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== History ==
The [[fork–join model]] from the 1960s, embodied by multiprocessing tools like [[OpenMP]], is an early example of a system ensuring all threads have completed before exit. However, Smith argues that this model is not true structured concurrency as the programming language is unaware of the joining behavior, and is thus unable to enforce safety.<ref>{{cite
The concept was formulated in 2016 by Martin Sústrik (creator of [[ZeroMQ]]) with his C library libdill, with [[Go_(programming_language)#Concurrency:_goroutines_and_channels|goroutines]] as a starting point.<ref>{{cite web |last1=Sústrik |first1=Martin |title=Structured Concurrency |url=http://250bpm.com/blog:71 |date=7 February 2016 |access-date=1 August 2019}}</ref> It was further refined in
In 2021, [[Swift (programming language)|Swift]] adopted structured concurrency.<ref>{{cite web |first1=John |last1=McCall |first2=Joe |last2=Groff |first3=Doug |last3=Gregor |first4=Konrad |last4=Malawski |access-date=3 March 2022 |title=Swift Structured Concurrency Proposal |website=Apple's Swift Evolution repo |publisher=GitHub |url=https://github.com/apple/swift-evolution/blob/main/proposals/0304-structured-concurrency.md}}</ref> Later that year, a draft proposal was published to add structured concurrency to [[Java (programming language)|Java]].<ref>{{cite web |last1=Pressler |first1=Ron |website=[[OpenJDK]] |publisher=Oracle |access-date=3 March 2022 |title=JEP draft: Structured Concurrency (Incubator) |url=https://openjdk.java.net/jeps/8277129}}</ref>
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