mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-15 09:30:06 +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.
49 lines
1.6 KiB
C
49 lines
1.6 KiB
C
/* 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 <errno.h>
|
|
#include <sysdep.h>
|
|
#include <lowlevellock.h>
|
|
#include <sys/time.h>
|
|
#include <atomic.h>
|
|
|
|
void
|
|
__lll_lock_wait_private (int *futex)
|
|
{
|
|
if (*futex == 2)
|
|
lll_futex_wait (futex, 2, LLL_PRIVATE); /* Wait if *futex == 2. */
|
|
|
|
while (atomic_exchange_acq (futex, 2) != 0)
|
|
lll_futex_wait (futex, 2, LLL_PRIVATE); /* Wait if *futex == 2. */
|
|
}
|
|
|
|
|
|
/* This function doesn't get included in libc. */
|
|
#if IS_IN (libpthread)
|
|
void
|
|
__lll_lock_wait (int *futex, int private)
|
|
{
|
|
if (*futex == 2)
|
|
lll_futex_wait (futex, 2, private); /* Wait if *futex == 2. */
|
|
|
|
while (atomic_exchange_acq (futex, 2) != 0)
|
|
lll_futex_wait (futex, 2, private); /* Wait if *futex == 2. */
|
|
}
|
|
#endif
|