PostMessage seems be blocked by other Window's operation

Question

Hi,

It happens only on Windows XP, the Windows API PostMessage will be blocked during maximum or minimum a window of another application. It takes more than 200ms. I've set priority of my application to High. There's no problem on Windows Vista or Windows 7. Any hints how to solve this problem?

Yun

Answer 1

If that's a problem then call PostMessage from additional thread.

Answer 2

Wait a minute... IIRC, PostMessage has always been a non-blocking call. It "posts" and returns immediately. I believe I've tested this in the past. (I'm still waking up so could be wrong.)

If I'm right, there is something else giving the appearance of PostMessage blocking.

Answer 3

Since it's a normal behavior of Window OS, I've managed not to call any graphics related API. Thank you