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 */ 52