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/*-
* Copyright (c) 2007 Ariff Abdullah <ariff@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD: release/9.1.0/sys/dev/sound/clone.h 170719 2007-06-14 11:10:21Z ariff $
*/
#ifndef _SND_CLONE_H_
#define _SND_CLONE_H_
struct snd_clone_entry;
struct snd_clone;
/*
* 750 milisecond default deadline. Short enough to not cause excessive
* garbage collection, long enough to indicate stalled VFS.
*/
#define SND_CLONE_DEADLINE_DEFAULT 750
/*
* Fit within 24bit MAXMINOR.
*/
#define SND_CLONE_MAXUNIT 0xffffff
/*
* Creation flags, mostly related to the behaviour of garbage collector.
*
* SND_CLONE_ENABLE - Enable clone allocation.
* SND_CLONE_GC_ENABLE - Enable garbage collector operation, automatically
* or if explicitly called upon.
* SND_CLONE_GC_UNREF - Garbage collect during unref operation.
* SND_CLONE_GC_LASTREF - Garbage collect during last reference
* (refcount = 0)
* SND_CLONE_GC_EXPIRED - Don't garbage collect unless the global clone
* handler has been expired.
* SND_CLONE_GC_REVOKE - Revoke clone invocation status which has been
* expired instead of removing and freeing it.
* SND_CLONE_WAITOK - malloc() is allowed to sleep while allocating
* clone entry.
*/
#define SND_CLONE_ENABLE 0x00000001
#define SND_CLONE_GC_ENABLE 0x00000002
#define SND_CLONE_GC_UNREF 0x00000004
#define SND_CLONE_GC_LASTREF 0x00000008
#define SND_CLONE_GC_EXPIRED 0x00000010
#define SND_CLONE_GC_REVOKE 0x00000020
#define SND_CLONE_WAITOK 0x80000000
#define SND_CLONE_GC_MASK (SND_CLONE_GC_ENABLE | \
SND_CLONE_GC_UNREF | \
SND_CLONE_GC_LASTREF | \
SND_CLONE_GC_EXPIRED | \
SND_CLONE_GC_REVOKE)
#define SND_CLONE_MASK (SND_CLONE_ENABLE | SND_CLONE_GC_MASK | \
SND_CLONE_WAITOK)
/*
* Runtime clone device flags
*
* These are mostly private to the clone manager operation:
*
* SND_CLONE_NEW - New clone allocation in progress.
* SND_CLONE_INVOKE - Cloning being invoked, waiting for next VFS operation.
* SND_CLONE_BUSY - In progress, being referenced by living thread/proc.
*/
#define SND_CLONE_NEW 0x00000001
#define SND_CLONE_INVOKE 0x00000002
#define SND_CLONE_BUSY 0x00000004
/*
* Nothing important, just for convenience.
*/
#define SND_CLONE_ALLOC (SND_CLONE_NEW | SND_CLONE_INVOKE | \
SND_CLONE_BUSY)
#define SND_CLONE_DEVMASK SND_CLONE_ALLOC
void snd_timestamp(struct timespec *);
struct snd_clone *snd_clone_create(int, int, int, uint32_t);
int snd_clone_busy(struct snd_clone *);
int snd_clone_enable(struct snd_clone *);
int snd_clone_disable(struct snd_clone *);
int snd_clone_getsize(struct snd_clone *);
int snd_clone_getmaxunit(struct snd_clone *);
int snd_clone_setmaxunit(struct snd_clone *, int);
int snd_clone_getdeadline(struct snd_clone *);
int snd_clone_setdeadline(struct snd_clone *, int);
int snd_clone_gettime(struct snd_clone *, struct timespec *);
uint32_t snd_clone_getflags(struct snd_clone *);
uint32_t snd_clone_setflags(struct snd_clone *, uint32_t);
int snd_clone_getdevtime(struct cdev *, struct timespec *);
uint32_t snd_clone_getdevflags(struct cdev *);
uint32_t snd_clone_setdevflags(struct cdev *, uint32_t);
int snd_clone_gc(struct snd_clone *);
void snd_clone_destroy(struct snd_clone *);
int snd_clone_acquire(struct cdev *);
int snd_clone_release(struct cdev *);
int snd_clone_ref(struct cdev *);
int snd_clone_unref(struct cdev *);
void snd_clone_register(struct snd_clone_entry *, struct cdev *);
struct snd_clone_entry *snd_clone_alloc(struct snd_clone *, struct cdev **,
int *, int);
#define snd_clone_enabled(x) ((x) != NULL && \
(snd_clone_getflags(x) & SND_CLONE_ENABLE))
#define snd_clone_disabled(x) (!snd_clone_enabled(x))
#endif /* !_SND_CLONE_H */