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Networking/SmartThreadPool/EventWaitHandle.cs

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+#if (_WINDOWS_CE)
+
+using System;
+using System.Runtime.InteropServices;
+using System.Threading;
+
+namespace Amib.Threading.Internal
+{
+    /// <summary>
+    /// EventWaitHandle class
+    /// In WindowsCE this class doesn't exist and I needed the WaitAll and WaitAny implementation.
+    /// So I wrote this class to implement these two methods with some of their overloads.
+    /// It uses the WaitForMultipleObjects API to do the WaitAll and WaitAny.
+    /// Note that this class doesn't even inherit from WaitHandle!
+    /// </summary>
+    public class STPEventWaitHandle
+    {
+        #region Public Constants
+
+        public const int WaitTimeout = Timeout.Infinite;
+
+        #endregion
+
+        #region Private External Constants
+
+        private const Int32 WAIT_FAILED = -1;
+        private const Int32 WAIT_TIMEOUT = 0x102;
+        private const UInt32 INFINITE = 0xFFFFFFFF;
+
+        #endregion
+
+        #region WaitAll and WaitAny
+
+        internal static bool WaitOne(WaitHandle waitHandle, int millisecondsTimeout, bool exitContext)
+        {
+            return waitHandle.WaitOne(millisecondsTimeout, exitContext);
+        }
+
+	    private static IntPtr[] PrepareNativeHandles(WaitHandle[] waitHandles)
+	    {
+	        IntPtr[] nativeHandles = new IntPtr[waitHandles.Length];
+	        for (int i = 0; i < waitHandles.Length; i++)
+	        {
+                nativeHandles[i] = waitHandles[i].Handle;
+	        }
+	        return nativeHandles;
+	    }
+
+	    public static bool WaitAll(WaitHandle[] waitHandles, int millisecondsTimeout, bool exitContext)
+	    {
+            uint timeout = millisecondsTimeout < 0 ? INFINITE : (uint)millisecondsTimeout;
+
+            IntPtr[] nativeHandles = PrepareNativeHandles(waitHandles);
+
+	        int result = WaitForMultipleObjects((uint)waitHandles.Length, nativeHandles, true, timeout);
+
+            if (result == WAIT_TIMEOUT || result == WAIT_FAILED)
+            {
+                return false;
+            }
+
+	        return true;
+	    }
+
+
+	    public static int WaitAny(WaitHandle[] waitHandles, int millisecondsTimeout, bool exitContext)
+        {
+            uint timeout = millisecondsTimeout < 0 ? INFINITE : (uint)millisecondsTimeout;
+
+            IntPtr[] nativeHandles = PrepareNativeHandles(waitHandles);
+
+            int result = WaitForMultipleObjects((uint)waitHandles.Length, nativeHandles, false, timeout);
+
+            if (result >= 0 && result < waitHandles.Length)
+            {
+                return result;
+            }
+
+            return -1;
+        }
+
+        public static int WaitAny(WaitHandle[] waitHandles)
+        {
+            return WaitAny(waitHandles, Timeout.Infinite, false);
+        }
+
+        public static int WaitAny(WaitHandle[] waitHandles, TimeSpan timeout, bool exitContext)
+        {
+            int millisecondsTimeout = (int)timeout.TotalMilliseconds;
+
+            return WaitAny(waitHandles, millisecondsTimeout, false);
+        }
+ 
+        #endregion
+
+        #region External methods
+
+        [DllImport("coredll.dll", SetLastError = true)]
+        public static extern int WaitForMultipleObjects(uint nCount, IntPtr[] lpHandles, bool fWaitAll, uint dwMilliseconds);
+
+        #endregion
+    }
+}
+#endif