Editing Programming language (section)

===Concurrency===
{{see also|Concurrent computing}}
In computing, multiple instructions can be executed simultaneously. Many programming languages support instruction-level and subprogram-level concurrency.{{sfn|Sebesta|2012|p=576}} By the twenty-first century, additional processing power on computers was increasingly coming from the use of additional processors, which requires programmers to design software that makes use of multiple processors simultaneously to achieve improved performance.{{sfn|Sebesta|2012|p=579}} [[Interpreted language]]s such as [[Python (programming language)|Python]] and [[Ruby (programming language)|Ruby]] do not support the concurrent use of multiple processors.{{sfn|Sebesta|2012|p=585}} Other programming languages do support managing data shared between different threads by controlling the order of execution of key instructions via the use of [[Semaphore (programming)|semaphore]]s, controlling access to shared data via [[monitor (synchronization)|monitor]], or enabling [[message passing]] between threads.{{sfn|Sebesta|2012|pp=585–586}}