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c7eb0a7633
Sponsored-by: https://despairlabs.com/sponsor/ Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Rob Norris <robn@despairlabs.com> Closes #17861
63 lines
2.0 KiB
C
63 lines
2.0 KiB
C
// SPDX-License-Identifier: CDDL-1.0
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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or https://opensource.org/licenses/CDDL-1.0.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright 2011 Nexenta Systems, Inc. All rights reserved.
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* Copyright (c) 2012, 2018 by Delphix. All rights reserved.
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* Copyright (c) 2012, Joyent, Inc. All rights reserved.
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*/
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#ifndef _SYS_RWLOCK_H
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#define _SYS_RWLOCK_H
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#include <pthread.h>
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/*
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* RW locks
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*/
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typedef struct krwlock {
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pthread_rwlock_t rw_lock;
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pthread_t rw_owner;
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uint_t rw_readers;
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} krwlock_t;
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typedef int krw_t;
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#define RW_READER 0
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#define RW_WRITER 1
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#define RW_DEFAULT RW_READER
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#define RW_NOLOCKDEP RW_READER
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#define RW_READ_HELD(rw) ((rw)->rw_readers > 0)
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#define RW_WRITE_HELD(rw) pthread_equal((rw)->rw_owner, pthread_self())
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#define RW_LOCK_HELD(rw) (RW_READ_HELD(rw) || RW_WRITE_HELD(rw))
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extern void rw_init(krwlock_t *rwlp, char *name, int type, void *arg);
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extern void rw_destroy(krwlock_t *rwlp);
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extern void rw_enter(krwlock_t *rwlp, krw_t rw);
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extern int rw_tryenter(krwlock_t *rwlp, krw_t rw);
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extern int rw_tryupgrade(krwlock_t *rwlp);
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extern void rw_exit(krwlock_t *rwlp);
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#define rw_downgrade(rwlp) do { } while (0)
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#endif /* _SYS_RWLOCK_H */
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