#7473: getModificationTime gives only second-level resolution
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Reporter: duncan | Owner:
Type: bug | Status: new
Priority: normal | Milestone: 7.8.1
Component: libraries/directory | Version: 7.6.1
Resolution: | Keywords:
Operating System: Unknown/Multiple | Architecture:
Type of failure: None/Unknown | Unknown/Multiple
Test Case: | Difficulty: Unknown
Blocking: | Blocked By:
| Related Tickets:
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Changes (by NeilMitchell):
* cc: ndmitchell@… (added)
Comment:
The {{{GetFileAttributesEx}}} function on Windows returns resolution of
100ns, but if you repeatedly write to a file and read modification times
under Windows you will see it change in granularity of 1s, as the Windows
NTFS file system omits any modification time update if one was already
done in the last second. As a result, {{{getModificationTime}}} isn't
going to have the resolution you are after on Windows, even with the new
function. I have verified this experimentally on both a Windows XP laptop
and a Windows Vista desktop.
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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7473#comment:10>
GHC <http://www.haskell.org/ghc/>
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