[Webkit-unassigned] [Bug 161893] New: ParkingLot is going to have a bad time with threads dying

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=161893

            Bug ID: 161893
           Summary: ParkingLot is going to have a bad time with threads
                    dying
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Template Framework
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fpizlo at apple.com

If a thread dies right as it falls out of parkConditionally, then unparkOne() and friends might die because they will dereference a deallocated ThreadData.

The solution is to ref-count ThreadData's.  When unparkOne() and friends want to hold onto a ThreadData past the queue lock, they can +1 the ref count.

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