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https://issues.apache.org/jira/browse/GUACAMOLE-2061?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mike Jumper closed GUACAMOLE-2061.
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Resolution: Fixed
> guac_display_notify_user_moved_mouse() can block processing of "sync"
> ---------------------------------------------------------------------
>
> Key: GUACAMOLE-2061
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-2061
> Project: Guacamole
> Issue Type: Bug
> Components: libguac, RDP, VNC
> Affects Versions: 1.6.0
> Reporter: Mike Jumper
> Assignee: Mike Jumper
> Priority: Blocker
> Fix For: 1.6.0
>
>
> The {{guac_display_notify_user_moved_mouse()}} function necessarily locks the
> pending frame state, but this means that any current processing of the
> pending frame can potentially block the caller of
> {{guac_display_notify_user_moved_mouse()}}, typically the "mouse" instruction
> handler.
> Since instructions are handled in the order they are received, processing of
> other instructions like "sync" will be delayed. Delays in processing "sync"
> will be interpreted as client-side delays in _sending_ "sync" (this is the
> "processing lag" calculation), thus producing a feedback loop of increasing
> frame duration until updates slow to a crawl.
> Once things settle, updates resume as normal.
> Usage or implementation of {{guac_display_notify_user_moved_mouse()}} will
> need to be adjusted such that it cannot appreciably block processing of
> "sync".
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