September 2024
Intermediate to advanced
552 pages
16h 34m
Spanish
Content preview from Aprender Java, 6ª Edición
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Capítulo 9. Hilos
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Damos por sentado en que los sistemas informáticos modernos pueden gestionar muchas aplicaciones y tareas del sistema operativo (SO) que se ejecutan simultáneamente y hacer que parezca que todo el software se ejecuta simultáneamente. La mayoría de los sistemas actuales tienen varios procesadores o varios núcleos, o ambos, y pueden alcanzar un grado impresionante de concurrencia. El SO sigue haciendo malabarismos con las aplicaciones a un nivel superior, pero cambia su atención de una a otra tan rápidamente que también parece que se ejecutan a la vez.
Nota
En programación, operación concurrente denota múltiples tareas, normalmente no relacionadas, que se ejecutan al mismo tiempo. Piensa en un cocinero de comida rápida preparando varios pedidos en una parrilla. La operación paralela normalmente implica dividir una tarea grande en subtareas relacionadas que pueden ejecutarse unas junto a otras para producir el resultado final más rápidamente. Nuestro cocinero podría preparar una hamburguesa doble con queso y bacon "en paralelo", echando a la parrilla dos hamburguesas y un poco de bacon al mismo tiempo. En cualquier caso, los programadores hablan de forma más general de que estas tareas y subtareas se producen simultáneamente. Eso no quiere decir que todo empiece y termine en el mismo instante exacto, pero sí que los tiempos de ejecución de esas tareas ...
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