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# sched_h.m4 serial 15 |
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dnl Copyright (C) 2008-2023 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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