[zeromq-dev] [PATCH][czmq] Update clock support on Windows

[Steven McCoy]

#1 Check Windows build version as to whether Sleep(*0ms*) yields or sleeps.
#2 Use GetSystemTimeAsFileTime() instead of GetSystemtime().

I don't know if SdkDdkver.h needs to be explicitly brought in, the WINVERand
_WIN32_WINNT symbols are broken for detecting Windows Server 2003.

http://msdn.microsoft.com/en-us/library/aa383745.aspx

Noting that zclock_log isn't very useful with buffered output.  Also it uses
three expensive output calls which need to be reduced if you ever direct to
disk whilst HDDs remain popular.

-- 
Steve-o
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