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# sched_h.m4
# serial 16
dnl Copyright (C) 2008-2024 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 Written by Bruno Haible.
AC_DEFUN_ONCE([gl_SCHED_H],
[
dnl Ensure to expand the default settings once only, before all statements
dnl that occur in other macros.
AC_REQUIRE([gl_SCHED_H_DEFAULTS])
AC_REQUIRE([AC_CANONICAL_HOST])
AC_REQUIRE([gl_CHECK_HEADER_SYS_CDEFS_H])
AC_CHECK_HEADERS([sched.h], [], [],
[[#if HAVE_SYS_CDEFS_H
#include <sys/cdefs.h>
#endif
]])
gl_NEXT_HEADERS([sched.h])
if test "$ac_cv_header_sched_h" = yes; then
HAVE_SCHED_H=1
else
HAVE_SCHED_H=0
fi
AC_SUBST([HAVE_SCHED_H])
if test "$HAVE_SCHED_H" = 1; then
AC_CHECK_TYPE([struct sched_param],
[HAVE_STRUCT_SCHED_PARAM=1], [HAVE_STRUCT_SCHED_PARAM=0],
[[#if HAVE_SYS_CDEFS_H
#include <sys/cdefs.h>
#endif
#include <sched.h>
]])
else
HAVE_STRUCT_SCHED_PARAM=0
case "$host_os" in
os2*)
dnl On OS/2 kLIBC, struct sched_param is in spawn.h.
AC_CHECK_TYPE([struct sched_param],
[HAVE_STRUCT_SCHED_PARAM=1], [],
[#include <spawn.h>])
;;
vms)
dnl On OpenVMS 7.2 or newer, struct sched_param is in pthread.h.
AC_CHECK_TYPE([struct sched_param],
[HAVE_STRUCT_SCHED_PARAM=1], [],
[#include <pthread.h>])
;;
esac
fi
AC_SUBST([HAVE_STRUCT_SCHED_PARAM])
dnl Ensure the type pid_t gets defined.
AC_REQUIRE([AC_TYPE_PID_T])
dnl Check for declarations of anything we want to poison if the
dnl corresponding gnulib module is not in use, if it is not common
dnl enough to be declared everywhere.
gl_WARN_ON_USE_PREPARE([[#include <sched.h>
]], [sched_yield])
])
# gl_SCHED_MODULE_INDICATOR([modulename])
# sets the shell variable that indicates the presence of the given module
# to a C preprocessor expression that will evaluate to 1.
# This macro invocation must not occur in macros that are AC_REQUIREd.
AC_DEFUN([gl_SCHED_MODULE_INDICATOR],
[
dnl Ensure to expand the default settings once only.
gl_SCHED_H_REQUIRE_DEFAULTS
gl_MODULE_INDICATOR_SET_VARIABLE([$1])
dnl Define it also as a C macro, for the benefit of the unit tests.
gl_MODULE_INDICATOR_FOR_TESTS([$1])
])
# Initializes the default values for AC_SUBSTed shell variables.
# This macro must not be AC_REQUIREd. It must only be invoked, and only
# outside of macros or in macros that are not AC_REQUIREd.
AC_DEFUN([gl_SCHED_H_REQUIRE_DEFAULTS],
[
m4_defun(GL_MODULE_INDICATOR_PREFIX[_SCHED_H_MODULE_INDICATOR_DEFAULTS], [
gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SCHED_YIELD])
])
m4_require(GL_MODULE_INDICATOR_PREFIX[_SCHED_H_MODULE_INDICATOR_DEFAULTS])
AC_REQUIRE([gl_SCHED_H_DEFAULTS])
])
AC_DEFUN([gl_SCHED_H_DEFAULTS],
[
dnl Assume proper GNU behavior unless another module says otherwise.
HAVE_SCHED_YIELD=1; AC_SUBST([HAVE_SCHED_YIELD])
REPLACE_SCHED_YIELD=0; AC_SUBST([REPLACE_SCHED_YIELD])
])
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