# sched_h.m4 serial 12

dnl Copyright (C) 2008-2020 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([gl_SCHED_H],

[

  dnl Use AC_REQUIRE here, so that the default behavior below is expanded

  dnl once only, before all statements 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])

])

AC_DEFUN([gl_SCHED_MODULE_INDICATOR],

[

  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.

  AC_REQUIRE([gl_SCHED_H_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])

])

AC_DEFUN([gl_SCHED_H_DEFAULTS],

[

  GNULIB_SCHED_YIELD=0;  AC_SUBST([GNULIB_SCHED_YIELD])

  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])

])