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59 lines
1.7 KiB
59 lines
1.7 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* ALSA sequencer FIFO |
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* Copyright (c) 1998 by Frank van de Pol <[email protected]> |
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*/ |
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#ifndef __SND_SEQ_FIFO_H |
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#define __SND_SEQ_FIFO_H |
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#include "seq_memory.h" |
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#include "seq_lock.h" |
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/* === FIFO === */ |
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struct snd_seq_fifo { |
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struct snd_seq_pool *pool; /* FIFO pool */ |
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struct snd_seq_event_cell *head; /* pointer to head of fifo */ |
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struct snd_seq_event_cell *tail; /* pointer to tail of fifo */ |
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int cells; |
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spinlock_t lock; |
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snd_use_lock_t use_lock; |
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wait_queue_head_t input_sleep; |
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atomic_t overflow; |
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}; |
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/* create new fifo (constructor) */ |
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struct snd_seq_fifo *snd_seq_fifo_new(int poolsize); |
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/* delete fifo (destructor) */ |
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void snd_seq_fifo_delete(struct snd_seq_fifo **f); |
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/* enqueue event to fifo */ |
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int snd_seq_fifo_event_in(struct snd_seq_fifo *f, struct snd_seq_event *event); |
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/* lock fifo from release */ |
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#define snd_seq_fifo_lock(fifo) snd_use_lock_use(&(fifo)->use_lock) |
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#define snd_seq_fifo_unlock(fifo) snd_use_lock_free(&(fifo)->use_lock) |
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/* get a cell from fifo - fifo should be locked */ |
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int snd_seq_fifo_cell_out(struct snd_seq_fifo *f, struct snd_seq_event_cell **cellp, int nonblock); |
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/* free dequeued cell - fifo should be locked */ |
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void snd_seq_fifo_cell_putback(struct snd_seq_fifo *f, struct snd_seq_event_cell *cell); |
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/* clean up queue */ |
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void snd_seq_fifo_clear(struct snd_seq_fifo *f); |
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/* polling */ |
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int snd_seq_fifo_poll_wait(struct snd_seq_fifo *f, struct file *file, poll_table *wait); |
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/* resize pool in fifo */ |
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int snd_seq_fifo_resize(struct snd_seq_fifo *f, int poolsize); |
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/* get the number of unused cells safely */ |
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int snd_seq_fifo_unused_cells(struct snd_seq_fifo *f); |
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#endif
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