Subj : Using Prf* routines in wi
To   : Ian Moote
From : Vitus Jensen
Date : Wed Jun 07 2000 05:55 pm

Moin Ian,

04.06.00 11:16, Ian Moote wrote a message to VITUS JENSEN:

HR>> VJ> Does anybody know whether Prf* routines are usable from
HR>> VJ> inside a
HR>> VJ> window proc? Do they block or violate the 1/10s rule in any
HR>> VJ> other way?

 IM> What's the "1/10's rule"? TIA and TTYL.

What's "TIA" and "TTYL"?

The "1/10's rule" is a rule of thumb when it comes to presentation manager 
programming.  It says that your window procedure should return within 0.1s to 
keep the user interface responsive.

The chosen interval comes from ancient ages when a 80486DX33 was a fast 
processor (and everyone used to those speeds) so today the rule should be 
formulated a little different.  Let's try it:

 "You should not spend a considerable amount of time inside the window 
procedure.  Don't use APIs which may block (as the duration of the block is not 
predictable in a multitasking system), don't access files or devices (access 
may fail and have a long timeout), and don't do lengthy operations (like 
filling a large listbox)."

By[t]e,
    Vitus

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