99 lines
2.9 KiB
C#
99 lines
2.9 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="WorkItem.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//------------------------------------------------------------------------------
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namespace System.Web.Util {
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using System.Runtime.InteropServices;
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using System.Security.Permissions;
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using System.Threading;
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//
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// Support for positing of work items to a different thread
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//
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/// <devdoc>
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/// <para>[To be supplied.]</para>
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/// </devdoc>
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public delegate void WorkItemCallback();
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/// <devdoc>
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/// <para>[To be supplied.]</para>
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/// </devdoc>
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public class WorkItem {
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private static bool _useQueueUserWorkItem = true;
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private static WaitCallback _onQueueUserWorkItemCompletion = new WaitCallback(OnQueueUserWorkItemCompletion);
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/// <devdoc>
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/// <para>[To be supplied.]</para>
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/// </devdoc>
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[SecurityPermission(SecurityAction.Demand, Unrestricted=true)]
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public static void Post(WorkItemCallback callback) {
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#if !FEATURE_PAL // ROTORTODO
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if (Environment.OSVersion.Platform != PlatformID.Win32NT)
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throw new PlatformNotSupportedException(SR.GetString(SR.RequiresNT));
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#else // !FEATURE_PAL
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throw new NotImplementedException("ROTORTODO");
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#endif // !FEATURE_PAL
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PostInternal(callback);
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}
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// assert to disregard the user code up the compressed stack
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[PermissionSet(SecurityAction.Assert, Unrestricted=true)]
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private static void CallCallbackWithAssert(WorkItemCallback callback) {
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callback();
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}
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private static void OnQueueUserWorkItemCompletion(Object state) {
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WorkItemCallback callback = state as WorkItemCallback;
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if (callback != null) {
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CallCallbackWithAssert(callback);
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}
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}
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internal static void PostInternal(WorkItemCallback callback) {
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if (_useQueueUserWorkItem) {
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ThreadPool.QueueUserWorkItem(_onQueueUserWorkItemCompletion, callback);
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}
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else {
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WrappedWorkItemCallback w = new WrappedWorkItemCallback(callback);
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w.Post();
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}
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}
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}
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internal class WrappedWorkItemCallback {
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private GCHandle _rootedThis;
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private WorkItemCallback _originalCallback;
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private WorkItemCallback _wrapperCallback;
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internal WrappedWorkItemCallback(WorkItemCallback callback) {
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_originalCallback = callback;
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_wrapperCallback = new WorkItemCallback(this.OnCallback);
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}
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internal void Post() {
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_rootedThis = GCHandle.Alloc(this);
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if (UnsafeNativeMethods.PostThreadPoolWorkItem(_wrapperCallback) != 1) {
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_rootedThis.Free();
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throw new HttpException(SR.GetString(SR.Cannot_post_workitem));
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}
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}
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private void OnCallback() {
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_rootedThis.Free();
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_originalCallback();
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}
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}
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}
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