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c++x11xlib

Remove Extra Expose Messages From X11 Queue

I have a program that has a thread that generates Expose messages using XSendEvent. A second thread receives the Expose messages along with other messages (mainly input handling). The problem is that the sending thread sends the Expose messages at a constant rate (~60Hz) but the receiving thread may be rendering slower than that. The X11 queue will get bogged down with extra Expose messages, and any input handling messages will start fall way behind all those extra Expose messages.

In Windows, this is not a problem because Windows will automatically coalesce all WM_PAINT messages into a single message. Is there any way to do this in X11, or some other way to solve this problem?

Solution

  • You can very easily coalesce any kind of event yourself with XCheckTypedEvent() and friends.