void ScriptLoader::execute(ScriptResource* resource)
{
    ASSERT(!m_willBeParserExecuted);
    ASSERT(resource);
    if (resource->errorOccurred()) {
        dispatchErrorEvent();
    } else if (!resource->wasCanceled()) {
        executeScript(ScriptSourceCode(resource));
        dispatchLoadEvent();
    }
    resource->removeClient(this);
}

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.