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/* Low-level lock implementation. NaCl version.
Copyright (C) 2015-2016 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
<http://www.gnu.org/licenses/>. */
#ifndef _LOWLEVELLOCK_H
/* Everything except the exit handling is the same as the generic code. */
# include <sysdeps/nptl/lowlevellock.h>
/* See exit-thread.h for details. */
# define NACL_EXITING_TID 1
# undef lll_wait_tid
# define lll_wait_tid(tid) \
do { \
__typeof (tid) __tid; \
volatile __typeof (tid) *__tidp = &(tid); \
while ((__tid = atomic_load_relaxed (__tidp)) != 0) \
{ \
if (__tid == NACL_EXITING_TID) \
atomic_spin_nop (); \
else \
lll_futex_wait (__tidp, __tid, LLL_PRIVATE); \
} \
} while (0)
#endif /* lowlevellock.h */
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