[issue12562] calling mmap twice fails on Windows
Piotr Zolnierczuk piotr.zolnierc...@gmail.com added the comment: OK. I will work around it. I was using 'mapping object of a specified size that is backed by the system paging file instead of by a file in the file system' - map-handle == INVALID_HANDLE_VALUE (-1), i.e. shared memory for inter-process communication (not my choice) A use case was when all process were stopped and one wanted to start fresh using the same tag but with a bigger size. BTW, here's the result of the following script in Python 2.5 import mmap map1 = mmap.mmap(fileno=-1, tagname='MyData', length=4096) map1[0] = 'a' map1[4095]='b' print len(map1), map1[0], map1[4095] 4096 a b map2 = mmap.mmap(fileno=-1, tagname='MyData', length=8192) print len(map2), map2[0], map2[4095] 8192 a b which would indicate that it does 'resize' and preserves the data. which means t -- status: pending - open ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue12562 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue12562] calling mmap twice fails on Windows
Piotr Zolnierczuk piotr.zolnierc...@gmail.com added the comment: Just looked into my partner C++ code and he's using it very much like in Python 2.5: m_obj-map_handle = CreateFileMapping (INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, pageSize, tagName); m_obj-data = (char *) MapViewOfFile (m_obj-map_handle, FILE_MAP_ALL_ACCESS, 0, 0, 0); -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue12562 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue2733] mmap resize fails on anonymous memory
Piotr Zolnierczuk piotr.zolnierc...@gmail.com added the comment: I wonder if this is related to the problem I reported about two weeks ago http://bugs.python.org/issue12562? -- nosy: +zolnie ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue2733 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue12562] calling mmap twice fails on Windows
New submission from Piotr Zolnierczuk piotr.zolnierc...@gmail.com: Hi, I am trying to migrate from Python 2.5 to Python 2.7 I found though the mmap behaves differently on Windows XP between the two versions. It boils down to the following code: import mmap map1 = mmap.mmap(fileno=0, tagname='MyData', length=4096) map2 = mmap.mmap(fileno=0, tagname='MyData', length=8192) It runs fine (so I can resize shared memory) on XP with 2.5.4, but when running on 2.7.2 I get the following error Traceback (most recent call last): File D:\Workspace\memmap_test.py, line 3, in module map2 = mmap.mmap(fileno=0, tagname='MyData', length=8192) WindowsError: [Error 5] Access is denied -- messages: 140349 nosy: zolnie priority: normal severity: normal status: open title: calling mmap twice fails on Windows versions: Python 2.7 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue12562 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue12562] calling mmap twice fails on Windows
Changes by Piotr Zolnierczuk piotr.zolnierc...@gmail.com: -- components: +Windows type: - behavior ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue12562 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
