On 05/19/2014 05:55 PM, Howard Chu wrote:
Hallvard Breien Furuseth wrote:Right... Though I can think of one non-kernel possibility:Previous process wrote something and got killed - maybe while fsyncing the changes. Then rapidly open and closed another mdb env - and close(sync descriptor) waits for the old changes to be synced in order to decide whether to return success or failure.That's nonsense. POSIX defines no such behavior for close(). In particular, close()'s success/failure result cannot depend on some other process's state.
There is no other process. The point would be that the system's only descriptor to a file with outstanding syncs is being closed. And I wasn't thinking of POSIX particular, just trying to think of reasons an OS might want to wait in close(). But "non-kernel" I said was wrong, more like it might be found in some spec and not just the source. Anyway, it was just a loose guess about what to look for, I'll survive being proved wrong:-) -- Hallvard