Original from  Mike Ruskai  to Denis Tonn on 11-16-1998
Original Subject: the PM message queue

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  DT> WinSendMsg is used to deliver the messages (events) to the 
  DT> application queue. WinSendMsg will cause a wait for the application to
  DT> return before continuing. 
  DT> There is also a WinPostMsg API call that does not "wait" but just 
  DT> places the event on the application's input queue and continues. PM 
  DT> does not use this API to deliver events to applications. 
 
  DT> Take a look at the PM programmer's reference and pay particular 
  DT> attention to the above 2 API's. That is the core of the whole 
  DT> difference between a synchronous and an asynchronous design. 
 
MR> It just occurred to me to ask.  Would it be possible to patch PM to use 
MR> WinPostMsg instead of WinSendMsg?  They both return four bytes, and take 
MR> the exact same parameters.
MR>  
MR> I'm sure there would be nasty side effects, but it'd be interesting to try.

 I already tried it (a long time ago). The "side effects" were 
immediate and far reaching.. IE: the system was totally broke.. 
 There are a lot of other places in PM that assume a synchronous 
model. It's not a simple "patch". 


   Denis       

 All opinions are my very own, IBM has no claim upon them
. 
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.
 

 



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