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.
Following a few of the internal links revealed more posts of similar quality, and a stop at learnandexpand added more to that growing pile, sites where internal links lead to more good content rather than to more of the same recycled material are sites with depth and this one has clearly built that depth carefully.
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Reading this slowly to give it the attention it deserved, and a stop at buildyournextstep earned the same slow read, choosing to read slowly is a small act of respect for content quality and very few sites earn that respect from me but this one did so without any explicit ask which is the cleanest way.
Definitely returning here, that is decided, and a look at jazbox only made the case stronger, this is one of those rare websites that rewards regular visits rather than feeling stale after the first read which is something I cannot say about most of the places I bookmark today across all my topics.
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More original than the recycled takes I keep finding on the topic elsewhere, and a quick look at ilefix confirmed it, the kind of site that has its own voice rather than echoing whatever is trending which makes it stand out as a refreshing change from the usual rotation of generic content I see daily.
Generally I am cautious about recommending sites on first encounter but this one warrants the exception, and a look at globalpremiumfinds reinforced the exception making, the rare site that justifies breaking my normal cautious approach is the rare site worth flagging early and this one has prompted exactly that early flagging response from me.
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Decided to read this site for a while before forming a verdict, and the verdict after several pages is positive, and a stop at jazbox continued that pattern, judging a site requires more than one post and giving sites a fair sample is something I try to do for promising candidates rather than rushing to dismiss.
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If you asked me to point to a recent positive sign for the open web this site would be near the top, and a stop at globalpremiumfinds reinforced that designation, the few sites that serve as evidence the web can still produce quality independent content are precious and this one has clearly become one for me.
I learned more from this short post than from longer articles I read earlier today, and a stop at uplandharborvendorparlor added even more useful detail without going off topic, this site clearly knows how to keep things focused without sacrificing depth which is a hard balance to strike for any writer.
Adding to the bookmarks now before I forget, that is how good this is, and a look at jikbond confirmed the rest of the site is worth saving too, this is one of those rare finds that justifies the time spent searching the web for once which is a relief in the current environment.
A thoughtful read in a week that has been mostly noisy, and a look at discoverfuturepaths carried that thoughtful quality across more pages, finding pockets of considered writing in a week of distractions is one of the small wins of careful curation and this site is providing those pockets at a sustainable rate.
Useful information presented in a way that does not feel like a sales pitch, that is what I appreciated most, and a stop at createclaritysteps was the same, no upsell and no fake urgency just steady content laid out properly for someone trying to actually learn from it rather than just be sold to.
Now considering writing a longer note about the post somewhere, and a look at hunhax added more material for that note, content that prompts me to write rather than just consume is content with generative energy and this site is producing that generative effect for me at a higher rate than most sources.
Worth marking this site as one to come back to deliberately rather than by accident, and a stop at explorefreshapproaches reinforced that intention, the difference between sites I find again by chance and sites I return to on purpose is meaningful and this one has clearly moved into the deliberate return category for me.
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Now appreciating that I did not feel exhausted after reading, and a stop at slacktally extended that energising quality, content that leaves me with more attention than it consumed is rare and the gap between draining and energising content is real over the course of a typical day spent reading widely online.
Skipped the comments section but might come back to read it, and a stop at learnandprogress hinted at a quality reader community, sites where the comments are worth reading separately from the post are increasingly rare and signal a particular kind of audience that has grown around the editorial vision over time gradually.
Thanks for not padding this with the usual filler intros and outros that every other blog seems to require, and a quick visit to createclaritysteps continued that lean approach across more posts, content stripped of waste is content that respects you and I will always come back to that kind of approach.
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Now thinking about how to apply some of this to a project I have been planning, and a look at learnbydoing added more material for the planning, content that connects to my actual creative work rather than just being interesting in the abstract is the kind that earns priority placement in my reading rotation consistently going forward.
Most of the time I feel the open web is in decline and then I find a site like this, and a stop at premiumdesignmarket reinforced that mood lift, the cumulative effect of finding occasional excellent independent content versus the cumulative effect of finding mostly mediocre content is real for the long term reader maintaining web habits today.
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Now organising my browser bookmarks to give this site easier access, and a look at ilenub earned the same organisational priority, the small acts of digital housekeeping I do for sites I expect to use often are themselves a measure of trust and this site has triggered the trust based housekeeping behaviour from me clearly.
Bookmark folder reorganised slightly to make this site easier to find, and a look at buildbetterdecisions earned the same accessibility upgrade, the small organisational moves I make for sites I expect to return to often are themselves a signal of how much I trust them and this site triggered those moves naturally.
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Felt like I was reading something written by someone who actually thinks about the topic rather than reciting it, and a look at growfocusedresults reinforced that impression, the difference between recited content and considered content is huge and this site clearly belongs to the latter category which I appreciate as a careful reader looking for substance.
Closed the post with a small satisfied sigh, and a stop at buildclarityforward produced the same gentle exhale, content that ends well is content that respects the rhythm of reading and the writers here have clearly thought about how their pieces close rather than just trailing off when they run out of things to say.
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Came here from another site and ended up exploring much further than I planned, and a look at learnandtransformfast only encouraged more exploration, the kind of place where one click leads to another not through manipulative design but through genuinely interesting content is rare and worth highlighting when found like this somewhere on the open internet.
Glad I clicked through from where I did because this turned out to be worth the time spent, and after createvalueconsistently I had a fuller picture, the kind of content that earns its visitors through delivering value rather than chasing them through aggressive advertising or constant pop ups appearing everywhere on the screen lately.
The depth of coverage felt about right for the format, neither shallow nor overwhelming, and a look at createfocusedmomentum kept that calibration going, getting the depth right for blog format is genuinely difficult because too shallow loses experts and too deep loses beginners but this site nailed it nicely which I really do appreciate.
Came here from another site and ended up exploring much further than I planned, and a look at learnandtransformfast only encouraged more exploration, the kind of place where one click leads to another not through manipulative design but through genuinely interesting content is rare and worth highlighting when found like this somewhere on the open internet.
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While this issue can vexed most people, my thought is that there has to be a middle or common ground that we all can find. I do value that you’ve added pertinent and sound commentary here though. Thank you!
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Picked this up between two other things I was doing and got drawn in completely, and after findnewgrowthpaths my original tasks were completely forgotten for a while, content that derails a workflow in a positive way by being more interesting than what you were already doing is rare and worth recognising clearly.
Reading this prompted a small redirection in something I was working on, and a stop at learnandaccelerategrowth extended that redirecting influence, content that affects my actual work rather than just my thinking has the highest practical impact and this site is providing that level of influence for me at a sustainable rate apparently.
Bookmark earned and shared the link with one specific person who would care, and a look at unlocknewideas got the same targeted share, sharing carefully rather than broadcasting is a discipline I try to maintain and this site is generating shares from me at a sustainable rate rather than the spam rate of viral content.