| 1 | # gethrxtime.m4 serial 2
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| 2 | dnl Copyright (C) 2005 Free Software Foundation, Inc.
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| 3 | dnl This file is free software; the Free Software Foundation
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| 4 | dnl gives unlimited permission to copy and/or distribute it,
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| 5 | dnl with or without modifications, as long as this notice is preserved.
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| 6 |
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| 7 | dnl Written by Paul Eggert.
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| 8 |
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| 9 | AC_DEFUN([gl_GETHRXTIME],
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| 10 | [
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| 11 | AC_LIBSOURCES([gethrxtime.c, gethrxtime.h, xtime.h])
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| 12 | AC_REQUIRE([gl_ARITHMETIC_HRTIME_T])
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| 13 | AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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| 14 | AC_REQUIRE([gl_XTIME])
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| 15 | AC_CHECK_DECLS([gethrtime], [], [], [#include <time.h>])
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| 16 | case $ac_cv_have_decl_gethrtime,$gl_cv_arithmetic_hrtime_t in
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| 17 | yes,yes) ;;
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| 18 | *)
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| 19 | AC_LIBOBJ([gethrxtime])
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| 20 | gl_PREREQ_GETHRXTIME;;
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| 21 | esac
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| 22 | ])
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| 23 |
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| 24 | # Test whether hrtime_t is an arithmetic type.
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| 25 | # It is not arithmetic in older Solaris c89 (which insists on
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| 26 | # not having a long long int type).
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| 27 | AC_DEFUN([gl_ARITHMETIC_HRTIME_T],
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| 28 | [
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| 29 | AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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| 30 | AC_CACHE_CHECK([for arithmetic hrtime_t], gl_cv_arithmetic_hrtime_t,
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| 31 | [AC_COMPILE_IFELSE(
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| 32 | [AC_LANG_PROGRAM([#include <time.h>],
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| 33 | [hrtime_t x = 0; return x/x;])],
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| 34 | [gl_cv_arithmetic_hrtime_t=yes],
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| 35 | [gl_cv_arithmetic_hrtime_t=no])])
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| 36 | if test $gl_cv_arithmetic_hrtime_t = yes; then
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| 37 | AC_DEFINE([HAVE_ARITHMETIC_HRTIME_T], 1,
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| 38 | [Define if you have an arithmetic hrtime_t type.])
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| 39 | fi
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| 40 | ])
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| 41 |
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| 42 | # Prerequisites of lib/xtime.h.
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| 43 | AC_DEFUN([gl_XTIME],
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| 44 | [
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| 45 | AC_REQUIRE([AC_C_INLINE])
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| 46 | AC_REQUIRE([gl_AC_TYPE_LONG_LONG])
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| 47 | :
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| 48 | ])
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| 49 |
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| 50 | # Prerequisites of lib/gethrxtime.c.
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| 51 | AC_DEFUN([gl_PREREQ_GETHRXTIME],
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| 52 | [
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| 53 | AC_REQUIRE([AC_HEADER_TIME])
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| 54 | AC_REQUIRE([gl_CLOCK_TIME])
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| 55 | AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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| 56 | AC_CHECK_FUNCS_ONCE(gettimeofday microuptime nanouptime)
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| 57 |
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| 58 | if test $ac_cv_func_nanouptime != yes; then
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| 59 | LIB_GETHRXTIME=
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| 60 | AC_CACHE_CHECK([whether CLOCK_MONOTONIC is defined],
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| 61 | gl_cv_have_CLOCK_MONOTONIC,
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| 62 | [AC_EGREP_CPP([have_CLOCK_MONOTONIC],
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| 63 | [
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| 64 | # include <time.h>
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| 65 | # ifdef CLOCK_MONOTONIC
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| 66 | have_CLOCK_MONOTONIC
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| 67 | # endif
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| 68 | ],
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| 69 | gl_cv_have_CLOCK_MONOTONIC=yes,
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| 70 | gl_cv_have_CLOCK_MONOTONIC=no)])
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| 71 | if test $gl_cv_have_CLOCK_MONOTONIC = yes; then
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| 72 | LIB_GETHRXTIME=$LIB_CLOCK_GETTIME
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| 73 | fi
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| 74 | AC_SUBST([LIB_GETHRXTIME])
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| 75 | fi
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| 76 | ])
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