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GayleSaver

Image (Memory-Mapped) Files

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I was wondering...do you think Windows'' memory-mapped files (including your executable file and DLLs) are an advantage over other architectures? In my opinion, memory-mapped files are extremely important to any system. Not only are they easier to access, but also as an added benefit they can be randomly read from or written to without worrying about performance and extraneous function calls. The only disadvantage I''ve discovered is their fixed size property - you cannot resize an MMF without closing its handle and using standard Windows functions. Nevertheless, the MMF is, IMO, a very powerful tool. One other reason MMFs are useful: they permit based pointers and data (such as static or global variables in Windows programs) without much effort on the developer''s part and without wasting space or time. What do you think?

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Firstly, you speak of the feature as if other operating systems don''t have it available. This isn''t true. The function mmap() is widely available for this purpose for developers to use from within their own projects, but I don''t find it in Visual C++, as it happens. Only on other OSes... Check here for documentation.

I also don''t see what your point is regarding the static and global variables.

And I should also point out that the flat and shared nature of the ''dll space'' in Windows is known to be one of the primary reasons why the 3.1/9x line of OSes are not so stable as Linux, etc.

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