/* * ALSA sequencer FIFO * Copyright (c) 1998 by Frank van de Pol * * * 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_FIFO_H #define __SND_SEQ_FIFO_H #include "seq_memory.h" #include "seq_lock.h" /* === FIFO === */ struct snd_seq_fifo { struct snd_seq_pool *pool; /* FIFO pool */ struct snd_seq_event_cell *head; /* pointer to head of fifo */ struct snd_seq_event_cell *tail; /* pointer to tail of fifo */ int cells; spinlock_t lock; snd_use_lock_t use_lock; wait_queue_head_t input_sleep; atomic_t overflow; }; /* create new fifo (constructor) */ struct snd_seq_fifo *snd_seq_fifo_new(int poolsize); /* delete fifo (destructor) */ void snd_seq_fifo_delete(struct snd_seq_fifo **f); /* enqueue event to fifo */ int snd_seq_fifo_event_in(struct snd_seq_fifo *f, struct snd_seq_event *event); /* lock fifo from release */ #define snd_seq_fifo_lock(fifo) snd_use_lock_use(&(fifo)->use_lock) #define snd_seq_fifo_unlock(fifo) snd_use_lock_free(&(fifo)->use_lock) /* get a cell from fifo - fifo should be locked */ int snd_seq_fifo_cell_out(struct snd_seq_fifo *f, struct snd_seq_event_cell **cellp, int nonblock); /* free dequeued cell - fifo should be locked */ void snd_seq_fifo_cell_putback(struct snd_seq_fifo *f, struct snd_seq_event_cell *cell); /* clean up queue */ void snd_seq_fifo_clear(struct snd_seq_fifo *f); /* polling */ int snd_seq_fifo_poll_wait(struct snd_seq_fifo *f, struct file *file, poll_table *wait); /* resize pool in fifo */ int snd_seq_fifo_resize(struct snd_seq_fifo *f, int poolsize); #endif p'>log msg

path: root/sound/arm/Makefile

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