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/core.h>
23 #include "seq_lock.h"
24
25 #if defined(CONFIG_SMP) || defined(CONFIG_SND_DEBUG)
26
27 /* wait until all locks are released */
snd_use_lock_sync_helper(snd_use_lock_t * lockp,const char * file,int line)28 void snd_use_lock_sync_helper(snd_use_lock_t *lockp, const char *file, int line)
29 {
30 int max_count = 5 * HZ;
31
32 if (atomic_read(lockp) < 0) {
33 printk(KERN_WARNING "seq_lock: lock trouble [counter = %d] in %s:%d\n", atomic_read(lockp), file, line);
34 return;
35 }
36 while (atomic_read(lockp) > 0) {
37 if (max_count == 0) {
38 snd_printk(KERN_WARNING "seq_lock: timeout [%d left] in %s:%d\n", atomic_read(lockp), file, line);
39 break;
40 }
41 schedule_timeout_uninterruptible(1);
42 max_count--;
43 }
44 }
45
46 EXPORT_SYMBOL(snd_use_lock_sync_helper);
47
48 #endif
49