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//
// CoreExtensions.ReaderWriterLockSlim.cs
//
// Author:
// Marius Ungureanu <maungu@microsoft.com>
//
// Copyright (c) 2019 Microsoft Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#nullable enable
using System.Threading;
namespace System
{
public static partial class CoreExtensions
{
internal static ReadLockExiter Read (this ReaderWriterLockSlim @lock)
=> new ReadLockExiter (@lock);
internal readonly struct ReadLockExiter : IDisposable
{
readonly ReaderWriterLockSlim _lock;
internal ReadLockExiter (ReaderWriterLockSlim @lock)
{
_lock = @lock;
@lock.EnterReadLock ();
}
public void Dispose () => _lock.ExitReadLock ();
}
internal static UpgradeableReadLockExiter UpgradeableRead (this ReaderWriterLockSlim @lock)
=> new UpgradeableReadLockExiter (@lock);
internal readonly struct UpgradeableReadLockExiter : IDisposable
{
readonly ReaderWriterLockSlim _lock;
internal UpgradeableReadLockExiter (ReaderWriterLockSlim @lock)
{
_lock = @lock;
@lock.EnterUpgradeableReadLock ();
}
public void Dispose ()
{
if (_lock.IsWriteLockHeld) {
_lock.ExitWriteLock ();
}
_lock.ExitUpgradeableReadLock ();
}
public void EnterWrite () => _lock.EnterWriteLock ();
}
internal static WriteLockExiter Write (this ReaderWriterLockSlim @lock)
=> new WriteLockExiter (@lock);
internal readonly struct WriteLockExiter : IDisposable
{
readonly ReaderWriterLockSlim _lock;
internal WriteLockExiter (ReaderWriterLockSlim @lock)
{
_lock = @lock;
@lock.EnterWriteLock ();
}
public void Dispose () => _lock.ExitWriteLock ();
}
}
}
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