I’ve read from this article that: …Synchronized blocks also guarantee that all variables accessed inside the synchronized block will be read in from main memory, and when the thread exits the synchronized block, all updated variables will be flushed back to main memory again, regardless of whether…
Tag: synchronization
Is it possible to implement a semaphore that avails permits in timed intervals?
I’m trying to implement a program that allows a maximum of 5 customers to enter a store at once. They move around (one block at a time, max 1 customer per block) and then exit. The problem I’m facing …
Synchronization with static block
I have a question: can we use the static keyword with a synchronized method? As we all know that static is related to class and synchronization is used to block an object, using synchronized with static doesn’t make any sense to me. So why and in which situation would I use synchronization with the stat…
Java synchronization between different JVMs
The project I am working on would trigger various asynchronous jobs to do some work. As I look into it more these asynchronous jobs are actually being run as separate JVMs (separate java processes). Does it mean I would not be able to use any of the following if I need to synchronize between these processes: …
Using a synchronizedSet to synchronize access between two threads
I’m not able to synchronize two threads using a set: and passing it to two threads. One accessing: and another updating: What happens is that [1], [2], [3] happens in sequence. During [1], it is correct that the set doesn’t have yet the item I’m looking for. But then [2] updates it by adding…
Thread Safe Singletons in Java
The wikipedia article on Singletons mentions a few thread safe ways to implement the structure in Java. For my questions, let’s consider Singletons that have lengthy initialization procedures and are acccessed by many threads at once. Firstly, is this unmentioned method thread-safe, and if so, what does…
singleton pattern in java. lazy initialization
1.is there a flaw with the above implementation of the getInstance method? 2.What is the difference between the two implementations.? I have seen a lot of answers on the singleton pattern in stackoverflow but the question I have posted is to know mainly difference of ‘synchronize’ at method and bl…