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POHow to find that Mutex in C# is acquired?
 

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  1. POHow to find that Mutex in C# is acquired?
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    <p>How can I find from mutex handle in C# that a mutex is acquired?</p> <p>When <code>mutex.WaitOne(timeout)</code> timeouts, it returns <code>false</code>. However, how can I find that from the mutex handle? (Maybe using p/invoke.)</p> <p><strong>UPDATE</strong>:</p> <pre><code>public class InterProcessLock : IDisposable { readonly Mutex mutex; public bool IsAcquired { get; private set; } public InterProcessLock(string name, TimeSpan timeout) { bool created; var security = new MutexSecurity(); security.AddAccessRule(new MutexAccessRule(new SecurityIdentifier(WellKnownSidType.WorldSid, null), MutexRights.Synchronize | MutexRights.Modify, AccessControlType.Allow)); mutex = new Mutex(false, name, out created, security); IsAcquired = mutex.WaitOne(timeout); } #region IDisposable Members public void Dispose() { if (IsAcquired) { mutex.ReleaseMutex(); IsAcquired = false; } } #endregion } </code></pre> <p>Currently, I am using my own property <code>IsAcquired</code> to determine whether I should release a mutex. Not essential but clearer, would be not to use a secondary copy of the information represented by <code>IsAcquired</code> property, but rather to ask directly the mutex whether it is acquired by me. Since calling <code>mutex.ReleaseMutex()</code> throws an exception if it is not acquired by me.</p> <p>(By <em>acquired</em> state I mean that the mutex is in <em>not-signaled</em> state when I am <em>owning</em> the mutex.)</p> <p>(EDIT: I have added <code>IsAcquired = false;</code> thanks to <a href="https://stackoverflow.com/questions/3013212/how-to-find-that-mutex-in-c-is-acquired/3019775#3019775">mattdekrey's post</a>.) </p>
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