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