| David Hendricks | e15ca3c | 2012-08-09 11:05:20 -0700 | [diff] [blame] | 1 | /* Copyright 2012, Google Inc. |
| 2 | * All rights reserved. |
| David Hendricks | 4b832f5 | 2011-01-20 14:28:34 -0800 | [diff] [blame] | 3 | * |
| David Hendricks | e15ca3c | 2012-08-09 11:05:20 -0700 | [diff] [blame] | 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that the following conditions are |
| 6 | * met: |
| David Hendricks | 4b832f5 | 2011-01-20 14:28:34 -0800 | [diff] [blame] | 7 | * |
| David Hendricks | e15ca3c | 2012-08-09 11:05:20 -0700 | [diff] [blame] | 8 | * * Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * * Redistributions in binary form must reproduce the above |
| 11 | * copyright notice, this list of conditions and the following |
| 12 | * disclaimer in the documentation and/or other materials provided |
| 13 | * with the distribution. |
| 14 | * * Neither the name of Google Inc. nor the names of its |
| 15 | * contributors may be used to endorse or promote products derived |
| 16 | * from this software without specific prior written permission. |
| David Hendricks | 4b832f5 | 2011-01-20 14:28:34 -0800 | [diff] [blame] | 17 | * |
| David Hendricks | e15ca3c | 2012-08-09 11:05:20 -0700 | [diff] [blame] | 18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 19 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 20 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 21 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 22 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 23 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 24 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 25 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 26 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 27 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 28 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| David Hendricks | 4b832f5 | 2011-01-20 14:28:34 -0800 | [diff] [blame] | 29 | */ |
| 30 | |
| 31 | #ifndef BIG_LOCK_H__ |
| 32 | #define BIG_LOCK_H__ |
| 33 | |
| 34 | /* |
| 35 | * acquire_big_lock - acquire global lock |
| 36 | * |
| 37 | * returns 0 to indicate lock acquired |
| 38 | * returns >0 to indicate lock was already held |
| 39 | * returns <0 to indicate failed to acquire lock |
| 40 | */ |
| 41 | extern int acquire_big_lock(int timeout_secs); |
| 42 | |
| 43 | /* |
| 44 | * release_big_lock - release global lock |
| 45 | * |
| 46 | * returns 0 if lock was released successfully |
| 47 | * returns -1 if lock had not been held before the call |
| 48 | */ |
| 49 | extern int release_big_lock(void); |
| 50 | |
| 51 | #endif /* BIG_LOCK_H__ */ |