[Webkit-unassigned] [Bug 79864] New: RefCounted::deprecatedTurnOfVerifier() should not be deprecated

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=79864

           Summary: RefCounted::deprecatedTurnOfVerifier() should not be
                    deprecated
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: fpizlo at apple.com


It is necessary to call this in the constructor of many objects in JavaScriptCore, because JavaScriptCore objects may be used from multiple threads even if the reference counting is done in a racy manner. This is because a JSC instance may be used from multiple threads so long as all accesses into that instance are protected by a per-instance lock. It would be absolutely wrong to prohibit this pattern, and it would be a disastrous regression to requite that the objects within that instance use a thread-safe version of reference counting.

Hence the notion that this method should be deprecated is entirely misguided until a credible, low-overhead verifier is implemented, which can understand JavaScriptCore's well-designed thread safety patterns while also not created confusing noise in our code base.

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