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    <p>This is called <strong>IIS Life Cycle</strong><br> The fully details must be direct read from Microsoft and the creators of the IIS.<br> Is not the same for all IIS.</p> <p><a href="http://msdn.microsoft.com/en-us/library/bb470252(v=vs.100).aspx" rel="nofollow noreferrer">Life Cycle Overview for IIS 7.0</a></p> <p><a href="http://msdn.microsoft.com/en-us/library/ms178473(v=vs.100).aspx" rel="nofollow noreferrer">Life Cycle Overview for IIS 5.0 and 6.0</a></p> <p>and there are more if you search on internet.</p> <blockquote> <p>do they all get a separate instance of the app or do they use the same one </p> </blockquote> <p>If you use many pools for the same application <a href="https://www.microsoft.com/technet/prodtechnol/WindowsServer2003/Library/IIS/659f2e2c-a58b-4770-833b-df96cabe569e.mspx?mfr=true" rel="nofollow noreferrer">(web garden)</a> then they the request are split among the pools, or else one pool, one instance is take care to process the page.</p> <p>The page can be processing from different threads, but there is a global lock on the session, so if you use the MS session the page will processing in serial (expect the one that did not use session)</p> <p>Each pool is one instance that hold the static data, and is the same for all request from that pool. If you use two pools you have two different sets of static data.</p> <p>Some questions about session lock: <a href="https://stackoverflow.com/questions/11325150/trying-to-make-web-method-asynchronous">Trying to make Web Method Asynchronous</a> , <a href="https://stackoverflow.com/questions/9426673/web-app-blocked-while-processing-another-web-app-on-sharing-same-session">Web app blocked while processing another web app on sharing same session</a></p>
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    1. POWhat actually happens in IIS when I load my URL?
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    1. POWhat actually happens in IIS when I load my URL?
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    1. COThank you for the good answer, the web garden looks interesting.. how you manage something that needed to be a singleton across the web garden? some sort of inmemory shared object maybe?
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    2. CO@Steoates I have only found practical working the solution of a common database. Maybe there is and a shared object but did not look so much, not have it found yet. For synchronization among pools I use the `Mutex`, for synchronization among static thread data on the same pool I use the `lock`. I also have write my totally custom session module to avoid the lock and let my page running asynchronous.
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