This question is based on Synchronizing on an Integer value. The solution there seems excellent only there is small problem it does not address the concern how to delete values from ConcurrentHash...

From what I understand, the crystals on PCs are notorious for clock skew. If clocks are always skewing, what is the best way to synchronize clocks between machines, with millisecond accuracy and pr...

The CRUD-based part of our application needs: Offline bidirectional "two-way" syncing Ability to modify data until ready and then "publish". Audit log Event Sourcing (or the "command pattern") ...

In store, there is an event beforeload: beforeload( Ext.data.Store store, Ext.data.Operation operation, Object eOpts ) by listening to this event, i can add my additional param to operation when...

I'm considering moving to Angular2 from my trusted backbone (or should I say, my boss wants to play with a new toy, which is fine by me), I searched a lot online and made some tests but I can't see...

i am trying to concatenate 3 mp4 files into 1. This is the ffmpeg command im making: shell_exec('ffmpeg -f concat -i '.$random.'.txt -c:v libx264 -preset ultrafast -crf 30 -c:a copy '.$uploadfolde...

Here is a piece of text I found at this link. "Avoid lock on static methods The worst solution is to put the "synchronized" keywords on the static methods, which means it will lock on all in...

I'm doing some exercise about convolution over images (info here) using OpenCL. When I use images whose size is not a square (like r x c) CLK_LOCAL_MEM_FENCE makes the program stop with abort trap ...

I have been reading Memory Barriers: A Hardware View For Software Hackers, a very popular article by Paul E. McKenney. One of the things the paper highlights is that, very weakly ordered processor...

I would like to understand how database replication works conceptually. I know that databases have their own log (e.g., the OpsLog in MongoDB), but most information you can find on the web is about...

I'm trying to move some of my old projects from ThreadPool and standalone Thread to TPL Task, because it supports some very handy features, like continuations with Task.ContinueWith (and from C# 5 ...

I'm writing a fast multi-thread program, and I want to avoid syncronization (the function which would need to be syncronized must be called something like 5,000,000 times per second, so even a mute...

I have one Golang struct shared among multiple goroutines. For concurrent access to struct members, there is the mutex sync.RWMutex. For struct member that is accessed by one single goroutine, is t...

I have multiple threads writing data to a common source, and I would like two threads to block each other if and only if they are touching the same piece of data. It would be nice to have a way to...

I have one producer and many consumers. the producer is fast and generating a lot of results tokens with the same value need to be processed sequentially tokens with different values must be proc...

What is the usage of synchronized statements?

Supposedly I have the following class definition, when one thread wants to set a for multiple (potentially) waiting threads: public class A {     private int a;     private CountDownLatch gate;  ...

Can anyone explain what exactly the Android Backup API is used for? I have read Using the Backup API and Data Backup from the Developer Docs, but it is still unclear to me. When is data backed up...

Consider the following class: class Ideone { private Map<String, String> m; public Ideone(){ synchronized(this){ m = new ConcurrentHashMap<>(); } } public synchronized Map<S...

I have a class that is similar to this: public class ExpensiveCalculation { private Executor threadExecutor = ... private Object lock = new Object(); private Object data = null; public Objec...

Java provides a very convenient idiom for synchronizing critical portions of code: synchronized(someObject) { // do something really important all by myself with nobody bothering me } Or publi...

I'm using LinkedBlockingQueue between two different threads. One thread adds data via add, while the other thread receives data via take. My question is, do I need to synchronize access to add and...

I'm not a professional programmer, but I do some small solo projects and I would like some versioning and syncing, but going through the process of remember to commit and checkout (on different com...

I have two threads, one thread should receive and process requests from another. The second is to transfer requests and receive a response synchronously. I tried the following scheme: queue of pair...

Which Java synchronisation object should I use to ensure an arbitrarily large number of tasks are completed? The constraints are that: Each task takes a non-trivial amount of time to complete and...