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copied!<p>I want to make sure this is out there, because it's so hard to get right:</p> <pre><code>using System.Runtime.InteropServices; //GuidAttribute using System.Reflection; //Assembly using System.Threading; //Mutex using System.Security.AccessControl; //MutexAccessRule using System.Security.Principal; //SecurityIdentifier static void Main(string[] args) { // get application GUID as defined in AssemblyInfo.cs string appGuid = ((GuidAttribute)Assembly.GetExecutingAssembly(). GetCustomAttributes(typeof(GuidAttribute), false). GetValue(0)).Value.ToString(); // unique id for global mutex - Global prefix means it is global to the machine string mutexId = string.Format( "Global\\{{{0}}}", appGuid ); // Need a place to store a return value in Mutex() constructor call bool createdNew; // edited by Jeremy Wiebe to add example of setting up security for multi-user usage // edited by 'Marc' to work also on localized systems (don't use just "Everyone") var allowEveryoneRule = new MutexAccessRule( new SecurityIdentifier( WellKnownSidType.WorldSid , null) , MutexRights.FullControl , AccessControlType.Allow ); var securitySettings = new MutexSecurity(); securitySettings.AddAccessRule(allowEveryoneRule); // edited by MasonGZhwiti to prevent race condition on security settings via VanNguyen using (var mutex = new Mutex(false, mutexId, out createdNew, securitySettings)) { // edited by acidzombie24 var hasHandle = false; try { try { // note, you may want to time out here instead of waiting forever // edited by acidzombie24 // mutex.WaitOne(Timeout.Infinite, false); hasHandle = mutex.WaitOne(5000, false); if (hasHandle == false) throw new TimeoutException("Timeout waiting for exclusive access"); } catch (AbandonedMutexException) { // Log the fact that the mutex was abandoned in another process, // it will still get acquired hasHandle = true; } // Perform your work here. } finally { // edited by acidzombie24, added if statement if(hasHandle) mutex.ReleaseMutex(); } } } </code></pre>

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