Red Hat Bugzilla – Bug 465392
race condition in XIM handling
Last modified: 2009-12-18 01:29:18 EST
Description of problem:
if one sends the key event to SCIM too much and too faster, the application, such as emacs and xterm freezes.
Version-Release number of selected component (if applicable):
always as long as it's on the above condition
Steps to Reproduce:
1.change the keyboard repeat setting to make this easier to see, like gconftool-2 -s -t int /desktop/gnome/peripherals/keyboard/delay 100 and gconftool-2 -s -t int /desktop/gnome/peripherals/keyboard/rate 110
2.open xterm with XMODIFIERS=@im=SCIM
3.keep pressing a key until it freezes
should handles it properly
What exactly happened on this race condition issue is: https://bugzilla.redhat.com/show_bug.cgi?id=452849#c19
Quote from XIM specification:
In on-demand-synchronous method, the IM library always receives XIM_FORWARD_EVENT or XIM_COMMIT message as a synchronous request. Also, the IM Server needs to synchronously process the correspondent reply from the IM library and the following XIM_FORWARD_EVENT message sent from the IM library when any of the event causes the IM Server to send XIM_FORWARD_EVENT or XIM_COMMIT message to the IM library, so that the input service is consistent. If the IM library gets the control back from the application after receiving the synchronous request, the IM library replies for the synchronous request before processing any of the events. In this time, the IM Server blocks XIM_FORWARD_EVENT message which is sent by the IM library, and handles it after receiving the reply. Howerver, the IM Server handles the other protocols /at any time/.
So in the case at the above URL, XIM server has to process XIM_SET_IC_VALUES regardless of waiting for XIM_SYNC_REPLY.
This bug appears to have been reported against 'rawhide' during the Fedora 10 development cycle.
Changing version to '10'.
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