[mirror_ubuntu-zesty-kernel.git] / sound / core / seq / seq_prioq.h

/*
 *   ALSA sequencer Priority Queue
 *   Copyright (c) 1998 by Frank van de Pol <fvdpol@coil.demon.nl>
 *
 *
 *   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
 *
 */
#ifndef __SND_SEQ_PRIOQ_H
#define __SND_SEQ_PRIOQ_H

#include "seq_memory.h"


/* === PRIOQ === */

struct snd_seq_prioq {
	struct snd_seq_event_cell *head;      /* pointer to head of prioq */
	struct snd_seq_event_cell *tail;      /* pointer to tail of prioq */
	int cells;
	spinlock_t lock;
};


/* create new prioq (constructor) */
struct snd_seq_prioq *snd_seq_prioq_new(void);

/* delete prioq (destructor) */
void snd_seq_prioq_delete(struct snd_seq_prioq **fifo);

/* enqueue cell to prioq */
int snd_seq_prioq_cell_in(struct snd_seq_prioq *f, struct snd_seq_event_cell *cell);

/* dequeue cell from prioq */ 
struct snd_seq_event_cell *snd_seq_prioq_cell_out(struct snd_seq_prioq *f);

/* return number of events available in prioq */
int snd_seq_prioq_avail(struct snd_seq_prioq *f);

/* peek at cell at the head of the prioq */
struct snd_seq_event_cell *snd_seq_prioq_cell_peek(struct snd_seq_prioq *f);

/* client left queue */
void snd_seq_prioq_leave(struct snd_seq_prioq *f, int client, int timestamp);        

/* Remove events */
void snd_seq_prioq_remove_events(struct snd_seq_prioq *f, int client,
				 struct snd_seq_remove_events *info);

#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	* ALSA sequencer Priority Queue
	3	* Copyright (c) 1998 by Frank van de Pol <fvdpol@coil.demon.nl>
	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	#ifndef __SND_SEQ_PRIOQ_H
	22	#define __SND_SEQ_PRIOQ_H
	23
	24	#include "seq_memory.h"
	25
	26
	27	/* === PRIOQ === */
	28
c7e0b5bf TI	29	struct snd_seq_prioq {
	30	struct snd_seq_event_cell head; / pointer to head of prioq */
	31	struct snd_seq_event_cell tail; / pointer to tail of prioq */
1da177e4 LT	32	int cells;
1da177e4 LT	33	spinlock_t lock;
c7e0b5bf	34	};
1da177e4 LT	35
	36
	37	/* create new prioq (constructor) */
c7e0b5bf	38	struct snd_seq_prioq *snd_seq_prioq_new(void);
1da177e4 LT	39
1da177e4 LT	40	/* delete prioq (destructor) */
c7e0b5bf	41	void snd_seq_prioq_delete(struct snd_seq_prioq **fifo);
1da177e4 LT	42
1da177e4 LT	43	/* enqueue cell to prioq */
c7e0b5bf	44	int snd_seq_prioq_cell_in(struct snd_seq_prioq f, struct snd_seq_event_cell cell);
1da177e4 LT	45
1da177e4 LT	46	/* dequeue cell from prioq */
c7e0b5bf	47	struct snd_seq_event_cell snd_seq_prioq_cell_out(struct snd_seq_prioq f);
1da177e4 LT	48
1da177e4 LT	49	/* return number of events available in prioq */
c7e0b5bf	50	int snd_seq_prioq_avail(struct snd_seq_prioq *f);
1da177e4 LT	51
1da177e4 LT	52	/* peek at cell at the head of the prioq */
c7e0b5bf	53	struct snd_seq_event_cell snd_seq_prioq_cell_peek(struct snd_seq_prioq f);
1da177e4 LT	54
1da177e4 LT	55	/* client left queue */
c7e0b5bf	56	void snd_seq_prioq_leave(struct snd_seq_prioq *f, int client, int timestamp);
1da177e4 LT	57
1da177e4 LT	58	/* Remove events */
c7e0b5bf TI	59	void snd_seq_prioq_remove_events(struct snd_seq_prioq *f, int client,
c7e0b5bf TI	60	struct snd_seq_remove_events *info);
1da177e4 LT	61
1da177e4 LT	62	#endif