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[PATCH 1/5] gettime: port better to non-POSIX C2x
From: |
Paul Eggert |
Subject: |
[PATCH 1/5] gettime: port better to non-POSIX C2x |
Date: |
Tue, 28 Dec 2021 12:05:10 -0800 |
C2x requires a function timespec_get; prefer that to
gettimeofday, since it has better resolution.
* lib/gettime.c (gettime): Prefer timespec_get to gettimeofday.
* m4/gettime.m4 (gl_GETTIME): Check for timespec_get.
Omit a check for gettimeofday; not needed because
the gettime module depends on the gettimeofday module.
---
ChangeLog | 10 ++++++++++
lib/gettime.c | 2 ++
m4/gettime.m4 | 4 ++--
3 files changed, 14 insertions(+), 2 deletions(-)
diff --git a/ChangeLog b/ChangeLog
index 5bbedae84..23c87e8e1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,13 @@
+2021-12-28 Paul Eggert <eggert@cs.ucla.edu>
+
+ gettime: port better to non-POSIX C2x
+ C2x requires a function timespec_get; prefer that to
+ gettimeofday, since it has better resolution.
+ * lib/gettime.c (gettime): Prefer timespec_get to gettimeofday.
+ * m4/gettime.m4 (gl_GETTIME): Check for timespec_get.
+ Omit a check for gettimeofday; not needed because
+ the gettime module depends on the gettimeofday module.
+
2021-12-28 Bruno Haible <bruno@clisp.org>
gen-uni-tables: Produce license notices suitable for Gnulib.
diff --git a/lib/gettime.c b/lib/gettime.c
index 8f28a32df..87f9347e0 100644
--- a/lib/gettime.c
+++ b/lib/gettime.c
@@ -30,6 +30,8 @@ gettime (struct timespec *ts)
{
#if defined CLOCK_REALTIME && HAVE_CLOCK_GETTIME
clock_gettime (CLOCK_REALTIME, ts);
+#elif defined HAVE_TIMESPEC_GET
+ timespec_get (ts, TIME_UTC);
#else
struct timeval tv;
gettimeofday (&tv, NULL);
diff --git a/m4/gettime.m4 b/m4/gettime.m4
index de7c33046..cb58bc8eb 100644
--- a/m4/gettime.m4
+++ b/m4/gettime.m4
@@ -1,4 +1,4 @@
-# gettime.m4 serial 9
+# gettime.m4 serial 10
dnl Copyright (C) 2002, 2004-2006, 2009-2021 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -9,5 +9,5 @@ AC_DEFUN([gl_GETTIME],
dnl Prerequisites of lib/gettime.c.
AC_REQUIRE([gl_CLOCK_TIME])
AC_REQUIRE([gl_TIMESPEC])
- AC_CHECK_FUNCS_ONCE([gettimeofday])
+ AC_CHECK_FUNCS_ONCE([timespec_get])
])
--
2.33.1
- [PATCH 1/5] gettime: port better to non-POSIX C2x,
Paul Eggert <=
- [PATCH 5/5] clock_getres: document portability issues better, Paul Eggert, 2021/12/28
- [PATCH 4/5] timespec_getres: new module, Paul Eggert, 2021/12/28
- [PATCH 2/5] clock_gettime: improve doc, Paul Eggert, 2021/12/28
- [PATCH 3/5] gettime-res: new module, Paul Eggert, 2021/12/28
- Re: [PATCH 1/5] gettime: port better to non-POSIX C2x, Bruno Haible, 2021/12/28