Trabalho 2 – EPOS
Implementação de Idle-waiting
A implementação do exercicio 2, consiste em alteração da classe Syncronizer, onde na versão inicial a mesma utiliza yield gerando uma carga desnecessária para o processador. A alteração deve ser semelhante a realizada no exercicio um, fazendo com que não seja gasto recursos sem necessidade.
Durante as discussões sobre a implementação imaginamos uma nova váriavel dentro de cada Thread para monitorar se a mesma está em uma estrutura como Semaphoro, Mutex ou váriavel condicional. Assim sendo possivel a verificação se está ou não, permitindo que nós façamos as devidas verificações para que o método resume e suspend não possam ser chamados quando a mesma estivesse esperando. Após algum tempo discutindo e analise dos códigos foi imaginada uma abordagem que em vez de criar uma váriavel nova para cada Thread seria necessário simplesmente a criação de um novo estado, denominado por nós de WAITING. Junto a isso foi criada uma fila para cada “Synchronizer”, que possui os processos que estão esperando para serem acordados. Os métodos que acordam os outros processos (wakeup e wakeup_all) foram implementados de forma não bloqueante, ou seja, as threads acordadas são apenas colocadas na fila “_ready”, sem troca imediata de contexto.
Outras alterações também foram realizadas nos arquivos synchronizer.h, thread.cc, condition.h e semaphore.h, para que os mesmos funcionem corretamente com o novo estado WAITING. Por exemplo, no arquivo Thread.cc as implementações de Join, Resume e exit foram alteradas para a utilização deste novo estado, neste arquivo também foram criados novos métodos denominados sleep e wakeup. Que basicamente tratam a parte de colocar para dormir e botar neste novo estado e também na fila do “Synchronizer”. As devidas alterações foram realizadas nos demais arquivos, para que os mesmos funcionem com o novo estado WAITING.
Também implementamos o busy waiting no “Synchronizer”, para o usuário poder escolher entre busy e idle waiting alterando uma variável booleana.
Arquivos Modificados:
synchronizer
condition.h
semaphore
thread
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I’ve been betting with Tenobet since roughly five months now, mainly slots during the week and the odd Premier League action come Saturday. Not gonna lie, I got there via a lad from my local wouldn’t shut up about it, so I went in fairly sceptical.\n\nGame selection is decent — I reckon about 3,000 titles if you count everything. The usual suspects are there: Pragmatic, Play’n GO, Microgaming, Betsoft. I live on Gates of Olympus and Sweet Bonanza, though the Megaways stuff eats my balance faster. Live side is Evolution, so no complaints there — real croupiers, roulette round the clock, plus Crazy Time and Lightning Roulette.\n\nThe sign-up offer with Tenobet maxes at ?125 matched plus some bonus spins, wagering sits at 30x — that’s nothing scandalous but read it properly. No no deposit freebie unless I missed it, min deposit was a tenner to kick it off. To check what’s live right now they’re listed on tenobet app rather than trusting my memory. My gripe: the spins expire in 7 days and I lost half of mine to being busy.\n\nPayouts are the bit I actually care about. E-wallet took about a day for me, debit card was three working days, which is normal for UK banking. They do Bitcoin and the usual e-wallets, though I haven’t bothered with Bitcoin. Verification was painless enough — passport and a utility bill, done in a day.\n\nNo app on the Play Store, but a browser version and loads quick enough on my phone — I use it more than desktop now. Live chat on Tenobet took under ten minutes both times, actual person, decent English. It’s UKGC licensed, which is the first thing I check these days.
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Been playing at Tenobet since maybe four months on and off, usually the slots during the week and a bit of accumulator betting on Saturdays. Not gonna lie, I first joined after a lad from my local mentioned it, so my expectations weren’t massive.\n\nThe slots side is decent — I reckon about 2,000 slots last time I scrolled. The usual suspects are there: Pragmatic Play, Play’n GO, Microgaming, Betsoft. I live on Gates of Olympus and Sweet Bonanza, although the Megaways stuff is where I lose the most. The live dealer rooms are Evolution, which is basically the gold standard — actual dealers, blackjack tables at all hours, and Crazy Time if you fancy something daft.\n\nThe sign-up offer on Tenobet goes to ?125 with a batch of free spins, the playthrough is 35x which is nothing scandalous but read it properly. There’s no no deposit freebie as far as I could see, min deposit was ?10 or ?20 to trigger it. If you want the current terms they’re listed on [url=https://clock-desktop.com/en-gb]tenobet reviews[/url] before you deposit. The one thing that annoyed me: the spins expire in 7 days and I lost half of mine to being busy.\n\nWithdrawals are the bit I actually care about. Skrill came back in roughly 18 hours for me, Visa took closer to three days, which is just how cards are. You also get Neteller, Visa and some crypto options, though I haven’t bothered with Bitcoin. Verification was painless enough — driving licence and a bank statement, done in a day.\n\nThere’s no standalone app that I found, but a browser version and it’s fine — I’ve placed bets on it on the train plenty. Support on Tenobet took about five minutes when I asked about a stuck bonus, human, not a bot loop. It’s UKGC licensed, which is the first thing I check these days.