Quelle  seq_lock.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Do sleep inside a spin-lock
 *  Copyright (c) 1999 by Takashi Iwai <tiwai@suse.de>
 */

#include <linux/export.h>
#include <sound/core.h>
#include "seq_lock.h"

/* wait until all locks are released */
void snd_use_lock_sync_helper(snd_use_lock_t *lockp, const char *file, int line)
{
 int warn_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 (warn_count-- == 0)
   pr_warn("ALSA: seq_lock: waiting [%d left] in %s:%d\n", atomic_read(lockp), file, line);
  schedule_timeout_uninterruptible(1);
 }
}
EXPORT_SYMBOL(snd_use_lock_sync_helper);