Thus wiggling the mouse causes the application to process I/O messages faster, and install quicker. However, it does wake the application for user input, presumably to keep it feeling responsive, and when the application is awake it will handle any pending I/O messages too. By sleeping they allow other applications to run, rather than wasting CPU time endlessly asking if the file operation has completed yet.įor reasons that are not entirely clear, but probably due to performance problems on low end machines, Windows 95 tends to bundle up the messages about I/O completion and doesn't immediately wake up the application to service them. Windows 95 applications often use asynchronous I/O, that is they ask for some file operation like a copy to be performed and then tell the OS that they can be put to sleep until that operation finishes. This is because of a flaw in the way Windows 95 generates events, and the fact that many applications are event driven.
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