[Webkit-unassigned] [Bug 51352] New: Web process needs to spin a run loop while waiting for replies to synchronous messages that invoke UI

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=51352

           Summary: Web process needs to spin a run loop while waiting for
                    replies to synchronous messages that invoke UI
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: NeedsRadar
          Severity: Normal
          Priority: P2
         Component: New Bugs
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: aroben at apple.com
                CC: andersca at apple.com, sam at webkit.org


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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