Trabalho 1 – EPOS
Idle-waiting Thread Joining
– Este trabalho tinha como objetivo alterar o modo que era feito o “join” em uma Thread. Sendo que o mesmo inicialmente era feito da seguinte maneira:
[code lang=”c”] while(_state != FINISHING)
yield();
[/code]
O mesmo consiste basicamente, em verificar o estado da thread que se esta dando join e caso o estado nao seja FINISHING dar a vez a outro processo. Esta solucao, acarreta no consumo excessivo de recursos ja que o mesmo sempre retorna para a fila de _ready. E eh executado novamente quando o escalonador escolher esta thread. O trabalho pede que seja modificado de modo que o consumo de recursos nao seja excessivo.
Arquivos Modificados:
– thread.cc
– Thread.h
Solucao:
Foi criada uma variável adicional em threads.h, _waiting_for_me, que é um ponteiro para uma thread. Quando o método “join” é chamado, a thread que está executando é colocada no _waiting_for_me da thread chamada e é suspensa. Se a thread já finalizou ou alguém já chamou “join” nela, nada é feito. No método “exit”, caso _waiting_for_me esteja preenchida, é chamado o método “resume” na thread referenciada.
Pensamos em colocar uma lista de referências para várias threads poderem dar “join” na mesma thread, porém vimos na documentação do POSIX que isso era considerado um erro lógico, e achamos que acarretaria um consumo de recursos adicional desnecessário, pois não seria possível usar o _link já existente na thread, já que ela teria de estar tanto na lista de suspensos quanto na lista _waiting_for_me da outra thread.
Explicacao mais detalhada da implementacao escolhida e outras solucoes pensadas.
В этой статье мы говорим о важности поддержки в процессе выздоровления. Рассматриваются семьи, группы поддержки, специалисты и онлайн-ресурсы, которые могут сыграть решающую роль в избавлении от зависимости.
А есть ли продолжение? – вывод из запоя на дому ростов
В этой статье рассматриваются актуальные вопросы, связанные с развитием медицинской науки и её внедрением в повседневную практику. Особое внимание уделено вопросам профилактики, ранней диагностики и использованию технологий для улучшения здоровья человека.
Углубиться в тему – частный медик 24 ростов на дону
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Took a quick scan first and then went back to read properly because the post deserved it, and a stop at creativechoiceoutlet kept me reading carefully too, the kind of writing that earns a slower second pass rather than getting skimmed and forgotten is something I value highly when I happen to find it.
Felt the writer was being honest with the reader which is rare enough that I want to acknowledge it, and a look at bestdailyoffers continued that honest feel, content built on actual knowledge rather than aggregated summaries is something I value highly and rarely come across in regular searches on the open internet these days.
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Decided this was the kind of site I would defend in a discussion about good blog content, and a stop at linkbloom reinforced that, very few sites earn active defence rather than passive consumption and this one has clearly crossed that threshold for me without needing any explicit pitch from the writers themselves either.
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My friends would appreciate a few of these posts and I will be sending links accordingly, and a look at dailychoicecorner added more pages to my share queue, content that earns shares to specific people in specific contexts is content with social utility and this site is generating those targeted shares from me consistently lately.
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