September 2024
Intermediate to advanced
138 pages
2h 54m
Spanish
Content preview from Aprender programación funcional
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Capítulo 6. Cuestiones de concurrencia
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Voy a empezar este capítulo con una frase que suena un poco mística: sin mutación de estado, podemos ignorar el tiempo.
Desgranemos esto. En primer lugar, ¿qué tiene que ver el tiempo con la mutación de estado, o con la programación en realidad? El tiempo entra en la programación cuando tenemos un conjunto de procesos que deben ejecutarse en un orden determinado.
Consideremos el siguiente ejemplo.1 Considera dos funciones. La primera lleva x ax + 1. La segunda lleva x a x × x. Pongamos x a 10. Ahora imaginemos que se ejecutan estas dos funciones en paralelo. ¿Cuál sería la respuesta? ¿Te sorprendería que hubiera cinco posibles respuestas correctas? Desglosemos esto. P1 = x → x × x y P2 = x → x + 1:
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Si P1 pone x a 100 y luego P2 pone 100 a 101, obtenemos 101.
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Si P2 pone x a 11 y luego P1 pone 11 a 121, obtenemos 121.
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P2 cambia 10 por 11 entre las dos veces que P1 accede al valor de x durante la evaluación de x × x. En este caso, obtenemos 110.
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P2 accede a x. Luego P1 fija x en 100. Luego P2 fija x. Esto da 10.
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P1 accede a x dos veces. Luego P2 pone x a 11. Luego P1 fija x. Esto da 100.
¿Cuál es la respuesta correcta? ¿101, 121, 110, 10 o 100? Bueno, eso depende de lo que pretendiera el programador. La cuestión es que si dejamos que P1 y P2 se ejecuten en paralelo, no podemos estar seguros de qué respuesta se obtendrá. ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.