SetAccessRule() public method

public SetAccessRule ( MutexAccessRule rule ) : void
rule MutexAccessRule
return void
        private static void CleanUpMessages(object state)
        {
            var directory = (DirectoryInfo) state;

            bool createdNew;
            var mutexName = string.Concat(MutexCleanUpKey, ".", directory.Name);
            var accessControl = new MutexSecurity();
            var sid = new SecurityIdentifier(WellKnownSidType.AuthenticatedUserSid, null);
            accessControl.SetAccessRule(new MutexAccessRule(sid, MutexRights.FullControl, AccessControlType.Allow));
            using (var mutex = new Mutex(true, mutexName, out createdNew, accessControl))
            {
                if (createdNew)
                {
                    try
                    {
                        Thread.Sleep(FileTimeoutMilliseconds);
                    }
                    catch (ThreadInterruptedException)
                    {
                    }
                    CleanUpMessages(directory);
                    mutex.ReleaseMutex();
                }
            }
            if (createdNew)
            {
                ThreadPool.QueueUserWorkItem(CleanUpMessages, directory);
            }
        }
        /// <summary>
        /// 	This method is called within a seperate thread and deletes messages that are older than
        /// 	the pre-defined expiry time.
        /// </summary>
        /// <param name = "state"></param>
        private static void CleanUpMessages(object state)
        {
            var directory = (DirectoryInfo) state;

            // use a mutex to ensure only one listener system wide is running
            bool createdNew;
            string mutexName = string.Concat(mutexCleanUpKey, ".", directory.Name);
            var accessControl = new MutexSecurity();
            var sid = new SecurityIdentifier(WellKnownSidType.AuthenticatedUserSid, null);
            accessControl.SetAccessRule(new MutexAccessRule(sid, MutexRights.FullControl, AccessControlType.Allow));
            using (var mutex = new Mutex(true, mutexName, out createdNew, accessControl))
            {
                // we this thread owns the Mutex then clean up otherwise exit.
                if (createdNew)
                {
                    // wait for the specified timeout before attempting to clean directory
                    try
                    {
                        Thread.Sleep(fileTimeoutMilliseconds);
                    }
                    catch (ThreadInterruptedException)
                    {
                    }
                    CleanUpMessages(directory);
                    // release the mutex
                    mutex.ReleaseMutex();
                }
            }
            if (createdNew)
            {
                // after mutex release add an additional thread for cleanup in case we're the last out
                // and there are now additional files to clean
                ThreadPool.QueueUserWorkItem(CleanUpMessages, directory);
            }
        }