moves 4 more utilities

src/Umbraco.Core/WaitHandleExtensions.cs

@@ -1,44 +0,0 @@
-using System.Threading;
-using System.Threading.Tasks;
-
-namespace Umbraco.Core
-{
-    internal static class WaitHandleExtensions
-    {
-
-        // http://stackoverflow.com/questions/25382583/waiting-on-a-named-semaphore-with-waitone100-vs-waitone0-task-delay100
-        // http://blog.nerdbank.net/2011/07/c-await-for-waithandle.html
-        // F# has a AwaitWaitHandle method that accepts a time out... and seems pretty complex...
-        // version below should be OK
-
-        public static Task WaitOneAsync(this WaitHandle handle, int millisecondsTimeout = Timeout.Infinite)
-        {
-            var tcs = new TaskCompletionSource<object>();
-            var callbackHandleInitLock = new object();
-            lock (callbackHandleInitLock)
-            {
-                RegisteredWaitHandle callbackHandle = null;
-                // ReSharper disable once RedundantAssignment
-                callbackHandle = ThreadPool.RegisterWaitForSingleObject(
-                    handle,
-                    (state, timedOut) =>
-                    {
-                        tcs.SetResult(null);
-
-                        // we take a lock here to make sure the outer method has completed setting the local variable callbackHandle.
-                        lock (callbackHandleInitLock)
-                        {
-                            // ReSharper disable once PossibleNullReferenceException
-                            // ReSharper disable once AccessToModifiedClosure
-                            callbackHandle.Unregister(null);
-                        }
-                    },
-                    /*state:*/ null,
-                    /*millisecondsTimeOutInterval:*/ millisecondsTimeout,
-                    /*executeOnlyOnce:*/ true);
-            }
-
-            return tcs.Task;
-        }
-    }
-}