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Use clock_gettime to implement timespec_get.

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timespec_get is the same function as clock_gettime, with an obnoxious
coating of NIH painted on it by the ISO C committee.  In addition to
the rename, it takes its arguments in a different order, it returns 0
on *failure* or a positive number on *success*, and it requires that
all of its TIME_* constants be positive.  This last means we cannot
directly reuse the existing CLOCK_* constants for it, because
those have been allocated starting with CLOCK_REALTIME = 0 on all
existing platforms.

This patch simply promotes the sysdeps/posix implementation to
universal, and removes the Linux-specific implementation, whose
apparent reason for existing was to cut out one function call's worth
of overhead.

Checked on x86_64-linux-gnu, i686-linux-gnu, powerpc64le-linux-gnu,
powerpc64-linux-gnu, powerpc-linux-gnu, and aarch64-linux-gnu.

Reviewed-by: Lukasz Majewski <lukma@denx.de>
This commit is contained in:
Zack Weinberg 2019-08-22 17:10:35 -04:00 committed by Adhemerval Zanella
parent 2b5fea833b
commit 40a36935ff
3 changed files with 4 additions and 88 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
sysdeps/posix/timespec_get.c
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@ -1,32 +0,0 @@
/* timespec_get -- C11 interface to sample a clock. Generic POSIX.1 version.
Copyright (C) 2013-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <time.h>
/* Set TS to calendar time based in time base BASE. */
int
timespec_get (struct timespec *ts, int base)
{
if (base == TIME_UTC)
{
__clock_gettime (CLOCK_REALTIME, ts);
return base;
}
return 0;
}

46
sysdeps/unix/sysv/linux/timespec_get.c
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@ -1,46 +0,0 @@
/* Copyright (C) 2011-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <time.h>
#include <sysdep.h>
#include <errno.h>
#ifdef HAVE_CLOCK_GETTIME_VSYSCALL
# define HAVE_VSYSCALL
#endif
#include <sysdep-vdso.h>
/* Set TS to calendar time based in time base BASE. */
int
timespec_get (struct timespec *ts, int base)
{
switch (base)
{
int res;
INTERNAL_SYSCALL_DECL (err);
case TIME_UTC:
res = INTERNAL_VSYSCALL (clock_gettime, err, 2, CLOCK_REALTIME, ts);
if (INTERNAL_SYSCALL_ERROR_P (res, err))
return 0;
break;
default:
return 0;
}
return base;
}

14
time/timespec_get.c
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@ -22,16 +22,10 @@
int
timespec_get (struct timespec *ts, int base)
{
switch (base)
if (base == TIME_UTC)
{
case TIME_UTC:
/* Not supported. */
return 0;
default:
return 0;
__clock_gettime (CLOCK_REALTIME, ts);
return base;
}
return base;
return 0;
}
stub_warning (timespec_get)