99 lines
2.9 KiB
C#
99 lines
2.9 KiB
C#
/*
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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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namespace LibreMetaverse.Threading.Disposers
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{
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/// <summary>
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/// Class returned by UpgradeableLock method.
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/// </summary>
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public struct OptimisticUpgradeableLock:
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IUpgradeableLock
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{
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private OptimisticReaderWriterLock _lock;
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private bool _upgraded;
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internal OptimisticUpgradeableLock(OptimisticReaderWriterLock yieldLock)
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{
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_lock = yieldLock;
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_upgraded = false;
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}
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/// <summary>
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/// Upgrades this lock to a write-lock.
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/// </summary>
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public OptimisticWriteLock DisposableUpgrade()
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{
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var yieldLock = _lock;
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if (yieldLock == null)
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throw new ObjectDisposedException(GetType().FullName);
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yieldLock.UncheckedUpgradeToWriteLock();
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return new OptimisticWriteLock(yieldLock);
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}
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/// <summary>
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/// Upgrades the lock to a write-lock.
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/// Returns true if the lock was upgraded, false if it was
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/// already upgraded before.
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/// </summary>
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public bool Upgrade()
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{
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var yieldLock = _lock;
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if (yieldLock == null)
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throw new ObjectDisposedException(GetType().FullName);
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if (_upgraded)
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return false;
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yieldLock.UncheckedUpgradeToWriteLock();
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_upgraded = true;
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return true;
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}
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/// <summary>
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/// Releases the lock.
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/// </summary>
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public void Dispose()
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{
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var yieldLock = _lock;
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if (yieldLock != null)
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{
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_lock = null;
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yieldLock.ExitUpgradeableLock(_upgraded);
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}
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}
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IDisposable IUpgradeableLock.DisposableUpgrade()
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{
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return DisposableUpgrade();
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}
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}
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}
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