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1. el ejemplo facil, el contador roto. JRruby 1000.times { Thread.new { i += 1 } } 2. ejemplo en java Falacias: a. si no es thread safe, se rompe siempre. Eso da dos problemas: podemos confiar en cosas en que no deberiamos, o podemos tener exceso de precausion b. si es thread safe, es thread safe http://www.jstorimer.com/pages/ruby-core-classes-arent-thread-safe Moraleja 1: la concurrencia es difícil. 3. Problema: queremos construir un KV concurrente. JRuby, test 1 pasa. Comparar con elixir; notar que no hay join. Notar patrones. Ojo para los que saben ruby, estoy usando jruby 4. Problema del contador roto. Ojo, en elixir está roto también (pero es más facil de arreglar) Moraleja 2: actores no evita las race conditions ni problemas de concurrencia per se. La delagación cobra nuevo valor. 5. Mostrar nuevamente la versión original rota, esta vez en ruby puro. Falacia d. con green thread no hay problemas de concurrencia Moraleja: el problema es la concurrencia, no el paralelismo.
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