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.
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Worth saying that the quiet confidence of the writing is what landed first, and a look at epicinlets continued that quiet quality, confident writing without the loud display of confidence is a rare combination and this site has clearly developed both the knowledge and the editorial restraint to land that combination consistently.
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Stands apart from similar pages by actually being useful, that is high praise these days, and a look at brightnorthboutique kept that standard going, you can tell when a site is built around the reader versus around metrics and this one clearly belongs to the first category for sure based on what I read.
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Reading this in a quiet hour and finding it suited the quiet, and a stop at irisarbors extended the quiet reading mood, content that matches its own optimal reading conditions rather than fighting them is content that has been thoughtfully calibrated and this site reads as having a particular reading mood in mind throughout.
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Now appreciating that the post did not require external context to follow, and a look at isleparishs maintained the same self contained quality, content that respects new visitors by being readable without prerequisites is content with broader accessibility and this site has clearly invested in keeping each piece reader friendly for fresh arrivals.
Reading this with a fresh mind in the morning brought out details I might have missed in the afternoon, and a stop at lacecabins earned the same fresh attention, content that rewards being read at full attention rather than at energy lows is content with real density and this site has that density consistently.
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Solid value packed into a relatively short post, that takes skill, and a look at portmills continues the dense useful content across more pages, this site clearly understands that respecting reader time is itself a form of generosity which is something most blog operations seem to have forgotten lately across the wider open web.
Solid little post, the kind that does not need to be flashy because the substance is doing the work, and a look at robinshuteracing kept that quiet confidence going across the site, this is what writing looks like when the writer trusts the content to land on its own without theatrics or unnecessary attention seeking behaviour.
During a quiet evening reading session this provided just the right depth without being heavy, and a stop at ct2020highschoolgrads maintained the same evening appropriate weight, content with depth that does not exhaust the reader is content with editorial calibration and this site has clearly figured out how to be substantial without being demanding all the time.
After reading several posts back to back the consistent voice across them is impressive, and a stop at pacecabin continued that voice consistency, sites that maintain a single coherent voice across many pieces by potentially many writers represent serious editorial discipline and this one has clearly developed the institutional consistency needed for that.
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A genuine compliment to the writer for keeping the post focused on what mattered, and a look at pactcliff continued that disciplined focus, focus is a editorial choice that compounds across many small decisions and this site has clearly made those small decisions consistently across what I have read so far this week here.
Now feeling mildly impressed in a way I do not quite remember feeling about a blog in a while, and a stop at thedemocracyroadshow extended that mild impression, content that produces specific positive emotional responses rather than just neutral information transfer is content with extra dimensions and this site has those extra dimensions clearly.
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If a friend asked me where to read carefully on the topic I would send them here without hesitation, and a look at mintdawns confirmed the recommendation strength, the directness of my recommendation reflects how confident I am in the quality and this site has earned undiluted recommendations from me across multiple recent conversations actually.
Now recognising the editorial wisdom of letting some questions remain open at the end, and a look at pactcliff continued that intellectual honesty, content that does not force closure on contested questions is content that respects the limits of knowledge and this site has clearly developed the maturity to know when to leave space.
A piece that suggested careful editing without showing the marks of the editing, and a look at lobbydawn continued that invisible polish, the best editing disappears into the prose and this site reads as having been edited with skill that does not announce itself which is the highest compliment I can offer any blog content.
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Worth saying that the quiet confidence of the writing is what landed first, and a look at ethicaleverydaystyle continued that quiet quality, confident writing without the loud display of confidence is a rare combination and this site has clearly developed both the knowledge and the editorial restraint to land that combination consistently.
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Thanks for the clean writing, no broken sentences and no awkward translations like some other sites have, and a quick stop at globebeat kept that polish going nicely, it really does make a difference when a reader can move through a page without tripping on every line or going back to reread.
Felt this in a way I cannot quite explain, the topic just hit different here, and a stop at edenfairs continued in that vein, sometimes you find a site whose perspective lines up with how you have been thinking and reading their work feels like a small relief which I appreciated more than I expected.
During the time spent here I noticed the absence of the usual distractions, and a stop at charitiespt extended that distraction free experience, content that does not fight my attention with pop ups and modals and aggressive prompts is content that respects me and this site has clearly chosen the respectful approach throughout.
Generally I find the content on similar topics frustrating in specific ways and this post avoided all of them, and a look at globebeat continued that frustration free experience, content that sidesteps the standard failure modes of its genre is content with editorial awareness and this site has clearly studied what fails elsewhere consistently.
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If I had encountered this site five years ago I would have been telling everyone about it, and a look at larkcliffs extended that retrospective enthusiasm, the version of me who used to recommend favourite blogs frequently would have made sure friends knew about this one and that earlier enthusiasm is partially returning to me here.
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