| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) International Business Machines Corp., 2000-2001 |
| 3 | * Portions Copyright (c) Christoph Hellwig, 2001-2002 |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program 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 |
| 13 | * the GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 | */ |
| 19 | #ifndef _H_JFS_LOCK |
| 20 | #define _H_JFS_LOCK |
| 21 | |
| 22 | #include <linux/spinlock.h> |
| 23 | #include <linux/sched.h> |
| 24 | |
| 25 | /* |
| 26 | * jfs_lock.h |
| 27 | */ |
| 28 | |
| 29 | /* |
| 30 | * Conditional sleep where condition is protected by spinlock |
| 31 | * |
| 32 | * lock_cmd and unlock_cmd take and release the spinlock |
| 33 | */ |
| 34 | #define __SLEEP_COND(wq, cond, lock_cmd, unlock_cmd) \ |
| 35 | do { \ |
| 36 | DECLARE_WAITQUEUE(__wait, current); \ |
| 37 | \ |
| 38 | add_wait_queue(&wq, &__wait); \ |
| 39 | for (;;) { \ |
| 40 | set_current_state(TASK_UNINTERRUPTIBLE);\ |
| 41 | if (cond) \ |
| 42 | break; \ |
| 43 | unlock_cmd; \ |
| 44 | schedule(); \ |
| 45 | lock_cmd; \ |
| 46 | } \ |
| 47 | current->state = TASK_RUNNING; \ |
| 48 | remove_wait_queue(&wq, &__wait); \ |
| 49 | } while (0) |
| 50 | |
| 51 | #endif /* _H_JFS_LOCK */ |