Hi David, Yes, a similar mechanism to that used on POSIX is used on Windows. We use the file index and volume serial number to detect if a file is being re-opened, which should work on NTFS but has caveats on FAT-based systems. Keep in mind that this is only from the same process; we don't detect if files are open across processes. The upcoming 1.10.0 will include a file locking mechanism that should mitigate certain bad use cases like multiple processes opening a file for write access, though. That should work on Windows as well, though we are still in the process of generating a Win32 equivalent.
Dana Robinson Software Engineer The HDF Group From: Hdf-forum [mailto:[email protected]] On Behalf Of David Sent: Monday, November 16, 2015 12:46 PM To: HDF Users Discussion List <[email protected]> Subject: [Hdf-forum] Multiply Opened Files I found this in the reference manual about H5Fopen(): "In some cases, such as files on a local Unix file system, the HDF5 library can detect that a file is multiply opened and will maintain coherent access among the file identifiers" Does HDF5 maintain multi-open coherent access on Windows also? Ideally I'd like to have the file locked so that multiple opens are not possible but I can't figure out a way to do that on Windows. Something like the flock() method for Unix I've seen on this forum would be fine but I only see file locking available via CreateFile() in the Windows API. - David
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