void ScriptLoader::handleSourceAttribute(const String& sourceUrl)
{
    if (ignoresLoadRequest() || sourceUrl.isEmpty())
        return;

    prepareScript(); // FIXME: Provide a real starting line number here.
}

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.