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sys/param.h was manually adjusted to not define __NetBSD_Version__ since it will be defined by the compiler.
128 lines
4.1 KiB
C
Vendored
128 lines
4.1 KiB
C
Vendored
/* $NetBSD: psref.h,v 1.4 2019/05/17 03:34:27 ozaki-r Exp $ */
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/*-
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* Copyright (c) 2016 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Taylor R. Campbell.
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _SYS_PSREF_H
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#define _SYS_PSREF_H
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#ifdef _KERNEL_OPT
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#include "opt_psref_debug.h"
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#endif
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#include <sys/types.h>
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#include <sys/queue.h>
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struct cpu_info;
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struct lwp;
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struct psref;
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struct psref_class;
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struct psref_target;
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/*
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* struct psref_target
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*
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* Bookkeeping for an object to which users can acquire passive
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* references. This is compact so that it can easily be embedded
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* into many multitudes of objects, e.g. IP packet flows.
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*
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* prt_draining is false on initialization, and may be written
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* only once, to make it true, when someone has prevented new
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* references from being created and wants to drain the target in
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* order to destroy it.
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*/
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struct psref_target {
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struct psref_class *prt_class;
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bool prt_draining;
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};
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/*
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* struct psref
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*
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* Bookkeeping for a single passive reference. There should only
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* be a few of these per CPU in the system at once, no matter how
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* many targets are stored, so these are a bit larger than struct
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* psref_target. The contents of struct psref may be read and
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* written only on the local CPU.
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*/
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struct psref {
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SLIST_ENTRY(psref) psref_entry;
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void *psref_debug; /* For debugging */
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const struct psref_target *psref_target;
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struct lwp *psref_lwp;
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struct cpu_info *psref_cpu;
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};
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#ifdef _KERNEL
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void psref_init(void);
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struct psref_class *
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psref_class_create(const char *, int);
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void psref_class_destroy(struct psref_class *);
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void psref_target_init(struct psref_target *, struct psref_class *);
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void psref_target_destroy(struct psref_target *, struct psref_class *);
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void psref_acquire(struct psref *, const struct psref_target *,
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struct psref_class *);
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void psref_release(struct psref *, const struct psref_target *,
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struct psref_class *);
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void psref_copy(struct psref *, const struct psref *,
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struct psref_class *);
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/* For use only in assertions. */
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bool psref_held(const struct psref_target *, struct psref_class *);
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#ifdef PSREF_DEBUG
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void psref_debug_barrier(void);
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void psref_debug_init_lwp(struct lwp *);
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#define PSREF_DEBUG_BARRIER() psref_debug_barrier()
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#define PSREF_DEBUG_INIT_LWP(l) psref_debug_init_lwp((l))
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#define PSREF_DEBUG_FILL_RETURN_ADDRESS0(psref, addr) do { \
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(psref)->psref_debug = (addr); \
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} while (0)
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#define PSREF_DEBUG_FILL_RETURN_ADDRESS(psref) do { \
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PSREF_DEBUG_FILL_RETURN_ADDRESS0(psref, __builtin_return_address(0));\
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} while (0)
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#else
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#define PSREF_DEBUG_BARRIER() __nothing
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#define PSREF_DEBUG_INIT_LWP(l) __nothing
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#define PSREF_DEBUG_FILL_RETURN_ADDRESS0(psref, addr) __nothing
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#define PSREF_DEBUG_FILL_RETURN_ADDRESS(psref) __nothing
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#endif /* PSREF_DEBUG */
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#endif /* _KERNEL */
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#endif /* _SYS_PSREF_H */ |