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gh-138205: Remove the resize method on mmap object on platforms don't support it - #138276
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serhiy-storchaka
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Thank you for your PR, @aisk. Actually, I already had a patch, I just waited until other mmap issues were resolved. It is very similar to your PR, so let's continue with it.
Please update your PR, few new tests that use SystemError were added.
I think it is worth to add an entry in the "Porting to 3.15" section in What's New.
| @unittest.skipUnless(hasattr(mmap.mmap, 'resize'), 'requires mmap.resize') | ||
| def test_resize(self): | ||
| # Create a file to be mmap'ed. | ||
| f = open(TESTFN, 'bw+') |
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We can simply use with open(...) as f.
| f = open(TESTFN, 'rb') | ||
| try: |
| try: | ||
| m.resize(2*mapsize) | ||
| except SystemError: # resize is not universally supported | ||
| except AttributeError: # resize is not universally supported |
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- # Ensuring that readonly mmap can't be resized- try:- m.resize(2*mapsize)- except SystemError: # resize is not universally supported- pass- except TypeError:- pass- else:- self.fail("Able to resize readonly memory map")+ if hasattr(m, 'resize'):+ # Ensuring that readonly mmap can't be resized+ with self.assertRaises(TypeError):+ m.resize(2*mapsize)| try: | ||
| m.resize(512) | ||
| except SystemError: | ||
| except AttributeError: |
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Simply use if hasattr(m, 'resize').
- # Try resizing map- try:+ if hasattr(m, 'resize'):
m.resize(512)
- except SystemError:- pass- else:- # resize() is supported| return 0; | ||
| } | ||
| #endif /* defined(MS_WINDOWS) || defined(HAVE_MREMAP) */ |
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We usually write this simpler:
| #endif/* defined(MS_WINDOWS) || defined(HAVE_MREMAP) */ | |
| #endif/* MS_WINDOWS || HAVE_MREMAP */ |
| #endif /* UNIX */ | ||
| } | ||
| } | ||
| #endif /* defined(MS_WINDOWS) || defined(HAVE_MREMAP) */ |
| pagefile) will silently create a new map with the original data copied over | ||
| up to the length of the new size. | ||
| .. availability:: Linux, Windows |
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It is also available on other platforms (e.g. FreeBSD).
See how this is documented for madvise().
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b1241abCompareaisk
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Sep 3, 2025
Sorry for the force-push. I messed up the conflict resolution during the merge and had to redo the merge after the push. |
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Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
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Co-authored-by: Victor Stinner <vstinner@python.org>
Co-authored-by: Victor Stinner <vstinner@python.org>
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…orms don't support it (python#138276) Co-authored-by: Serhiy Storchaka <storchaka@gmail.com> Co-authored-by: Victor Stinner <vstinner@python.org>
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