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echo: os2prog
to: Phil Crown
from: Eelco Dolstra
date: 1996-01-21 15:19:08
subject: WinPostMsg

Hello Phil!

On 16-01-96 18:02 Phil Crown wrote to Eelco Dolstra:

 PC> However, this may block the Object windows queue for quite 
 PC> sometime.

 PC> Do I not have to worry about blocking an Object windows queue as 
 PC> I do the main thread's queue?

No, not if you post the message to the object window. However, I think that
if you *send* the message, it will block the sending thread (in this case
the main thread). So you should always use WinPostMsg.

 PC> Or should I have the Object Window Procedure start another thread 
 PC> to do time consuming tasks?

That is also possible, but starting a new thread has a "non-trivial
overhead" (according to IBM). It is probably better to have object
window threads for all the tasks your application will ever need to do, and
start them all at once at program start-up (like PMSHELL.EXE does, which
has more than 20 threads).

Eelco.

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