Takuma's Duplicate Display Check
Harold L Hunt II
Tue Mar 2 04:32:00 GMT 2004
Your duplicate display check in InitOutput.c seems correct to me.
The only question I have is if the mutex allocated by CreateMutex is
visible by XWin.exe running under a different session on Terminal Services.
Oops, I just looked it up and answered my own question:
Terminal Services: The name can have a "Global\" or "Local\" prefix to
explicitly create the object in the global or session name space. The
remainder of the name can contain any character except the backslash
character (\). For more information, see Kernel Object Namespaces.
Windows XP: Fast user switching is implemented using Terminal Services
sessions. The first user to log on uses session 0, the next user to log
on uses session 1, and so on. Kernel object names must follow the
guidelines outlined for Terminal Services so that applications can
support multiple users.
Windows 2000: If Terminal Services is not running, the "Global\" and
"Local\" prefixes are ignored. The remainder of the name can contain any
character except the backslash character.
Windows NT 4.0 and earlier: The name can contain any character except
the backslash character.
Windows 95/98/Me: The name can contain any character except the
backslash character. The empty string ("") is a valid object name.
We can easily add "Global\" to the name, but I think we have to have a
way to detect that the NT version is greater than 4.0, since it sounds
like CreateMutex may fail on Windows 95/98/Me/NT 4.0 if you pass it a
"\" in the name.
I am going to add the "Global\" to CVS... and possibly a way to make
sure that "Global\" is only prepended for NT > 4.0.
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