| 1 | # sched_h.m4 serial 15
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| 2 | dnl Copyright (C) 2008-2022 Free Software Foundation, Inc.
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| 3 | dnl This file is free software; the Free Software Foundation
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| 4 | dnl gives unlimited permission to copy and/or distribute it,
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| 5 | dnl with or without modifications, as long as this notice is preserved.
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| 6 |
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| 7 | dnl Written by Bruno Haible.
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| 8 |
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| 9 | AC_DEFUN_ONCE([gl_SCHED_H],
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| 10 | [
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| 11 | dnl Ensure to expand the default settings once only, before all statements
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| 12 | dnl that occur in other macros.
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| 13 | AC_REQUIRE([gl_SCHED_H_DEFAULTS])
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| 14 |
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| 15 | AC_REQUIRE([AC_CANONICAL_HOST])
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| 16 |
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| 17 | AC_CHECK_HEADERS_ONCE([sys/cdefs.h])
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| 18 | AC_CHECK_HEADERS([sched.h], [], [],
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| 19 | [[#if HAVE_SYS_CDEFS_H
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| 20 | #include <sys/cdefs.h>
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| 21 | #endif
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| 22 | ]])
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| 23 | gl_NEXT_HEADERS([sched.h])
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| 24 |
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| 25 | if test "$ac_cv_header_sched_h" = yes; then
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| 26 | HAVE_SCHED_H=1
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| 27 | else
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| 28 | HAVE_SCHED_H=0
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| 29 | fi
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| 30 | AC_SUBST([HAVE_SCHED_H])
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| 31 |
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| 32 | if test "$HAVE_SCHED_H" = 1; then
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| 33 | AC_CHECK_TYPE([struct sched_param],
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| 34 | [HAVE_STRUCT_SCHED_PARAM=1], [HAVE_STRUCT_SCHED_PARAM=0],
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| 35 | [[#if HAVE_SYS_CDEFS_H
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| 36 | #include <sys/cdefs.h>
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| 37 | #endif
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| 38 | #include <sched.h>
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| 39 | ]])
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| 40 | else
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| 41 | HAVE_STRUCT_SCHED_PARAM=0
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| 42 | case "$host_os" in
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| 43 | os2*)
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| 44 | dnl On OS/2 kLIBC, struct sched_param is in spawn.h.
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| 45 | AC_CHECK_TYPE([struct sched_param],
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| 46 | [HAVE_STRUCT_SCHED_PARAM=1], [],
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| 47 | [#include <spawn.h>])
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| 48 | ;;
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| 49 | vms)
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| 50 | dnl On OpenVMS 7.2 or newer, struct sched_param is in pthread.h.
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| 51 | AC_CHECK_TYPE([struct sched_param],
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| 52 | [HAVE_STRUCT_SCHED_PARAM=1], [],
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| 53 | [#include <pthread.h>])
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| 54 | ;;
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| 55 | esac
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| 56 | fi
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| 57 | AC_SUBST([HAVE_STRUCT_SCHED_PARAM])
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| 58 |
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| 59 | if test "$ac_cv_header_sys_cdefs_h" = yes; then
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| 60 | HAVE_SYS_CDEFS_H=1
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| 61 | else
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| 62 | HAVE_SYS_CDEFS_H=0
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| 63 | fi
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| 64 | AC_SUBST([HAVE_SYS_CDEFS_H])
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| 65 |
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| 66 | dnl Ensure the type pid_t gets defined.
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| 67 | AC_REQUIRE([AC_TYPE_PID_T])
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| 68 |
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| 69 | dnl Check for declarations of anything we want to poison if the
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| 70 | dnl corresponding gnulib module is not in use, if it is not common
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| 71 | dnl enough to be declared everywhere.
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| 72 | gl_WARN_ON_USE_PREPARE([[#include <sched.h>
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| 73 | ]], [sched_yield])
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| 74 | ])
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| 75 |
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| 76 | # gl_SCHED_MODULE_INDICATOR([modulename])
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| 77 | # sets the shell variable that indicates the presence of the given module
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| 78 | # to a C preprocessor expression that will evaluate to 1.
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| 79 | # This macro invocation must not occur in macros that are AC_REQUIREd.
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| 80 | AC_DEFUN([gl_SCHED_MODULE_INDICATOR],
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| 81 | [
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| 82 | dnl Ensure to expand the default settings once only.
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| 83 | gl_SCHED_H_REQUIRE_DEFAULTS
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| 84 | gl_MODULE_INDICATOR_SET_VARIABLE([$1])
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| 85 | dnl Define it also as a C macro, for the benefit of the unit tests.
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| 86 | gl_MODULE_INDICATOR_FOR_TESTS([$1])
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| 87 | ])
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| 88 |
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| 89 | # Initializes the default values for AC_SUBSTed shell variables.
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| 90 | # This macro must not be AC_REQUIREd. It must only be invoked, and only
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| 91 | # outside of macros or in macros that are not AC_REQUIREd.
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| 92 | AC_DEFUN([gl_SCHED_H_REQUIRE_DEFAULTS],
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| 93 | [
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| 94 | m4_defun(GL_MODULE_INDICATOR_PREFIX[_SCHED_H_MODULE_INDICATOR_DEFAULTS], [
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| 95 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_SCHED_YIELD])
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| 96 | ])
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| 97 | m4_require(GL_MODULE_INDICATOR_PREFIX[_SCHED_H_MODULE_INDICATOR_DEFAULTS])
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| 98 | AC_REQUIRE([gl_SCHED_H_DEFAULTS])
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| 99 | ])
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| 100 |
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| 101 | AC_DEFUN([gl_SCHED_H_DEFAULTS],
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| 102 | [
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| 103 | dnl Assume proper GNU behavior unless another module says otherwise.
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| 104 | HAVE_SCHED_YIELD=1; AC_SUBST([HAVE_SCHED_YIELD])
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| 105 | REPLACE_SCHED_YIELD=0; AC_SUBST([REPLACE_SCHED_YIELD])
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| 106 | ])
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