[Webkit-unassigned] [Bug 115875] New: add atomicAdd and atomicSubtract

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=115875

           Summary: add atomicAdd and atomicSubtract
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Minor
          Priority: P3
         Component: Web Template Framework
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: achristensen at apple.com
                CC: paroga at paroga.com, msaboff at apple.com


Source/WTF/wtf/Atomics.h currently has atomicIncrement and atomicDecrement for adding and subtracting 1 atomically, but there is no way to add and subtract other values atomically using WTF.  This is needed in cases like Source/WTF/wtf/text/StringImpl.h line 584, which increments a value by 2.

I added atomicAdd and atomicSubtract and tested it on Mac, but I'd prefer someone try this on Windows before reviewing in case I forgot something Windows-specific.

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