| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 1 | /* Low-level lock implementation. NaCl version. |
| 2 | Copyright (C) 2015-2016 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | |
| 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. |
| 9 | |
| 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. |
| 14 | |
| 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/>. */ |
| 18 | |
| 19 | #ifndef _LOWLEVELLOCK_H |
| 20 | |
| 21 | /* Everything except the exit handling is the same as the generic code. */ |
| 22 | # include <sysdeps/nptl/lowlevellock.h> |
| 23 | |
| 24 | /* See exit-thread.h for details. */ |
| 25 | # define NACL_EXITING_TID 1 |
| 26 | |
| 27 | # undef lll_wait_tid |
| 28 | # define lll_wait_tid(tid) \ |
| 29 | do { \ |
| 30 | __typeof (tid) __tid; \ |
| 31 | volatile __typeof (tid) *__tidp = &(tid); \ |
| 32 | while ((__tid = atomic_load_relaxed (__tidp)) != 0) \ |
| 33 | { \ |
| 34 | if (__tid == NACL_EXITING_TID) \ |
| 35 | atomic_spin_nop (); \ |
| 36 | else \ |
| 37 | lll_futex_wait (__tidp, __tid, LLL_PRIVATE); \ |
| 38 | } \ |
| 39 | } while (0) |
| 40 | |
| 41 | #endif /* lowlevellock.h */ |