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Diffstat (limited to 'fs/jfs/jfs_lock.h')
| -rw-r--r-- | fs/jfs/jfs_lock.h | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/fs/jfs/jfs_lock.h b/fs/jfs/jfs_lock.h new file mode 100644 index 000000000000..10ad1d086685 --- /dev/null +++ b/fs/jfs/jfs_lock.h @@ -0,0 +1,51 @@ +/* + * Copyright (c) International Business Machines Corp., 2000-2001 + * Portions Copyright (c) Christoph Hellwig, 2001-2002 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See + * the GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +#ifndef _H_JFS_LOCK +#define _H_JFS_LOCK + +#include <linux/spinlock.h> +#include <linux/sched.h> + +/* + * jfs_lock.h + */ + +/* + * Conditional sleep where condition is protected by spinlock + * + * lock_cmd and unlock_cmd take and release the spinlock + */ +#define __SLEEP_COND(wq, cond, lock_cmd, unlock_cmd) \ +do { \ + DECLARE_WAITQUEUE(__wait, current); \ + \ + add_wait_queue(&wq, &__wait); \ + for (;;) { \ + set_current_state(TASK_UNINTERRUPTIBLE);\ + if (cond) \ + break; \ + unlock_cmd; \ + schedule(); \ + lock_cmd; \ + } \ + current->state = TASK_RUNNING; \ + remove_wait_queue(&wq, &__wait); \ +} while (0) + +#endif /* _H_JFS_LOCK */ |