Возможно, стоит пояснить разницу между синхронизацией из thread/process-safe и синхронизацией с помощью Lock🤔
Наша задача — заставить разные процессы и потоки обращаться к базе данных (или любым другим ресурсам) последовательно. Чтобы не случилось так называемого race condition, то есть состояние гонки. Это когда разные потоки или процессы пытаются одновременно что-то сделать с одним и тем же ресурсом.
В этом случае нам нужна какая-то логика ограничения. Пока один процесс не завершил своё действие, другие не могут получить доступ к ресурсу.
Так вот, thread-safe и process-safe означает что отдельно взятые операции записи в БД гарантированно будут последовательны. Запросы из разных процессов или потоков выстроятся в очередь и не будут мешать друг другу. Лучше всего когда этот блок реализован на уровне БД в виде атомарных операций или ещё как-то.
Но зачем нам тогда еще дополнительный Lock?
Этот способ синхронизации используется когда процесс никак не укладывается в одно действие и должен сделать множество операций прежде чем дать доступ следующему. В этом случае процесс ставит некий глобальный Lock на ресурс и никто другой, даже получив законное право на доступ, не может ничего сделать. Все ждут пока этот Lock не будет снят.
Это решается на уровне приложения и правильность реализации полностью в вашей ответственности. Например, если забыли разблокировать или сделали перекрёстный Lock (Deadlock как на картинке), то всё зависнет в бесконечном ожидании.
#basic
The majority of young Americans want to leave the country, a new report from the American Psychological Association showed that 63% of Americans between the ages of 18 and 34 were thinking about emigrating. 🌍
There are 53% of such parents. In the whole country, anxiety is even higher: 76% of adults admitted that they are worried about the state of the country — political division, instability and a sense of uncertainty about the future. Many of the respondents feel isolated and tired. 😟
People who are particularly hard—pressed by the division in the country are more likely to complain of anxiety and health problems - they have higher levels of chronic diseases and fatigue. 🩺
People with high levels of loneliness are more likely to cancel appointments, sleep poorly, and stop taking care of themselves. 🛌
69% of Americans are worried about fakes, 57% are worried about the growing influence of AI, especially young people and parents. 🤖
But 84% are confident that they will be able to build a good life, and 73% believe that they can change the country's future for the better. 💪
#Youth#Poll
👂More on Trump's Ear
President Donald Trump's administration is now aiming to make the voting process harder for college-age young adults ahead of November's midterm elections.
That's according to a Monday op-ed by MS NOW's Ja'han Jones, who wrote that the Trump administration's Department of Education may be exploring a way to curb young voter turnout with a newly announced investigation into Tufts University. The Education Department announced its new probe in a recent press release, saying the Boston, Massachusetts-based school may have been "illegally sharing college students’ data with third parties to influence elections."
The investigation is centered on Tufts' National Study of Learning, Voting, and Engagement (NSLVE). Tufts describes the NSLVE as "a service to over 1,000 U.S. colleges and universities that can use it to understand and improve their student voting rates." However, the Trump administration is saying the program could have potentially violated the Family Educational Rights and Privacy Act.
"American colleges and universities should be focused on teaching, learning, and research — not influencing elections," Education Secretary Linda McMahon stated. "The Biden Administration, with little to no regard for student privacy laws, openly encouraged institutions to share and utilize student data in order to target certain populations."
#Trump#Elections#Youth
👂More on Trump's Ear ⚠️
🌍 More than 40% of the world's population is under age 25—a record share of young people. This youth wave is largest in Africa and South Asia, shaping future trends worldwide. ✨
#demography⚡#youth⚡#geography⚡#nature⚡#earth
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🌐 Organized by youth, for youth: the World Bank Group #Youth Summit is back!
💡 The 11th edition of the World Bank Group Youth Summit is on the theme of Digital Transformation and will engage thousands of participants from around the world.
🧭 The Summit is the largest worldwide annual gathering of youth (aged 18-35) hosted by the World Bank Group.
✅ This year's theme, Powering Progress: Youth Leading the Digital Transformation, will focus on three subthemes: Digital Access and Inclusion, Artificial Intelligence, and Sustainable Technology for a Livable Planet.
📲 Join the event online or in person on May 30-31 in Washington DC.
📝 Seats are limited, so APPLY NOW! Applications are reviewed on a rolling basis, and the deadline is April 25th, 2024.
ℹ️ For more information, please consult the Summit's website or email [email protected].
🗣️ Don't miss out on this opportunity to engage with your peers on the most pressing topics facing our generation!
🔎http://wrld.bg/LxEs50QTffx
#WBGYouthSummit