[Webkit-unassigned] [Bug 248170] New: Listeners to MessagePort Postmessage() receive ArrayBuffer rather than SharedArrayBuffer

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=248170

            Bug ID: 248170
           Summary: Listeners to MessagePort Postmessage() receive
                    ArrayBuffer rather than SharedArrayBuffer
           Product: WebKit
           Version: Safari 16
          Hardware: Mac (Apple Silicon)
                OS: macOS 13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore JavaScript
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: d_a_stapleton at hotmail.com

1. Create a WebWorker that listens for messages using self.onmessage()
2. post the WebWorker a message port from the main thread
3. When the WebWorker receives a message port, listen to messages sent to it with port.OnMessage()
4. from the main thread, post a SharedArrayBuffer on the MessagePort.
5. Upon receiving the posted SharedArrayBuffer, the WebWorker will actually see an ArrayBuffer..

In my application I actually have multiple workers and allow communication between them using SharedArraybuffers that are posted on startup. This all works fine in Chrome, but unfortunately fails because of unwanted SharedArrayBuffer -> ArrayBuffer conversion in Safari.

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