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using System;
using System.Collections.Generic;
using System.Threading;
using Pfz.Caching;
namespace Pfz.Threading
{
/// <summary>
/// Class that creates a thread to run Actions as messages. It only creates
/// one thread to process all messages. Use it only when you know you want to
/// process many messages asynchronously, but don't want (or can't) use ThreadPool
/// threads.
/// <typeparam name="T">The type of the actions this executor invokes.</typeparam>
/// </summary>
public sealed class ActionRunner<T>:
ThreadSafeDisposable
{
private ManualResetEvent fManualResetEvent = new ManualResetEvent(false);
private volatile Queue<KeyValuePair<Action<T>, T>> fQueue = new Queue<KeyValuePair<Action<T>, T>>();
/// <summary>
/// Creates a new action runner.
/// </summary>
public ActionRunner()
{
try
{
GCUtils.Collected += p_Collected;
UnlimitedThreadPool.Run(p_Run);
}
catch
{
Dispose();
throw;
}
}
/// <summary>
/// Frees all used resources.
/// </summary>
/// <param name="disposing"></param>
protected override void Dispose(bool disposing)
{
if (disposing)
{
fManualResetEvent.Set();
GCUtils.Collected -= p_Collected;
}
base.Dispose(disposing);
}
private void p_Collected()
{
try
{
AbortSafe.Lock
(
DisposeLock,
delegate
{
if (WasDisposed)
{
GCUtils.Collected -= p_Collected;
return;
}
fQueue = new Queue<KeyValuePair<Action<T>, T>>(fQueue);
}
);
}
catch
{
}
}
private void p_Run()
{
var thread = Thread.CurrentThread;
while(true)
{
thread.IsBackground = true;
fManualResetEvent.WaitOne();
thread.IsBackground = false;
while(true)
{
KeyValuePair<Action<T>, T> pair = new KeyValuePair<Action<T>,T>();
bool mustBreak = false;
bool mustReturn = false;
AbortSafe.UnabortableLock
(
DisposeLock,
delegate
{
if (WasDisposed)
{
fManualResetEvent.Close();
mustReturn = true;
return;
}
var queue = fQueue;
if (queue.Count == 0)
{
fManualResetEvent.Reset();
mustBreak = true;
return;
}
pair = queue.Dequeue();
}
);
if (mustReturn)
return;
if (mustBreak)
break;
pair.Key(pair.Value);
}
}
}
/// <summary>
/// Runs the given action.
/// </summary>
/// <param name="action">The action to run.</param>
/// <param name="value">The value for the given action.</param>
public void Run(Action<T> action, T value)
{
if (action == null)
throw new ArgumentNullException("action");
AbortSafe.UnabortableLock
(
DisposeLock,
delegate
{
CheckUndisposed();
var pair = new KeyValuePair<Action<T>, T>(action, value);
fQueue.Enqueue(pair);
}
);
fManualResetEvent.Set();
}
}
}
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I started to program computers when I was 11 years old, as a hobbyist, programming in AMOS Basic and Blitz Basic for Amiga.
At 12 I had my first try with assembler, but it was too difficult at the time. Then, in the same year, I learned C and, after learning C, I was finally able to learn assembler (for Motorola 680x0).
Not sure, but probably between 12 and 13, I started to learn C++. I always programmed "in an object oriented way", but using function pointers instead of virtual methods.
At 15 I started to learn Pascal at school and to use Delphi. At 16 I started my first internship (using Delphi). At 18 I started to work professionally using C++ and since then I've developed my programming skills as a professional developer in C++ and C#, generally creating libraries that help other developers do their work easier, faster and with less errors.
Want more info or simply want to contact me?
Take a look at:
http://paulozemek.azurewebsites.net/
Or e-mail me at: paulozemek@outlook.com
Codeproject MVP 2012, 2015 & 2016
Microsoft MVP 2013-2014 (in October 2014 I started working at Microsoft, so I can't be a Microsoft MVP anymore).