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PONon-blocking wait without TPL in 3.5
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12584803
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CreationDate
2012-09-25T14:11:34.467
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2012-09-25T20:24:49.313
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2012-09-25T20:24:49.313
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1453867
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Body
<p>How can I perform wait without blocking thread and without TPL' ContinueWith? For ex. in 3.5? I know about TPL's ported version for 3.5 (by RX team), but i'm curious to know - which threading primitives I can use for that (... what is behing the scenes of TPL). And what ContinueWith alternatives in TPL?</p> <p>// will this handler block thread during async IO operation?</p> <pre><code>public class AsyncHandler : IHttpAsyncHandler { public void ProcessRequest(HttpContext ctx) { // not used } public bool IsReusable { get { return false; } } public IAsyncResult BeginProcessRequest(HttpContext ctx, AsyncCallback cb, object obj) { AsyncRequestState reqState = new AsyncRequestState(ctx, cb, obj); AsyncRequest ar = new AsyncRequest(reqState); ThreadStart ts = new ThreadStart(ar.ProcessRequest); Thread t = new Thread(ts); t.Start(); return reqState; } public void EndProcessRequest(IAsyncResult ar) { AsyncRequestState ars = ar as AsyncRequestState; if (ars != null) { // Some cleanup } } } class AsyncRequestState : IAsyncResult { public AsyncRequestState(HttpContext ctx, AsyncCallback cb, object extraData) { _ctx = ctx; _cb = cb; _extraData = extraData; } internal HttpContext _ctx; internal AsyncCallback _cb; internal object _extraData; private bool _isCompleted = false; private ManualResetEvent _callCompleteEvent = null; internal void CompleteRequest() { _isCompleted = true; lock (this) { if (_callCompleteEvent != null) _callCompleteEvent.Set(); } if (_cb != null) _cb(this); } public object AsyncState { get { return (_extraData); } } public bool CompletedSynchronously { get { return (false); } } public bool IsCompleted { get { return (_isCompleted); } } public WaitHandle AsyncWaitHandle { get { lock (this) { if (_callCompleteEvent == null) _callCompleteEvent = new ManualResetEvent(false); return _callCompleteEvent; } } } } class AsyncRequest { private AsyncRequestState _asyncRequestState; public AsyncRequest(AsyncRequestState ars) { _asyncRequestState = ars; } public void ProcessRequest() { //calling webservice or executing sql command asynchronously AsyncIOOperationWithCallback(state => { ((AsyncRequestState)state.Context)._ctx.Response.Write("Operation completed"); _asyncRequestState.CompleteRequest(); }, _asyncRequestState); } } </code></pre>
Tags
<c#><asynchronous><task-parallel-library><wait>
Title
Non-blocking wait without TPL in 3.5
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