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1/* low level locking for pthread library. Generic futex-using version.
2 Copyright (C) 2003-2019 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <http://www.gnu.org/licenses/>. */
19
20#include <errno.h>
21#include <sysdep.h>
22#include <lowlevellock.h>
23#include <sys/time.h>
24#include <atomic.h>
25
26void
27__lll_lock_wait_private (int *futex)
28{
29 if (*futex == 2)
30 lll_futex_wait (futex, 2, LLL_PRIVATE); /* Wait if *futex == 2. */
31
32 while (atomic_exchange_acq (futex, 2) != 0)
33 lll_futex_wait (futex, 2, LLL_PRIVATE); /* Wait if *futex == 2. */
34}
35
36
37/* This function doesn't get included in libc. */
38#if IS_IN (libpthread)
39void
40__lll_lock_wait (int *futex, int private)
41{
42 if (*futex == 2)
43 lll_futex_wait (futex, 2, private); /* Wait if *futex == 2. */
44
45 while (atomic_exchange_acq (futex, 2) != 0)
46 lll_futex_wait (futex, 2, private); /* Wait if *futex == 2. */
47}
48#endif
49

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