107 lines
3.2 KiB
Plaintext
107 lines
3.2 KiB
Plaintext
# sched_h.m4 serial 15
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dnl Copyright (C) 2008-2021 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl Written by Bruno Haible.
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AC_DEFUN_ONCE([gl_SCHED_H],
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[
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dnl Ensure to expand the default settings once only, before all statements
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dnl that occur in other macros.
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AC_REQUIRE([gl_SCHED_H_DEFAULTS])
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AC_REQUIRE([AC_CANONICAL_HOST])
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AC_CHECK_HEADERS_ONCE([sys/cdefs.h])
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AC_CHECK_HEADERS([sched.h], [], [],
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[[#if HAVE_SYS_CDEFS_H
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#include <sys/cdefs.h>
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#endif
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]])
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gl_NEXT_HEADERS([sched.h])
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if test "$ac_cv_header_sched_h" = yes; then
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HAVE_SCHED_H=1
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else
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HAVE_SCHED_H=0
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fi
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AC_SUBST([HAVE_SCHED_H])
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if test "$HAVE_SCHED_H" = 1; then
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AC_CHECK_TYPE([struct sched_param],
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[HAVE_STRUCT_SCHED_PARAM=1], [HAVE_STRUCT_SCHED_PARAM=0],
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[[#if HAVE_SYS_CDEFS_H
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#include <sys/cdefs.h>
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#endif
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#include <sched.h>
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]])
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else
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HAVE_STRUCT_SCHED_PARAM=0
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case "$host_os" in
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os2*)
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dnl On OS/2 kLIBC, struct sched_param is in spawn.h.
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AC_CHECK_TYPE([struct sched_param],
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[HAVE_STRUCT_SCHED_PARAM=1], [],
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[#include <spawn.h>])
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;;
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vms)
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dnl On OpenVMS 7.2 or newer, struct sched_param is in pthread.h.
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AC_CHECK_TYPE([struct sched_param],
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[HAVE_STRUCT_SCHED_PARAM=1], [],
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[#include <pthread.h>])
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;;
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esac
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fi
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AC_SUBST([HAVE_STRUCT_SCHED_PARAM])
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if test "$ac_cv_header_sys_cdefs_h" = yes; then
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HAVE_SYS_CDEFS_H=1
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else
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HAVE_SYS_CDEFS_H=0
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fi
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AC_SUBST([HAVE_SYS_CDEFS_H])
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dnl Ensure the type pid_t gets defined.
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AC_REQUIRE([AC_TYPE_PID_T])
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dnl Check for declarations of anything we want to poison if the
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dnl corresponding gnulib module is not in use, if it is not common
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dnl enough to be declared everywhere.
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gl_WARN_ON_USE_PREPARE([[#include <sched.h>
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]], [sched_yield])
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])
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# gl_SCHED_MODULE_INDICATOR([modulename])
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# sets the shell variable that indicates the presence of the given module
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# to a C preprocessor expression that will evaluate to 1.
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# This macro invocation must not occur in macros that are AC_REQUIREd.
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AC_DEFUN([gl_SCHED_MODULE_INDICATOR],
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[
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dnl Ensure to expand the default settings once only.
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gl_SCHED_H_REQUIRE_DEFAULTS
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gl_MODULE_INDICATOR_SET_VARIABLE([$1])
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dnl Define it also as a C macro, for the benefit of the unit tests.
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gl_MODULE_INDICATOR_FOR_TESTS([$1])
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])
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# Initializes the default values for AC_SUBSTed shell variables.
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# This macro must not be AC_REQUIREd. It must only be invoked, and only
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# outside of macros or in macros that are not AC_REQUIREd.
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AC_DEFUN([gl_SCHED_H_REQUIRE_DEFAULTS],
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[
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m4_defun(GL_MODULE_INDICATOR_PREFIX[_SCHED_H_MODULE_INDICATOR_DEFAULTS], [
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SCHED_YIELD])
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])
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m4_require(GL_MODULE_INDICATOR_PREFIX[_SCHED_H_MODULE_INDICATOR_DEFAULTS])
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AC_REQUIRE([gl_SCHED_H_DEFAULTS])
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])
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AC_DEFUN([gl_SCHED_H_DEFAULTS],
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[
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dnl Assume proper GNU behavior unless another module says otherwise.
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HAVE_SCHED_YIELD=1; AC_SUBST([HAVE_SCHED_YIELD])
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REPLACE_SCHED_YIELD=0; AC_SUBST([REPLACE_SCHED_YIELD])
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])
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