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1da177e4 LT |
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 | ||
d81a6d71 | 22 | #include <linux/export.h> |
1da177e4 LT |
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) { | |
04cc79a0 | 34 | pr_warn("ALSA: seq_lock: lock trouble [counter = %d] in %s:%d\n", atomic_read(lockp), file, line); |
1da177e4 LT |
35 | return; |
36 | } | |
37 | while (atomic_read(lockp) > 0) { | |
38 | if (max_count == 0) { | |
04cc79a0 | 39 | pr_warn("ALSA: seq_lock: timeout [%d left] in %s:%d\n", atomic_read(lockp), file, line); |
1da177e4 LT |
40 | break; |
41 | } | |
8433a509 | 42 | schedule_timeout_uninterruptible(1); |
1da177e4 LT |
43 | max_count--; |
44 | } | |
45 | } | |
46 | ||
91715ed9 TI |
47 | EXPORT_SYMBOL(snd_use_lock_sync_helper); |
48 | ||
1da177e4 | 49 | #endif |