bpo-40915: Fix mmap resize bugs on Windows (GH-29213)#29213

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tjguk merged 11 commits into

python:mainfrom

tjguk:issue40915-mmap-resize

Oct 26, 2021

Commits on Oct 23, 2021

On Windows, if a named mmap section is held by more than one handle, no handle can be resized
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Commits on Oct 24, 2021

A pagefile-backed mmap can now be resized (under the cover it's being recreated along with its data)
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Merge branch 'main' into issue40915-mmap-resize
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Make sure that resizing includes the offset when calculating the new file extent
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Commits on Oct 25, 2021

Add & tweak resize tests for Windows:
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Add useful commentary to the new resize logic
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Add some tentative docs to reflect the new changes
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Add a specific test to check that resizing a named mapping fails with an exception but retains the mapping
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Commits on Oct 26, 2021

Use the existing `error` value as `GetLastError` might return a different value by this point
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Be specific about the exception type raised
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Pick up an error when resizing the file even if everything else succeeds
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