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Posted 11 Dec 2008

Timeout Functions

, 11 Dec 2008
This article explains about executing a function within a time limit. Also includes a helper class which helps to implement timeout functions easily. This article deals with running multiple timeout processes each with time limit.
namespace TimeoutFunctions.Workers
    using System;
    using System.Collections.Generic;
    using System.Threading;

    internal class AsyncTimeoutWorker : BaseWorker
        /// <summary>
        /// Fires when async process finishes or timedout
        /// </summary>
        public event EventHandler<AsyncProcessEventArgs> AsyncProcessCompleted = null;
        int asyncProcessCount = 0;

        /// <summary>
        /// Returns TRUE if any async processes are executing
        /// </summary>
        public bool IsAsyncProcessExecuting {
            get { return asyncProcessCount != 0; }

        /// <summary>
        /// Gets number of asynchronous processes currently executing
        /// </summary>
        public int AsyncProcessCount {
            get { return asyncProcessCount; }

        public override bool Start(DataCarrier dataCarrier) {
            return ThreadPool.QueueUserWorkItem(StartAsyncProcess, dataCarrier);

        void StartAsyncProcess(object state) {
            DataCarrier data = state as DataCarrier;
            WaitCallback methodToExecute = data.MethodToExecute;
            Thread asyncWorker = new Thread(delegate(object obj)
                base.ExecuteMethod(data.UserState, methodToExecute);
            asyncWorker.IsBackground = true;
            bool success = asyncWorker.Join(data.TimeOut);
            AsyncProcessEventArgs args = new AsyncProcessEventArgs(data.UserState, success);
            if (!success)
                ProcessTimeout(asyncWorker, args, data.TimeOut);

        void OnAsyncProcessCompleted(AsyncProcessEventArgs args) {
            if (AsyncProcessCompleted != null)
                AsyncProcessCompleted(this, args);

        void ProcessTimeout(Thread thread, AsyncProcessEventArgs args, TimeSpan abortWait) {
            // waiting for specified time to abort. Default is 1 second
            if (!thread.Join(abortWait)) {
                // thread won't end
                args.IsThreadRunning = true;
                args.AsyncWorker = thread;

        void IncrementAsyncProcessCount() {
            Interlocked.Increment(ref asyncProcessCount);

        void DecrementAsyncProcessCount() {
            Interlocked.Decrement(ref asyncProcessCount);

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About the Author

N a v a n e e t h
Software Developer ThoughtWorks
India India
Call me Navaneeth Some years ago--never mind how long precisely, I was doing programs with C and C++. When .NET came, I started with C#,ASP.NET and SQL Server.

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