+# gethrxtime.m4 serial 2
+dnl Copyright (C) 2005 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 Paul Eggert.
+
+AC_DEFUN([gl_GETHRXTIME],
+[
+ AC_LIBSOURCES([gethrxtime.c, gethrxtime.h, xtime.h])
+ AC_REQUIRE([gl_ARITHMETIC_HRTIME_T])
+ AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+ AC_REQUIRE([gl_XTIME])
+ AC_CHECK_DECLS([gethrtime], [], [], [#include <time.h>])
+ case $ac_cv_have_decl_gethrtime,$gl_cv_arithmetic_hrtime_t in
+ yes,yes) ;;
+ *)
+ AC_LIBOBJ([gethrxtime])
+ gl_PREREQ_GETHRXTIME;;
+ esac
+])
+
+# Test whether hrtime_t is an arithmetic type.
+# It is not arithmetic in older Solaris c89 (which insists on
+# not having a long long int type).
+AC_DEFUN([gl_ARITHMETIC_HRTIME_T],
+[
+ AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+ AC_CACHE_CHECK([for arithmetic hrtime_t], gl_cv_arithmetic_hrtime_t,
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM([#include <time.h>],
+ [hrtime_t x = 0; return x/x;])],
+ [gl_cv_arithmetic_hrtime_t=yes],
+ [gl_cv_arithmetic_hrtime_t=no])])
+ if test $gl_cv_arithmetic_hrtime_t = yes; then
+ AC_DEFINE([HAVE_ARITHMETIC_HRTIME_T], 1,
+ [Define if you have an arithmetic hrtime_t type.])
+ fi
+])
+
+# Prerequisites of lib/xtime.h.
+AC_DEFUN([gl_XTIME],
+[
+ AC_REQUIRE([AC_C_INLINE])
+ AC_REQUIRE([gl_AC_TYPE_LONG_LONG])
+ :
+])
+
+# Prerequisites of lib/gethrxtime.c.
+AC_DEFUN([gl_PREREQ_GETHRXTIME],
+[
+ AC_REQUIRE([AC_HEADER_TIME])
+ AC_REQUIRE([gl_CLOCK_TIME])
+ AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+ AC_CHECK_FUNCS_ONCE(gettimeofday microuptime nanouptime)
+
+ if test $ac_cv_func_nanouptime != yes; then
+ LIB_GETHRXTIME=
+ AC_CACHE_CHECK([whether CLOCK_MONOTONIC is defined],
+ gl_cv_have_CLOCK_MONOTONIC,
+ [AC_EGREP_CPP([have_CLOCK_MONOTONIC],
+ [
+# include <time.h>
+# ifdef CLOCK_MONOTONIC
+ have_CLOCK_MONOTONIC
+# endif
+ ],
+ gl_cv_have_CLOCK_MONOTONIC=yes,
+ gl_cv_have_CLOCK_MONOTONIC=no)])
+ if test $gl_cv_have_CLOCK_MONOTONIC = yes; then
+ LIB_GETHRXTIME=$LIB_CLOCK_GETTIME
+ fi
+ AC_SUBST([LIB_GETHRXTIME])
+ fi
+])