is os.Rename an atomic system level operation?

[Isaac Mosquera]

is os.Rename an atomic system level operation?

[Rob Pike]

No.

-rob

[Isaac Mosquera]

If not rename, what is the recommended approach for an atomic move?

[Matt Harden]

On Linux it is, though only for local filesystems. See http://man7.org/linux/man-pages/man2/rename.2.html.

[John Nagle]

On Windows Vista and later, Win32 ReplaceFile.

http://msdn.microsoft.com/en-us/library/windows/desktop/aa365512%28v=vs.85%29.aspx

This is atomic for moves within an NTFS file system, which have
an internal transaction journal, but not for FAT file systems or
networked file systems.

For a general discussion of file operation atomicity on Windows see

http://msdn.microsoft.com/en-us/library/windows/desktop/hh802690%28v=vs.85%29.aspx#applications_updating_a_single_file_with_document-like_data

John Nagle

[Thomas Bushnell, BSG]

Huh? On Posix systems, at least, it's syscall.Rename, which is required by Posix to be atomic.

I can't speak to other systems at all.

On Mon, Oct 7, 2013 at 4:50 PM, Rob Pike <r...@golang.org> wrote:

No.

-rob

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[Rob Pike]

There are systems where it cannot be done atomically, therefore it is not atomic.

-rob