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-rw-r--r--m4/sched_h.m4106
1 files changed, 106 insertions, 0 deletions
diff --git a/m4/sched_h.m4 b/m4/sched_h.m4
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+++ b/m4/sched_h.m4
@@ -0,0 +1,106 @@
+# sched_h.m4 serial 15
+dnl Copyright (C) 2008-2022 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_CHECK_HEADERS_ONCE([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 "$host_os" in
+ os2*)
+ dnl On OS/2 kLIBC, struct sched_param is in spawn.h.
+ AC_CHECK_TYPE([struct sched_param],
+ [HAVE_STRUCT_SCHED_PARAM=1], [],
+ [#include <spawn.h>])
+ ;;
+ vms)
+ dnl On OpenVMS 7.2 or newer, struct sched_param is in pthread.h.
+ AC_CHECK_TYPE([struct sched_param],
+ [HAVE_STRUCT_SCHED_PARAM=1], [],
+ [#include <pthread.h>])
+ ;;
+ esac
+ fi
+ AC_SUBST([HAVE_STRUCT_SCHED_PARAM])
+
+ if test "$ac_cv_header_sys_cdefs_h" = yes; then
+ HAVE_SYS_CDEFS_H=1
+ else
+ HAVE_SYS_CDEFS_H=0
+ fi
+ AC_SUBST([HAVE_SYS_CDEFS_H])
+
+ 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])
+])