Synchronization refers to using controls to maintain a coherent representation, either a group of processes running the same program (process synchronization), or representations of data (data synchronization).

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Passive FTP port assignment synchronization

I've created the following class to manage the assignment of port numbers to passive FTP server sockets. Notice that Semaphore here is to make the thread wait in ...
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32 views

Synchronization of new data with previous data

I am working with synchronization for the first time. I wrote some code that I have to implement in my current work. I wanted to know if I am doing it right or am I making a mistake. Whenever a new ...
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1answer
26 views

callback of setTimeout function when performing synchronous actions

Inside a function I'm calling playgame service, once I've obtained the needed data (gameBeingPlayed) I need to show a 3..2..1 counter and then start a game ...
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70 views

File read/write methods

I'm using some simple files for caching and some basic user data. I was first just using file_put_contens and file_get_contents, ...
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200 views

Implementing an asynchronous mutex in C#

I wrote a simple synchronization primitive that I can use with async operations on an external REST service so that I don't call it twice from different threads and have one call fail due to not ...
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76 views

Dining philosophers using channels

I have the following code to solve dinning philosophers problem using Go channels and am looking for review comments: ...
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1answer
52 views

Synchronization algorithm for deterministic context switching between threads

Curious how sqlite3 would handle different race conditions in a multithreaded environment, I created a simple module called deterministic for serializing the ...
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1answer
77 views

Multithreading, shared queue as synchronization point

I have two threads, one produces images and one processes them. For the synchronization, I created a class where you can set and get images, and it always waits until an image is available or a worker ...
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129 views

Synchronize access to instance method using static serial queue

In my current project I have a number of data services classes, each one dedicated to a specific source of data so that it's responsible of downloading data from its api, checking for local database ...
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1answer
494 views

Boost condition variable wrapper

I would like to create a wrapper for a Boost conditional variable: ...
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1answer
150 views

ConcurrentHashMap Implementation

I have written a simplified version of my own MyConcurrentHashMap. I tried to make use of a Lock[] array for ...
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1answer
287 views

Synchronizing two SQL Server database tables with the most recent changes to both tables

I'm very new to SQL, but I'm coding a C# program that interacts with a database. There's a master database on my computer, and there's a client database on my tablet. When I re-connect my tablet to ...
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1answer
134 views

Simple read/write lock without using a critical section

I have implemented a simple read/write lock without using a critical section. I have tested my code by running 50 threads reading and writing same data. .h file ...
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57 views

Porting Java semaphore to MacOSX

I wanted to write some more JNI code and decided to (re)implement a semaphore for MacOSX. In order to assert somehow correctness of my implementation I hereby supply a (multi)consumer/(multi)producer ...
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2answers
510 views

Synchronization in an event manager

I'm working on an event manager, and I am wanting it to be a tool developers use. It is lightweight and it uses annotations to register events. I've tried to set up ...
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1answer
152 views

Thread lock algorithm [closed]

I am trying to make a thread lock for a method so that only one thread can run it at a time. Although this is a well known issue and in C# there is the lock keyword to do it. I was trying to do it on ...
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2answers
81 views

Removing synchronization from an agent for a trading system

Is there any way to easily remove synchronization from this code, when there is a validation step before acquiring a lock? I tried an ...
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1answer
184 views

Blocking builder with singleton

I am trying to implement a singleton builder that would be shared across multiple builder threads for Coordinate objects. Here is the simplified target class ...
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1answer
358 views

C++11 class similar to .Net's ManualResetEvent, but without the ability to “reset”

The goal is to block all threads that call WaitOne(). When Set() is called, those threads continue. Any calls to ...
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2answers
294 views

Script to enter text in a box

Here's a little script that enters text into a document when activated. ...
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1answer
54 views

Synchronization Event with awaitAny

In Java, there is no way I know of to wait for multiple events at the same time (see Stack Overflow). Since I would like to use that feature (similar to ...
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1answer
351 views

Thread synchronization and happens-before relation in simple examples

I wrote those examples to show different approaches to sharing results between threads. The whole code is on GitHub. All examples should return "Hello world". Are these OK from the perspective of ...
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170 views

Reader/writer spinlock [closed]

I wrote some code for a reader/writer spinlock that gives some preference to writers. Is the code correct? The code uses readerCount for the actual locking and just ...
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2answers
875 views

Synchronous and asynchronous methods in a client library

I am working on a library in which I need to make synchronous and asynchronous method in my client library. My library does this: The customer will use our library and they will call it by passing ...
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1answer
4k views

Updating the UI with a timer - code intended to help teach

I thought it would be helpful to put together an example of what I'm talking about in the second part of my answer to this stackoverflow question. The idea is that there's some data that is updated ...
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2answers
2k views

Singleton necessary in DAO

I am using a singleton in my DAO. Would I be better with static methods? Also, should I be worried about synchronization of the singleton and my data statures? ...
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2answers
2k views

Accessing a String value from multiple threads without synchronization

I'm looking for some input here. I have a class that contains a value which is updated every few seconds by a method within that class. Right now, access to this value across multiple threads is ...
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1answer
1k views

Portable C++ boost::interprocess::mutex

I was looking for long time around to have a portable robust solution for multiprocessing synchronization. Who touche this things know that good solution are boost::iterprocess named sync objects. ...
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2answers
3k views

Using synchronized blocks and volatile variables to ask a Java thread to terminate gracefully

Edit: Just to clarify, this isn't my original code, I've simplified it to make it smaller/easier to understand what I'm trying to do. It's my first time working with threads in Java, and I was ...
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1answer
200 views

Social Share count

I am creating a social sharing counter plugin for my WordPress blog. I want to fetch the counts of number of likes, shares, Facebook comments (I am using Facebook comment box), twitter tweet counts ...
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1answer
134 views

Should I worry about spurious wakeups in Java's BlockingQueue.take()?

I wrote this code where I trap InterruptedException's in a blocking queue and try again to consume from the same queue thinking of Spurious wakeups. I don't know if ...
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2answers
514 views

Reusing objects using a Generic Object Pool

After reading a lot of documents, I wrote this object pooling code. Can anyone help me to improve this code.? I am lagging in validating the object, confirming whether I can reuse it or not? If ...
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2answers
17k views

Simple thread pool in C++

I wrote a simple thread pool, which works pretty well. I would like to see your review of it. One important feature that I needed in the pool is the ability to wait until all the tasks that I sent to ...
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2answers
377 views

Optimize a synchronization with remote web service

I am writing a method to synchronize the local Core Data entities with a remote web service (in this case Parse.com). To update changed or created objects, I fetch all where the "updatedAt" date ...
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2answers
1k views

Windows Phone 8 web service app classes

I have a classes for working with a web service (Windows Phone 8 app). My main question is about the thread-safety of the solutions. I think there will be problems with a static class ...
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1answer
231 views

Importing Markdown Files - Code Efficiency?

I'm building a rails app that, among other things, imports text markdown files as blog posts. The idea is that the truth is in the markdown files, so any time those are edited, created, or deleted, ...
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338 views

Simple multithreading and synchronization problems in MFC

I use a worker thread for some data processing in my MFC project. In the thread-controlling function, it needs to use some parameters (declared as member variables) to the data-processing. I use a ...
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2k views

Python files sync

I'm trying to do a one-way directory sync. Given a list of existing files in a dir, I'd like to make the files in the dir equal a new list of files. There will be subdirs under the dir. Because ...
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2k views

Implementing semaphore - is this right? [closed]

I am learning to use semaphores and below is a small scenario which I've tried to implement. Its behaving weird in a way. After sem_wait() gets unblocked first time, its not getting blocked again and ...
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4answers
695 views

Multi-threaded utility that logs some audit trails

I'm trying to write a multi-threaded utility that logs some audit trails to the DB every 30 minutes, or whenever my storage data structure (a list in this case) exceeds a certain limit. The code ...
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2answers
188 views

Is this a scenario to use volatile instead of synchronized?

I want to know if using volatile in this scenario will give a better performance than using synchronization. Specifically for the paused and running instance variable in the SimulationManager class. ...
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1answer
87 views

Timing/Synchronization issues with interrupt-reliant code

I've started to program a state machine on a PIC18F2550 microcontroller. In each state of my machine, there is a designated block of code that runs for a specific amount of real time, such as 20 or 30 ...
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1answer
981 views

Producer/Consumer with some limitations

The code realizes producer/consumer problem with multiple producers and consumers. Have this code any potential deadlock or races? ...
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2answers
267 views

Invoking a callback on a pool of threads

This class acts like a synchronization context except the work could be done on any one of the available threads. I've done quite a bit testing on my own, but I'm generally concerned about potential ...
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1answer
1k views

Interview example [closed]

Recently I participated in an interview for a Russian company in Moskow and could not answer some of the simple questions. One of them I would like to ask here. List all problems which you can see in ...
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2answers
825 views

Synchronization in EJBs

Inspired by Is this synchronized correctly? I want to ask if this code is good. I have an Java Enterprise application running in Glassfish 2.1 and a Java SE client that communicates with the server ...
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4answers
435 views

Is this synchronized correctly?

I've never really done anything with concurrency, so I'm not sure if this is done correctly. Basically I have a Class that handles all messages from the server and decides what to do them. It uses a ...
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1answer
4k views

Boost Threads - Producer Consumer threads with synchronization

Please review this for concurrency correctness: ...
3
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4answers
2k views

Java Non Reentrant Lock Implementation

I have implemented a Non Reentrant Lock. I want to know if this has any mistakes, race conditions etc. I am aware of the fact that existing libraries have to be used (instead of writing our own), but ...
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309 views

Concurrency limit map in Go

Task: per host concurrency limits for web crawler (map[string]Semaphore). I considered chan struct{} (chan bool) approach, but ...