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I didn't read the whole issue, but the following code makes sense.
+try:
+ import posix
+except ImportError:
+ # Windows has nanosecond utime resolution.
+ UTIME_EPSILON = 2e-9
+else:
+ import sysconfig
+ if 'HAVE_UTIMENSAT' in posix._have_functions:
+ UTIME_EPSILON = 2e-9
+ elif 'HAVE_UTIMES' in sysconfig.get_config_vars():
+ UTIME_EPSILON = 2e-6
+ else:
+ UTIME_EPSILON = 1.0
Windows doesn't really have nanosecond resolution: the common Windows unit is 100 ns. See GetFileInformationByHandle() documentation: its BY_HANDLE_FILE_INFORMATION structure has FILETIME fields, and FILETIME uses the 100 ns unit.
We might expose this unit (UTIME_EPSILON, in the os module maybe?) as we done for time function with time.get_clock_info().