تدريب Shadowing: 🚫 Java Deadlock Explained: Why Your Code is Stuck 😱 (Beginners Must Watch!) - تعلم التحدث بالإنجليزية عبر الفيديو
جارٍ إنشاء الدرس...
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We have seen deadlock example.
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We have given the example of the lock.
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But we are going to read deadlock officially.
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I will give you a example of how the code looks.
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We will see deadlock doesn't work.
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We will see how it will resolve.
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First of all, what is formal definition?
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In multi-threading, deadlock is a situation where the threats are always blocked.
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And they depend on the other side.
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For example, A and B, A has a pen and a paper.
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A waits for B, when he gives a paper, then I start to write.
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B waits for A, when he gives a pen, then I start to write.
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Just, nothing is wrong.
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One is waiting for another.
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So, the work will not be wrong and wait for forever.
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So, this is a condition called deadlock.
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Formal, formal.
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Formal, when it comes to match, the deadlock is called.
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Mutual exclusion.
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Sir, our critical section is called, which should be locked.
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First thing is obvious.
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Then there will be a wait.
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Another thing is, Hold and wait.
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A thread holding at least one resource is waiting to acquire.
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Obviously.
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Third thing is no preemption.
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You can't remove pen or pencil.
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You can't remove paper.
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We haven't read this yet.
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It's circular wait.
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This is obvious.
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The obvious thing is, they divide in 4 parts.
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It's false.
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But obviously, if someone's mind is bad, then they can ask.
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Okay, sir.
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So, theory has happened.
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Sir, a real life example.
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I have given you a class pen and a class paper.
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What is written in pen?
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Write with pen and paper.
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It is a method.
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It is called paper.finishedWriting.
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Another class is class paper.
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It is called write with write with paper and pen.
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And then finish writing method.
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I am going to show you the functionality.
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What is written in the upper part?
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I will go in the upper part.
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I will make two threads.
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Task 1.
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The next thread is task 2.
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In the main thread, a pen and a paper and the threads are made.
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Then I will start.
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I am giving a high level overview.
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Thread 1 is using pen and is trying to use paper.
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Thread 2 is using paper and trying to use pen.
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And it's going infinitely.
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I will close it to forcefully.
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The condition is the same.
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Two threads have two people.
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One has pen and trying to use paper.
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The other one has B.
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The other one has paper and trying to use pen.
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The solution is not coming.
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This is deadlock.
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Now, look at the code.
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There are two methods, paper, and two threads.
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Task 1 and Task 2.
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We will create the object in that two objects.
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Pen and paper.
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Similarly with Task 2.
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When we create the object in Task 2, we will create the object in the constructor.
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Obviously, one pen will be and one paper.
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So, two people are.
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Thread 1 and Thread 2.
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There are two things.
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One pen and one paper.
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Thread 1 is written in the first one.
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One person has pen.
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Pen.Write with pen and paper.
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The other person has paper.
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Now we are going to pen and paper class.
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Pen has two methods.
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Write with pen and paper and finish writing.
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Paper has two methods.
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Write with paper and pen and finish writing.
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Pen has been written in thread 1.
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Synchronize is put.
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When a method is declared by synchronized keyword,
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this method will acquire the intrinsic lock of the object the method belongs to.
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Pen will acquire the method.
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Pen will acquire the method.
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And then, paper.finish writing.
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This method will need paper and pen,
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so it comes to paper and pen.
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and he is trying to run pen.finish writing.
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When will it run pen?
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When it has a pen lock.
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What do you mean?
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It depends on the other one.
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What is thread 1?
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It has a pen.
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And trying to use paper.
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Similarly thread 2 is using paper and trying to use pen.
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But nothing is happening.
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Then we close it.
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What is deadlock?
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If it has not been done, then see it again.
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I am saying it again.
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Now I need to resolve this, I need to resolve this, deadlock is not necessary.
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So what can I do?
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There are many strategies.
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What is common approach?
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Ensure that all the threats are consistent order to acquire locks.
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Consistent order means that multiple threats which are required to acquire locks and multiple resources,
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they should always acquire the resources in the same sequence.
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Class pen and paper Here is the lock acquired.
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What is the lock?
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The pen and paper are the same.
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We will do the same work.
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If we change the lock, then the result will be deadlock.
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Now, Task 1 is going to lock pen and paper.
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Task 2 is going to lock pen and pen.
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What do we do?
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We use the synchronized keyword.
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We want to lock and pen.
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We will say Task 2 is going to lock pen and pen.
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Then, paper can lock.
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This is the two things.
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I will put it here.
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It will make sure that thread 2 is going to lock pen.
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When you have pen lock, it's a good thing.
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But pen lock is a thread 1, no matter what you will do.
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And paper lock will come, because thread to run not.
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Because thread to run, you should have pen lock, then paper lock will acquire.
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So, understand how now.
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If we change ordering, consistent ordering,
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lock will acquire, we can resolve the deadlock.
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Okay?
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Now, keep the tension so much.
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Keep the tension so much.
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Sir, we have a small example which we have resolved.
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That's it.
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Keep the tension so much.
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Keep the tension so much.
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Okay, sir.
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لماذا يجب ممارسة التحدث مع هذا الفيديو؟
في الفيديو الذي نتناوله، يتم شرح مفهوم مهم في برمجة الجافا يُعرف بـ "الجمود" أو "deadlock". هذا الموضوع يمثل تحديًا كبيرًا للمبرمجين، لذا فإن التحدث حوله وممارسته يمكن أن يساعدك في تحسين مهاراتك اللغوية. من خلال الاستماع إلى المتحدث واتباع أسلوبه في الشرح، يمكنك تقوية مفرداتك وفهمك للغة التقنية. بالإضافة إلى ذلك، ستتعلم كيفية استخدام اللغة الإنجليزية في سياق عملي ينطبق على عالم البرمجة.
القواعد والتعابير في السياق
يتضمن الحوار في الفيديو بعض التعبيرات والمفردات المفيدة التي يجب التركيز عليها:
- التعريف الرسمي: يقدم المتحدث تعريفًا واضحًا لمفهوم الجمود، مما يساعد على فهم المصطلحات التقنية.
- انتظار الموارن: يُبرز فكرة أن أحد الخيوط ينتظر الآخر، وهو عنصر أساسي في فهم كيفية حدوث الجمود.
- لا يمكن الاستيلاء: يشير إلى أنه لا يمكن إزالة الموارد من الخيوط، مما يسلط الضوء على طبيعة الجمود.
- انتظار دائري: وهو مفهوم يشير إلى كيفية اعتماد الخيوط على بعضها البعض، وهذا يساعد في توضيح الفكرة بشكل أفضل.
عند ممارسة اللغة، حاول استخدام هذه التعابير في جمل خاصة بك. هذا سيساعدك في تحسين النطق باللغة الإنجليزية.
فخاخ النطق الشائعة
هناك بعض العبارات والمفردات التي قد تكون صعبة النطق. على سبيل المثال، كلمة "deadlock" قد تكون معقدة بالنسبة لبعض المتعلمين. جرب تكرارها عدة مرات حتى تشعر بالراحة في نطقها. كذلك، حاول الانتباه إلى اللكنة وكيفية استخدام الأنماط الصوتية في المحادثة.
من خلال ممارسة أسلوب shadow speak أو "التحدث بالتوازي"، يمكنك تحسين مهارات النطق لديك بشكل كبير. استمع بعناية إلى الفيديو وحاول تقليد المتحدث، مما سيساعدك في الوصول إلى مستوى متقدم في تعلم الإنجليزية مع يوتيوب.
استخدم مواقع shadowing المختلفة لتطوير مهاراتك، واستمتع بعملية التعلم!
القواعد في هذا الفيديو
أكثر التراكيب التي يستخدمها المتحدث، مع العبارات نفسها من الفيديو:
| التركيب | في الفيديو |
|---|---|
| المبني للمجهول be + اسم المفعول — التركيز على ما يحدث لا على من يفعله | are always blocked · is called · is written |
| المضارع التام have/has + اسم المفعول — حدث ماضٍ ما زال له أثر الآن | have seen · have given · haven't read |
ما هي تقنية التظليل الصوتي؟
التظليل الصوتي (Shadowing) تقنية تعلم لغة مدعومة علمياً، طُورت أصلاً لتدريب المترجمين الفوريين المحترفين. الطريقة بسيطة لكنها قوية: تستمع لصوت إنجليزي أصلي وتكرره فوراً بصوت عالٍ — كظل يتبع المتحدث بتأخير 1-2 ثانية. تُظهر الأبحاث تحسناً كبيراً في دقة النطق والتنغيم والإيقاع وربط الأصوات والاستماع والطلاقة.