Formerly, in some societies, only men could become actors, and women's roles were generally played by men or boys.  [ when? ] When used for the stage, women occasionally played the roles of prepubescent boys.  [ when? ]
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The actor model in computer science is a mathematical model of concurrent computation that treats "actors" as the universal primitives of concurrent computation. In response to a message that it receives, an actor can: make local decisions, create more actors, send more messages, and determine how to respond to the next message received. Actors may modify their own private state , but can only affect each other through messages (avoiding the need for any locks ).