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Unlinking Files on Windows
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This page is intended for developers.
This page describes what happens when Python's 'os.unlink(f)' is called on Windows.
1. File opened using Python's "open"
If the file f has been opened for reading by another process using Python's 'open(f)', then 'os.unlink(f)' will raise
WindowsError: [Error 32] The process cannot access the file because it is being used by another process: <f>
2. File opened using Mercurial's "posixfile"
If the file f has been opened for reading by another process with 'posixfile(f)', calling unlink will send that file into a "scheduled delete" state.
Scheduled delete has the following characteristics:
- (a) the entry in the directory for f is still kept
(b) calling 'fd = posixfile(f, 'w')' will raise 'IOError: [Errno 13] <f>: Access is denied'
Scheduled delete is left as soon as the other process closes the file.