DB.Close(): funlock error about bbolt HOT 7 CLOSED

It looks like this patch (my mistake) locked the wrong file descriptor.

Before the patch the file descriptor used was based on db.lockfile:
err := lockFileEx(syscall.Handle(db.lockfile.Fd()), flag, 0, 1, 0, &syscall.Overlapped{})

The patch factored it out of the loop, but based on db.file:
fd := db.file.Fd() ... err := lockFileEx(syscall.Handle(fd), flag, 0, 1, 0, &syscall.Overlapped{})

The file vs. lockfile subtlety seems to exist only on Windows, as the db struct definition tells.

I could happily patch it but I don't have anymore (and won't have for the coming months) a Windows platform to test it. But if you have one, let me know and we can do it together.

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I just modified bolt_windows.go at line 65, change fd := db.file.Fd() to fd := f.Fd() and it seems fixed @rgeronimi

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LGTM

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can you send a patch to fix this?

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@rgeronimi @xiang90 I have just create a pr #64

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fixed by #64

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Thks

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