1 /* Timed low level locking for pthread library. NaCl version.
2 Copyright (C) 2015 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
22 #include <lowlevellock.h>
26 /* This behaves the same as the generic version in nptl/. It's simpler
27 because it doesn't need to convert an absolute timeout to a relative
28 one (and back again in the lll_futex_timed_wait macro). */
31 __lll_timedlock_wait (int *futex
, const struct timespec
*abstime
, int private)
33 /* Reject invalid timeouts. */
34 if (__glibc_unlikely (abstime
->tv_nsec
< 0)
35 || __glibc_unlikely (abstime
->tv_nsec
>= 1000000000))
39 while (atomic_exchange_acq (futex
, 2) != 0)
41 /* If *futex == 2, wait until woken or timeout. */
42 int err
= __nacl_irt_futex
.futex_wait_abs ((volatile int *) futex
, 2,
46 if (__glibc_likely (err
== ETIMEDOUT
))
48 assert (err
== EAGAIN
);