What is it exactly that "triggers" Windows to mark a process as Not responding in the Task Manager and Resource Monitor?
+8
A:
The API behind this is IsHungAppWindow. Basically, if the application has not pumped a message within 5 seconds it can be marked as not responding.
Michael
2009-11-06 23:37:47
+5
A:
If a process does not collect Windows messages from its queue using the GetMessage function or something related, it will be tagged as "not responding" -- because it is not responding to user interface events.
This does not necessarily mean that the application is actually hung -- it may just be too busy to pay attention to the user.
Jeffrey Hantin
2009-11-06 23:38:10
+1
A:
Basically, it get's it self into a state where the program does not return to a point where it can process it's message queue.
Usually, this is either a loop that doesn't end or a blocking operation, such as reading from a socket, etc.
Dan McGrath
2009-11-06 23:38:39
Norton Antivirus frequently grabs my browser or my thunderbird email client and locks it into a not-responding. Its very annoying.
djangofan
2009-11-06 23:56:14
The amount of issues I have encountered that were caused by Norton products has given me psychological scarring
Dan McGrath
2009-11-07 00:10:30
thats why you use the new microsoft product or eset nod32 instead ;)
Svish
2009-11-07 01:52:04
+1
A:
The fact that they don't empty their message queue, by polling it GetMessge API and the like.
mjv
2009-11-06 23:38:40