m4/sched_h.m4

   1 # sched_h.m4 serial 9
   2 dnl Copyright (C) 2008-2017 Free Software Foundation, Inc.
   3 dnl This file is free software; the Free Software Foundation
   4 dnl gives unlimited permission to copy and/or distribute it,
   5 dnl with or without modifications, as long as this notice is preserved.
   6
   7 dnl Written by Bruno Haible.
   8
   9 AC_DEFUN([gl_SCHED_H],
  10 [
  11   AC_CHECK_HEADERS_ONCE([sys/cdefs.h])
  12   AC_COMPILE_IFELSE(
  13     [AC_LANG_PROGRAM([[
  14        #include <sched.h>
  15        struct sched_param a;
  16        int b[] = { SCHED_FIFO, SCHED_RR, SCHED_OTHER };
  17        pid_t t1;
  18      ]])],
  19     [SCHED_H=''],
  20     [SCHED_H='sched.h'
  21      AC_CHECK_HEADERS([sched.h], [], [],
  22        [[#if HAVE_SYS_CDEFS_H
  23           #include <sys/cdefs.h>
  24          #endif
  25        ]])
  26      gl_NEXT_HEADERS([sched.h])
  27
  28      if test "$ac_cv_header_sched_h" = yes; then
  29        HAVE_SCHED_H=1
  30      else
  31        HAVE_SCHED_H=0
  32      fi
  33      AC_SUBST([HAVE_SCHED_H])
  34
  35      if test "$HAVE_SCHED_H" = 1; then
  36        AC_CHECK_TYPE([struct sched_param],
  37          [HAVE_STRUCT_SCHED_PARAM=1], [HAVE_STRUCT_SCHED_PARAM=0],
  38          [[#if HAVE_SYS_CDEFS_H
  39             #include <sys/cdefs.h>
  40            #endif
  41            #include <sched.h>
  42          ]])
  43      else
  44        dnl On OS/2 kLIBC, struct sched_param is in spawn.h.
  45        AC_CHECK_TYPE([struct sched_param],
  46          [HAVE_STRUCT_SCHED_PARAM=1], [HAVE_STRUCT_SCHED_PARAM=0],
  47          [#include <spawn.h>])
  48      fi
  49      AC_SUBST([HAVE_STRUCT_SCHED_PARAM])
  50
  51      if test "$ac_cv_header_sys_cdefs_h" = yes; then
  52        HAVE_SYS_CDEFS_H=1
  53      else
  54        HAVE_SYS_CDEFS_H=0
  55      fi
  56      AC_SUBST([HAVE_SYS_CDEFS_H])
  57
  58      dnl Ensure the type pid_t gets defined.
  59      AC_REQUIRE([AC_TYPE_PID_T])
  60     ])
  61   AC_SUBST([SCHED_H])
  62   AM_CONDITIONAL([GL_GENERATE_SCHED_H], [test -n "$SCHED_H"])
  63 ])