| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Do sleep inside a spin-lock |
| 3 | * Copyright (c) 1999 by Takashi Iwai <tiwai@suse.de> |
| 4 | * |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 | * |
| 20 | */ |
| 21 | |
| 22 | #include <sound/driver.h> |
| 23 | #include <sound/core.h> |
| 24 | #include "seq_lock.h" |
| 25 | |
| 26 | #if defined(CONFIG_SMP) || defined(CONFIG_SND_DEBUG) |
| 27 | |
| 28 | /* wait until all locks are released */ |
| 29 | void snd_use_lock_sync_helper(snd_use_lock_t *lockp, const char *file, int line) |
| 30 | { |
| 31 | int max_count = 5 * HZ; |
| 32 | |
| 33 | if (atomic_read(lockp) < 0) { |
| 34 | printk(KERN_WARNING "seq_lock: lock trouble [counter = %d] in %s:%d\n", atomic_read(lockp), file, line); |
| 35 | return; |
| 36 | } |
| 37 | while (atomic_read(lockp) > 0) { |
| 38 | if (max_count == 0) { |
| 39 | snd_printk(KERN_WARNING "seq_lock: timeout [%d left] in %s:%d\n", atomic_read(lockp), file, line); |
| 40 | break; |
| 41 | } |
| 42 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 43 | schedule_timeout(1); |
| 44 | max_count--; |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | #endif |