Relevant code: Why can’t the server and client be started together in the @Test? I think it gets stuck in the infinite while loop but at the same time, shouldn’t there be context switching with the new threads started after accepting the connection? I expected at least the name of the 2 new threads to be printed but it doesn’t
Tag: multithreading
how to add synchronization in following lambda exp?
Can synchronized blocks be used for some of the code blocks written in lambda expression . With respect to the following code snippet : Answer It is possible to use synchronized blocks inside a Java Lambda Expression and inside anonymous classes. Note: You have forgotten to add code snippet as no code snippet is visible in your code , So
Java Thread is blocked in join()
I have the following simple code in which I put and take from a Queue represented as an ArrayList. I don’t understand why my thread is blocked in join() method. From main I call as follow: Answer Without running it… The close() method holds lock at the time it calls thread.join() and waits on thread (forever) thread is waiting to
Thread join(1) usage in mutlithread wait-notify example in Java
I have example with wait-notify application which is invoked from main: } and invoker } As I expected “exception” message should be printed as I join(1) to threads and wait them to die only 1 mills, but they are sleeping more than that. What am I missing? Answer join(1) has 3 ways ‘out’: The thread you called join on ends,
Visibility of mutable object under different locks in Java
mFeaute is a mutable object. I want to know if the change of mFeature in setFeature(Feature feature) is visible to mFeature in useFeature(…) with a different explicit form of synchronized. Thanks. Answer The above code is suffering from a data race and hence is broken. You do not have a happens before edge between the write and the read of
Why does Thread.activeCount() count more threads than my code creates?
I’m a beginner in Java development and i trying to write a multi threading process with using CountDownLatch in below code. But ExecutorService not working as it should. ExecutorService thread number not working as it defined in code. Console log; I defined thread number as 50, but when it works Thread.activeCount() function returns 81. Why ? Answer You are using
What does “Aren’t allocating the things put into queues” mean?
I’m reading this: https://concurrency.markmail.org/search/?q=ArrayBlockingQueue+LinkedBlockingQueue#query:ArrayBlockingQueue%20LinkedBlockingQueue%20from%3A%22Doug%20Lea%22+page:1+mid:sgx3amdfga7esqul+state:results In which Doug Lea says: Usually, when you are putting something into a queue, you will have just allocated that new something. And similarly, when you take something out you usually use it and then let it become garbage. In which case the extra allocation for a queue node is not going to make much difference
Correct way to decrement an AtomicLong by a certain delta
Given an AtomicLong object, what is the right way to decrement the value by a delta? Option 1 Option 2 While both give the desired result, I want to understand under what circumstance will they not represent the desired behavior i.e to decrement a long value atomically? (One drawback of the second approach for example could be the negative sign
service.shutdownNow() not killing the thread
In my application im spawning a single thread executor and in the thread I’m doing logic of loading ML models/predictions. If any of the logic exceeds the time-limit(4 minutes), I’m shutting down the thread. But when the application is up, when time out happens, I’m able to see logs of threads getting shut down. But the process(Prediciton logic) continues to
How does a thread work with Handler in Android?
In the code section given below, I have run a thread on a button click. At first, the thread will set text to the textView, then it will sleep for 6 seconds. But, in reality on the button click, at first, the thread is sleeping for 6 seconds and then it is setting text to the textView. Now, why is