| /* 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 */ |