1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * ALSA sequencer Priority Queue 4 * Copyright (c) 1998 by Frank van de Pol <fvdpol@coil.demon.nl> 5 */ 6 #ifndef __SND_SEQ_PRIOQ_H 7 #define __SND_SEQ_PRIOQ_H 8 9 #include "seq_memory.h" 10 11 12 /* === PRIOQ === */ 13 14 struct snd_seq_prioq { 15 struct snd_seq_event_cell *head; /* pointer to head of prioq */ 16 struct snd_seq_event_cell *tail; /* pointer to tail of prioq */ 17 int cells; 18 spinlock_t lock; 19 }; 20 21 22 /* create new prioq (constructor) */ 23 struct snd_seq_prioq *snd_seq_prioq_new(void); 24 25 /* delete prioq (destructor) */ 26 void snd_seq_prioq_delete(struct snd_seq_prioq **fifo); 27 28 /* enqueue cell to prioq */ 29 int snd_seq_prioq_cell_in(struct snd_seq_prioq *f, struct snd_seq_event_cell *cell); 30 31 /* dequeue cell from prioq */ 32 struct snd_seq_event_cell *snd_seq_prioq_cell_out(struct snd_seq_prioq *f, 33 void *current_time); 34 35 /* return number of events available in prioq */ 36 int snd_seq_prioq_avail(struct snd_seq_prioq *f); 37 38 /* client left queue */ 39 void snd_seq_prioq_leave(struct snd_seq_prioq *f, int client, int timestamp); 40 41 /* Remove events */ 42 void snd_seq_prioq_remove_events(struct snd_seq_prioq *f, int client, 43 struct snd_seq_remove_events *info); 44 45 #endif 46