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40ddba8256
Sponsored-by: https://despairlabs.com/sponsor/ Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Rob Norris <robn@despairlabs.com> Closes #17861
109 lines
2.5 KiB
C
109 lines
2.5 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 (c) 2012, 2018 by Delphix. All rights reserved.
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* Copyright (c) 2016 Actifio, Inc. All rights reserved.
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* Copyright (c) 2025, Klara, Inc.
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*/
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#include <assert.h>
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#include <pthread.h>
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#include <errno.h>
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#include <atomic.h>
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#include <sys/rwlock.h>
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/*
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* =========================================================================
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* rwlocks
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* =========================================================================
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*/
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void
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rw_init(krwlock_t *rwlp, char *name, int type, void *arg)
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{
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(void) name, (void) type, (void) arg;
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VERIFY0(pthread_rwlock_init(&rwlp->rw_lock, NULL));
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rwlp->rw_readers = 0;
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rwlp->rw_owner = 0;
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}
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void
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rw_destroy(krwlock_t *rwlp)
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{
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VERIFY0(pthread_rwlock_destroy(&rwlp->rw_lock));
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}
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void
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rw_enter(krwlock_t *rwlp, krw_t rw)
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{
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if (rw == RW_READER) {
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VERIFY0(pthread_rwlock_rdlock(&rwlp->rw_lock));
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atomic_inc_uint(&rwlp->rw_readers);
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} else {
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VERIFY0(pthread_rwlock_wrlock(&rwlp->rw_lock));
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rwlp->rw_owner = pthread_self();
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}
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}
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void
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rw_exit(krwlock_t *rwlp)
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{
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if (RW_READ_HELD(rwlp))
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atomic_dec_uint(&rwlp->rw_readers);
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else
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rwlp->rw_owner = 0;
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VERIFY0(pthread_rwlock_unlock(&rwlp->rw_lock));
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}
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int
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rw_tryenter(krwlock_t *rwlp, krw_t rw)
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{
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int error;
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if (rw == RW_READER)
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error = pthread_rwlock_tryrdlock(&rwlp->rw_lock);
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else
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error = pthread_rwlock_trywrlock(&rwlp->rw_lock);
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if (error == 0) {
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if (rw == RW_READER)
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atomic_inc_uint(&rwlp->rw_readers);
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else
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rwlp->rw_owner = pthread_self();
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return (1);
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}
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VERIFY3S(error, ==, EBUSY);
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return (0);
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}
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int
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rw_tryupgrade(krwlock_t *rwlp)
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{
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(void) rwlp;
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return (0);
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}
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