How to synchronize flow after sending two asynchrono开发者_如何学运维us messages?
There isn't an explicit construct for this in sequence diagrams afaik. You would have to annotate the diagram with a comment/constraint to indicate the need for synchronisation before further action.
Have you considered an Activity Diagram? They have specific notation for parallelism & synchronisation.
 
         
                                         
                                         
                                         
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