| 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 | |
| 19 | #ifndef BIG_LOCK_H__ |
| 20 | #define BIG_LOCK_H__ |
| 21 | |
| 22 | /* |
| 23 | * acquire_big_lock - acquire global lock |
| 24 | * |
| 25 | * returns 0 to indicate lock acquired |
| 26 | * returns >0 to indicate lock was already held |
| 27 | * returns <0 to indicate failed to acquire lock |
| 28 | */ |
| 29 | extern int acquire_big_lock(int timeout_secs); |
| 30 | |
| 31 | /* |
| 32 | * release_big_lock - release global lock |
| 33 | * |
| 34 | * returns 0 if lock was released successfully |
| 35 | * returns -1 if lock had not been held before the call |
| 36 | */ |
| 37 | extern int release_big_lock(void); |
| 38 | |
| 39 | #endif /* BIG_LOCK_H__ */ |