96 lines
3.2 KiB
C#
96 lines
3.2 KiB
C#
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/*
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* Copyright (c) 2024, Sjofn LLC
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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 are met:
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*
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* - Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* - Neither the name of the openmetaverse.co nor the names
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* of its contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND 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 COPYRIGHT OWNER OR CONTRIBUTORS BE
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* 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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using System;
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using LibreMetaverse.Threading.Disposers;
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namespace LibreMetaverse.Threading
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{
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/// <summary>
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/// A reader writer lock that uses SpinWait if it does not have the lock. If the locks are held for
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/// to much time, this is CPU consuming.
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/// In my general tests, it is about 20 times faster than ReaderWriterLockSlim class and two times
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/// faster than the YieldReaderWriterLock.
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/// </summary>
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public sealed class SpinReaderWriterLock:
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IReaderWriterLock
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{
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#region Fields
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internal SpinReaderWriterLockSlim Lock;
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#endregion
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#region ReadLock
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/// <summary>
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/// Acquires a read lock that must be used in a using clause.
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/// </summary>
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public SpinReadLock ReadLock()
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{
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Lock.EnterReadLock();
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return new SpinReadLock(this);
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}
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#endregion
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#region UpgradeableLock
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/// <summary>
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/// Acquires a upgradeable read lock that must be used in a using clause.
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/// </summary>
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public SpinUpgradeableLock UpgradeableLock()
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{
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Lock.EnterUpgradeableLock();
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return new SpinUpgradeableLock(this);
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}
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#endregion
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#region WriteLock
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/// <summary>
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/// Acquires a write lock that must be used in a using clause.
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/// If you are using a UpgradeableLock use the Upgrade method of the
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/// YieldUpgradeableLock instead or you will cause a dead-lock.
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/// </summary>
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public SpinWriteLock WriteLock()
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{
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Lock.EnterWriteLock();
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return new SpinWriteLock(this);
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}
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#endregion
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#region IReaderWriterLock Members
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IDisposable IReaderWriterLock.ReadLock()
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{
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return ReadLock();
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}
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IUpgradeableLock IReaderWriterLock.UpgradeableLock()
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{
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return UpgradeableLock();
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}
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IDisposable IReaderWriterLock.WriteLock()
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{
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return WriteLock();
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}
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#endregion
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}
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}
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