| /* |
| * Do sleep inside a spin-lock |
| * Copyright (c) 1999 by Takashi Iwai <tiwai@suse.de> |
| * |
| * |
| * 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 |
| * |
| */ |
| |
| #include <linux/export.h> |
| #include <sound/core.h> |
| #include "seq_lock.h" |
| |
| #if defined(CONFIG_SMP) || defined(CONFIG_SND_DEBUG) |
| |
| /* wait until all locks are released */ |
| void snd_use_lock_sync_helper(snd_use_lock_t *lockp, const char *file, int line) |
| { |
| int max_count = 5 * HZ; |
| |
| if (atomic_read(lockp) < 0) { |
| pr_warn("ALSA: seq_lock: lock trouble [counter = %d] in %s:%d\n", atomic_read(lockp), file, line); |
| return; |
| } |
| while (atomic_read(lockp) > 0) { |
| if (max_count == 0) { |
| pr_warn("ALSA: seq_lock: timeout [%d left] in %s:%d\n", atomic_read(lockp), file, line); |
| break; |
| } |
| schedule_timeout_uninterruptible(1); |
| max_count--; |
| } |
| } |
| |
| EXPORT_SYMBOL(snd_use_lock_sync_helper); |
| |
| #endif |
