April 2025
Intermediate to advanced
324 pages
7h 35m
Portuguese (Portugal, Brazil)
Content preview from Programando o TypeScript
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Capítulo 8. Programação Assíncrona, Concorrência e Paralelismo
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Até agora, neste livro, lidamos principalmente com programas síncronos - programas que recebem alguma entrada, fazem algumas coisas e são executados até a conclusão em uma única passagem. Mas os programas realmente interessantes - os blocos de construção de aplicativos do mundo real que fazem solicitações de rede, interagem com bancos de dados e sistemas de arquivos, respondem à interação do usuário, descarregam o trabalho intensivo da CPU para threads separadas - todos fazem uso de APIs assíncronas como callbacks, promises e streams.
Essas tarefas assíncronas são onde o JavaScript realmente brilha e se diferencia de outras linguagens multithread convencionais, como Java e C++. Motores JavaScript populares como o V8 e o SpiderMonkey fazem com uma thread o que tradicionalmente exigia muitas threads, sendo inteligentes e multiplexando tarefas numa única thread enquanto outras tarefas estão inativas. Este ciclo de eventos é o modelo de thread padrão para motores JavaScript, e aquele que assumimos que estás a usar. Do ponto de vista do utilizador final, normalmente não importa se o teu motor usa um modelo de ciclo de eventos ou um modelo multithread, mas isso afecta as explicações que vou dar sobre como as coisas funcionam e porque desenhamos as coisas da forma que fazemos.
Este modelo de concorrência ...
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