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Callbacks are, by definition, parallel. I don't think there is a way to make them not parallel. What you can do is to set up a system of semaphores i.e. shared variables that block execution of the other thread until the one that is being processed finishes. Anyway, be careful when blocking callbacks, if you have a blocked callback and another message arrives, it will create another instance of your callback you will have two blocked callbacks.

Callbacks are, by definition, parallel. I don't think there is a way to make them not parallel. What you can do is to set up a system of semaphores i.e. shared variables that block execution of the other thread until the one that is being processed finishes. Anyway, be careful when blocking callbacks, if you have a blocked callback and another message arrives, it will create another instance of your callback and you will have two blocked callbacks.