Category Archives: Без рубрики

🔁 volatile — Visibility in Concurrency Purpose: Ensures that changes to a variable are always visible to all threads.

When you declare a static synchronized method in Java, synchronization happens on the Class object, not on an instance of the class.

In Java, there’s no direct API like Thread.holdsMonitor(Object obj) — but there are a few ways to indirectly check or debug whether a thread holds a monitor on a specific object.

A livelock is similar to a deadlock, but with a twist: Threads keep changing their state in response to each other, but make no real progress. They’re not blocked (like in a deadlock), but they’re too polite — constantly reacting … Continue reading →

A deadlock is a situation in multithreaded programming where two or more threads are blocked forever, each waiting for the other to release a lock. It’s like two people trying to pass each other in a narrow hallway: Person A … Continue reading →

Thread.join() in Java is a method that allows one thread to wait for the completion of another thread before continuing its execution. It’s a synchronization mechanism that ensures a thread finishes before the calling thread proceeds.

Let’s dive into this with clarity and depth: ❓ Why are wait(), notify(), and notifyAll() allowed only inside a synchronized block or method?

🔔 notify() vs notifyAll() — Core Idea notify() Wakes up one random thread that’s waiting on the same object’s monitor (lock). It’s not guaranteed which thread will be woken if multiple are waiting. Only one continues; the others remain waiting. … Continue reading →

🔁 wait(), notify(), notifyAll() — Overview These methods are used for thread communication: they allow threads to coordinate and cooperate by pausing and resuming execution based on certain conditions. They are methods of java.lang.Object, not Thread — because every object … Continue reading →

A private mutex (or private lock object) is often used to gain fine-grained control over synchronization without exposing the locking mechanism to the outside world. Here are the key reasons you might want to use a private mutex instead of … Continue reading →