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    <p>EDIT: This was written prior to .NET 4 being released, when obviously there's <code>ConcurrentDictionary</code>. I'm leaving it here as a reference for those needing .NET 3.5.</p> <p>I don't know of any equivalent to <code>ConcurrentHashMap</code>.</p> <p>In terms of general concurrency utilities - .NET has always provided a bit more than the basics which Java used to provide, in terms of <a href="http://msdn.microsoft.com/en-us/library/system.threading.mutex.aspx" rel="nofollow noreferrer"><code>Mutex</code></a>, <a href="http://msdn.microsoft.com/en-us/library/system.threading.manualresetevent.aspx" rel="nofollow noreferrer"><code>ManualResetEvent</code></a>, <a href="http://msdn.microsoft.com/en-us/library/system.threading.autoresetevent.aspx" rel="nofollow noreferrer"><code>AutoResetEvent</code></a> and <a href="http://msdn.microsoft.com/en-us/library/system.threading.readerwriterlock.aspx" rel="nofollow noreferrer"><code>ReaderWriterLock</code></a>; then more recently (.NET 2.0) <a href="http://msdn.microsoft.com/en-us/library/system.threading.semaphore.aspx" rel="nofollow noreferrer"><code>Semaphore</code></a> and (.NET 3.5) <a href="http://msdn.microsoft.com/en-us/library/system.threading.readerwriterlockslim.aspx" rel="nofollow noreferrer"><code>ReaderWriterLockSlim</code></a> - as well as the process-wide thread pool, of course.</p> <p>A bigger shake-up will come in .NET 4.0 when Parallel Extensions arrives - that should make concurrency <em>much</em> simpler. Likewise the <a href="http://channel9.msdn.com/pdc2008/TL55/" rel="nofollow noreferrer">Coordination and Concurrency Runtime</a> is finally breaking free of the shackles of the Microsoft Robotics Studio, although I'm not clear on exactly where it's headed (whether it'll be part of .NET itself, or a separate library).</p>
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    1. PODoes .NET have a Dictionary implementation that is equivalent to Java's ConcurrentHashMap?
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    1. USJon Skeet
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    1. COI was under the impression (from public MSDN blogs) that it was destined to be a core part of .NET 4.0 itself.
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      1. USMarc Gravell
    2. COThanks for you answer Jon. Parallel Extensions looks very interesting. Just to be clear - I am not trolling - this is not a "Java has better libraries than .net" rant. Am just new to .net and keen to see what is available out of the box.
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    3. COMarc: The CCR as part of .NET 4.0? Links would be welcome! Serg: Don't worry, I didn't take it that way :)
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