[mirror_ubuntu-focal-kernel.git] / sound / core / seq / seq_lock.c

/*
 *  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"

/* 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);
Commit	Line	Data
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
1da177e4 LT	26	/* wait until all locks are released */
	27	void snd_use_lock_sync_helper(snd_use_lock_t lockp, const char file, int line)
	28	{
4e7655fd	29	int warn_count = 5 * HZ;
1da177e4 LT	30
1da177e4 LT	31	if (atomic_read(lockp) < 0) {
04cc79a0	32	pr_warn("ALSA: seq_lock: lock trouble [counter = %d] in %s:%d\n", atomic_read(lockp), file, line);
1da177e4 LT	33	return;
	34	}
	35	while (atomic_read(lockp) > 0) {
4e7655fd TI	36	if (warn_count-- == 0)
4e7655fd TI	37	pr_warn("ALSA: seq_lock: waiting [%d left] in %s:%d\n", atomic_read(lockp), file, line);
8433a509	38	schedule_timeout_uninterruptible(1);
1da177e4 LT	39	}
1da177e4 LT	40	}
91715ed9	41	EXPORT_SYMBOL(snd_use_lock_sync_helper);