LXR linux/sound/core/seq/seq

   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 <linux/export.h>
  23#include <sound/core.h>
  24#include "seq_lock.h"
  25
  26/* wait until all locks are released */
  27void snd_use_lock_sync_helper(snd_use_lock_t *lockp, const char *file, int line)
  28{
  29        int warn_count = 5 * HZ;
  30
  31        if (atomic_read(lockp) < 0) {
  32                pr_warn("ALSA: seq_lock: lock trouble [counter = %d] in %s:%d\n", atomic_read(lockp), file, line);
  33                return;
  34        }
  35        while (atomic_read(lockp) > 0) {
  36                if (warn_count-- == 0)
  37                        pr_warn("ALSA: seq_lock: waiting [%d left] in %s:%d\n", atomic_read(lockp), file, line);
  38                schedule_timeout_uninterruptible(1);
  39        }
  40}
  41EXPORT_SYMBOL(snd_use_lock_sync_helper);
  42