-# sched_h.m4 serial 1
-dnl Copyright (C) 2008 Free Software Foundation, Inc.
+# sched_h.m4 serial 6
+dnl Copyright (C) 2008-2011 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.
AC_DEFUN([gl_SCHED_H],
[
- AC_CHECK_HEADERS_ONCE([sched.h])
- if test $ac_cv_header_sched_h = yes; then
- SCHED_H=''
- else
- SCHED_H='sched.h'
- fi
+ AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM([[
+ #include <sched.h>
+ struct sched_param a;
+ int b[] = { SCHED_FIFO, SCHED_RR, SCHED_OTHER };
+ pid_t t1;
+ ]])],
+ [SCHED_H=''],
+ [SCHED_H='sched.h'
+
+ gl_CHECK_NEXT_HEADERS([sched.h])
+
+ if test $ac_cv_header_sched_h = yes; then
+ HAVE_SCHED_H=1
+ else
+ HAVE_SCHED_H=0
+ fi
+ AC_SUBST([HAVE_SCHED_H])
+
+ AC_CHECK_TYPE([struct sched_param],
+ [HAVE_STRUCT_SCHED_PARAM=1], [HAVE_STRUCT_SCHED_PARAM=0],
+ [#include <sched.h>])
+ AC_SUBST([HAVE_STRUCT_SCHED_PARAM])
+
+ dnl Ensure the type pid_t gets defined.
+ AC_REQUIRE([AC_TYPE_PID_T])
+ ])
AC_SUBST([SCHED_H])
+ AM_CONDITIONAL([GL_GENERATE_SCHED_H], [test -n "$SCHED_H"])
])