RESOLVED INVALID 51352
Web process should only spin a run loop while waiting for replies to synchronous messages that invoke UI 
https://bugs.webkit.org/show_bug.cgi?id=51352
Summary Web process should only spin a run loop while waiting for replies to synchron...
Adam Roben (:aroben)
Reported 2010-12-20 13:23:25 PST
As described in bug 51351, having the UI process respond to synchronous messages from the web process on the main thread can result in deadlocks when windowed plugins are involved. We're going to move all synchronous message processing off the main thread by default in the UI process. But synchronous messages that result in needing to display UI (e.g., WebPageProxy::RunJavaScriptAlert) require doing so on the main thread. In those cases, the web process will need to spin a run loop while waiting for the message reply to avoid the kinds of deadlocks described in bug 51351.
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Adam Roben (:aroben)
Comment 1 2010-12-20 13:25:05 PST
<rdar://problem/8790537>
Adam Roben (:aroben)
Comment 2 2011-01-26 18:10:29 PST
As described in bug 51351 comment 4, we're going to spin a run loop while waiting for a reply to all synchronous messages. Once bug 51351 is fixed we'll only spin a run loop while waiting for replies to synchronous messages that present UI in the UI process.
Adam Roben (:aroben)
Comment 3 2011-04-11 09:08:56 PDT
(In reply to comment #2) > As described in bug 51351 comment 4, we're going to spin a run loop while waiting for a reply to all synchronous messages. Bug 58239 now covers this strategy. > Once bug 51351 is fixed we'll only spin a run loop while waiting for replies to synchronous messages that present UI in the UI process. We'll continue to use this bug to track this future improvement.
Anders Carlsson
Comment 4 2015-06-18 14:56:35 PDT
We got rid of WK2 for Windows so this no longer applies.
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