[Webkit-unassigned] [Bug 142661] New: Introduce WTF::Atomic to wrap std::atomic for a friendlier CAS

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=142661

            Bug ID: 142661
           Summary: Introduce WTF::Atomic to wrap std::atomic for a
                    friendlier CAS
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mark.lam at apple.com

The CAS functions provided by std::atomic takes a reference to the expected value and modifies it if the CAS fails.  However, in a lot of our CAS usage, we don't want the expected value to change.  The solution to this is to provide a WTF::Atomic struct that wraps std::atomic, and provide CAS methods that won't alter the expected value if the CAS fails.

Also change CodeBlock, ByteSpinLock, and the DFG's crashLock to use WTF::Atomic instead of std::atomic.

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