| David Hendricks | 4b832f5 | 2011-01-20 14:28:34 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010 Google Inc. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version 2 |
| 7 | * of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA |
| 17 | * |
| 18 | * locks.h: locks are used to preserve atomicity of operations. |
| 19 | */ |
| 20 | |
| 21 | #ifndef LOCKS_H__ |
| 22 | #define LOCKS_H__ |
| 23 | |
| 24 | /* this is the base key, since we have to pick something global */ |
| 25 | #define IPC_LOCK_KEY (0x67736c00 & 0xfffffc00) /* 22 bits "gsl" */ |
| 26 | |
| 27 | /* The ordering of the following keys matters a lot. We don't want to reorder |
| 28 | * keys and have a new binary dependent on deployed/used because it will break |
| 29 | * atomicity of existing users and binaries. In other words, DO NOT REORDER. */ |
| 30 | |
| 31 | /* this is the "big lock". */ |
| 32 | #define BIGLOCK (IPC_LOCK_KEY + 0) |
| 33 | |
| 34 | #endif /* LOCKS_H__ */ |