ILSpy/ICSharpCode.ILSpyX/Settings/MutexProtector.cs

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using System;
using System.Threading;

namespace ICSharpCode.ILSpyX.Settings
{
	/// <summary>
	/// Guards a config-file read-modify-write with a named <see cref="Mutex"/> so that two ILSpy
	/// instances editing the same sidecar (the settings XML, the bookmark list, ...) fold their
	/// changes in turn instead of overwriting each other. Acquire it around the
	/// read-update-write block and dispose it to release.
	/// </summary>
	public sealed class MutexProtector : IDisposable
	{
		readonly Mutex mutex;

		public MutexProtector(string name)
		{
			this.mutex = new Mutex(true, name, out bool createdNew);
			if (createdNew)
				return;

			try
			{
				mutex.WaitOne();
			}
			catch (AbandonedMutexException)
			{
			}
		}

		public void Dispose()
		{
			mutex.ReleaseMutex();
			mutex.Dispose();
		}
	}
}