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
49
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