).])
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;;
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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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