Waiting for all handles with MsgWaitForMultipleObjects is a bug waiting to happen

January 27, 2006 Jan 27, 2006 01/27/06

Raymond Chen

The MsgWaitForMultipleObjects and MsgWaitForMultipleObjectsEx functions allow you to specify whether you want to want for any or all of the handles (either by passing bWaitAll = TRUE or by passing dwFlags = MWMO_WAITALL, accordingly). But you never want to wait for all handles. Waiting for all handles means that the call does not return ...

Pumping messages while waiting for a period of time

January 26, 2006 Jan 26, 2006 01/26/06

Raymond Chen

We can use the MsgWaitForMultipleObjects function (or its superset MsgWaitForMultipleObjectsEx) to carry out a non-polling "sleep while processing messages". This function pumps messages for up to dwTimeout milliseconds. The kernel of the idea is merely to use the MsgWaitForMultipleObjects/Ex function as a surrogate for WaitMessageTimeout...

You can call MsgWaitForMultipleObjects with zero handles

January 25, 2006 Jan 25, 2006 01/25/06

Raymond Chen

There is no WaitMessageTimeout function, but you can create your own with the assistance of the MsgWaitForMultipleObjects function. To wait for a message with timeout, we use the MsgWaitForMultipleObjects in a vacuous sense: You pass it a list of objects you want to wait for, as well as a timeout and a set of queue states, asking that the ...