83 lines
2.7 KiB
C#
83 lines
2.7 KiB
C#
using System.Threading;
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#if (_WINDOWS_CE)
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using System;
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using System.Runtime.InteropServices;
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#endif
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namespace Amib.Threading.Internal
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{
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/// <summary>
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/// EventWaitHandleFactory class.
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/// This is a static class that creates AutoResetEvent and ManualResetEvent objects.
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/// In WindowCE the WaitForMultipleObjects API fails to use the Handle property
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/// of XxxResetEvent. It can use only handles that were created by the CreateEvent API.
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/// Consequently this class creates the needed XxxResetEvent and replaces the handle if
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/// it's a WindowsCE OS.
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/// </summary>
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public static class EventWaitHandleFactory
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{
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/// <summary>
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/// Create a new AutoResetEvent object
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/// </summary>
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/// <returns>Return a new AutoResetEvent object</returns>
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public static AutoResetEvent CreateAutoResetEvent()
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{
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AutoResetEvent waitHandle = new AutoResetEvent(false);
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#if (_WINDOWS_CE)
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ReplaceEventHandle(waitHandle, false, false);
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#endif
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return waitHandle;
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}
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/// <summary>
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/// Create a new ManualResetEvent object
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/// </summary>
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/// <returns>Return a new ManualResetEvent object</returns>
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public static ManualResetEvent CreateManualResetEvent(bool initialState)
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{
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ManualResetEvent waitHandle = new ManualResetEvent(initialState);
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#if (_WINDOWS_CE)
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ReplaceEventHandle(waitHandle, true, initialState);
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#endif
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return waitHandle;
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}
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#if (_WINDOWS_CE)
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/// <summary>
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/// Replace the event handle
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/// </summary>
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/// <param name="waitHandle">The WaitHandle object which its handle needs to be replaced.</param>
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/// <param name="manualReset">Indicates if the event is a ManualResetEvent (true) or an AutoResetEvent (false)</param>
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/// <param name="initialState">The initial state of the event</param>
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private static void ReplaceEventHandle(WaitHandle waitHandle, bool manualReset, bool initialState)
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{
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// Store the old handle
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IntPtr oldHandle = waitHandle.Handle;
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// Create a new event
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IntPtr newHandle = CreateEvent(IntPtr.Zero, manualReset, initialState, null);
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// Replace the old event with the new event
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waitHandle.Handle = newHandle;
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// Close the old event
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CloseHandle (oldHandle);
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}
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[DllImport("coredll.dll", SetLastError = true)]
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public static extern IntPtr CreateEvent(IntPtr lpEventAttributes, bool bManualReset, bool bInitialState, string lpName);
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//Handle
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[DllImport("coredll.dll", SetLastError = true)]
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public static extern bool CloseHandle(IntPtr hObject);
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#endif
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}
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}
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