mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 13:00:06 +00:00
688903eb3e
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
/* Timed low level locking for pthread library. Generic futex-using version.
|
|
Copyright (C) 2003-2018 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.
|
|
|
|
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
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <atomic.h>
|
|
#include <errno.h>
|
|
#include <lowlevellock.h>
|
|
#include <sys/time.h>
|
|
|
|
|
|
int
|
|
__lll_timedlock_wait (int *futex, const struct timespec *abstime, int private)
|
|
{
|
|
/* Reject invalid timeouts. */
|
|
if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000)
|
|
return EINVAL;
|
|
|
|
/* Try locking. */
|
|
while (atomic_exchange_acq (futex, 2) != 0)
|
|
{
|
|
struct timeval tv;
|
|
|
|
/* Get the current time. */
|
|
(void) __gettimeofday (&tv, NULL);
|
|
|
|
/* Compute relative timeout. */
|
|
struct timespec rt;
|
|
rt.tv_sec = abstime->tv_sec - tv.tv_sec;
|
|
rt.tv_nsec = abstime->tv_nsec - tv.tv_usec * 1000;
|
|
if (rt.tv_nsec < 0)
|
|
{
|
|
rt.tv_nsec += 1000000000;
|
|
--rt.tv_sec;
|
|
}
|
|
|
|
if (rt.tv_sec < 0)
|
|
return ETIMEDOUT;
|
|
|
|
/* If *futex == 2, wait until woken or timeout. */
|
|
lll_futex_timed_wait (futex, 2, &rt, private);
|
|
}
|
|
|
|
return 0;
|
|
}
|