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# nproc.m4
# serial 6
dnl Copyright (C) 2009-2025 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
dnl This file is offered as-is, without any warranty.
AC_DEFUN([gl_NPROC],
[
gl_PREREQ_NPROC
])
# Prerequisites of lib/nproc.c.
AC_DEFUN([gl_PREREQ_NPROC],
[
dnl Persuade glibc <sched.h> to declare CPU_SETSIZE, CPU_ISSET etc.
AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
AC_CHECK_HEADERS([sys/pstat.h sys/sysmp.h sys/param.h],,,
[AC_INCLUDES_DEFAULT])
dnl <sys/sysctl.h> requires <sys/param.h> on OpenBSD 4.0.
AC_CHECK_HEADERS([sys/sysctl.h],,,
[AC_INCLUDES_DEFAULT
#if HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif
])
AC_CHECK_FUNCS([sched_getaffinity_np pstat_getdynamic sysmp sysctl])
gl_CHECK_FUNCS_ANDROID([sched_getaffinity], [[#include <sched.h>]])
dnl Test whether sched_getaffinity has the expected declaration.
dnl glibc 2.3.[0-2]:
dnl int sched_getaffinity (pid_t, unsigned int, unsigned long int *);
dnl glibc 2.3.3:
dnl int sched_getaffinity (pid_t, cpu_set_t *);
dnl glibc >= 2.3.4:
dnl int sched_getaffinity (pid_t, size_t, cpu_set_t *);
if test $ac_cv_func_sched_getaffinity = yes; then
AC_CACHE_CHECK([for glibc compatible sched_getaffinity],
[gl_cv_func_sched_getaffinity3],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[#include <errno.h>
#include <sched.h>]],
[[sched_getaffinity (0, 0, (cpu_set_t *) 0);]])],
[gl_cv_func_sched_getaffinity3=yes],
[gl_cv_func_sched_getaffinity3=no])
])
if test $gl_cv_func_sched_getaffinity3 = yes; then
AC_DEFINE([HAVE_SCHED_GETAFFINITY_LIKE_GLIBC], [1],
[Define to 1 if sched_getaffinity has a glibc compatible declaration.])
fi
fi
])
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