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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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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69 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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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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182 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
89 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
72 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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113 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
111 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
258 views

Script to enter text in a box

Here's a little script that enters text into a document when activated. ...
5
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1answer
46 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
92 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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0answers
98 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 ...
6
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2answers
481 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
2k 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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810 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
740 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
562 views

Portable C++ boost::iterprocess::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
2k 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
155 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 ...
3
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1answer
106 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
339 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
9k 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
317 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
201 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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272 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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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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2answers
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
567 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
156 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
80 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
908 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
203 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
726 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
538 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
420 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
3k views

Boost Threads - Producer Consumer threads with synchronization - Review

I have below code for multi threaded consumer and single producer. Kindly review it ro concurrency correctness. ...
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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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Concurrency limit map in Go

Please someone who knows locks, mutexes, and Go, review the following code. Task: per host concurrency limits for web crawler (map[string]Semaphore). I considered chan struct{} (chan bool) approach, ...
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4answers
317 views

Configurable synchronization approach in Java

I am interested in the community opinion about the following approach for the synchronization. Generally it is based on the idea to have a configurable way to apply locking on some logic parts. Any ...
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1answer
255 views

Usage of Conditions Variables with Pthreads [closed]

This is just a program to show the use of condition variable when two threads are involved. One thread wants a non zero value of count, and other thread is responsible for signaling it when the count ...
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1answer
411 views

How improve a get/set method of a webservice using EclipseLink and database entities?

I am wondering if this is a correct and a good way to write the implementation of two web service methods (get/set method). The setPerson method can be called ...
3
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1answer
665 views

RealTime Collaborative Editor: A CodeMirror extension for MobWrite

I wrote up the following script for the realtime-synchronization service, MobWrite to be used with the browser-based editor, CodeMirror: ...
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2answers
4k views

Thread-safe std::map accessor

After learning that std::map containers are not inherently atomic and therefore not thread-safe (check out this related Stack Overflow question and usage example), ...
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5answers
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2
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1answer
562 views

What do you think about resource locker in Qt?

The idea is to lock resource, in c# or java way un Qt with code lock(obj){/*process with locked obj*/} No I see, the problem with deleting obj under lock. ...
2
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0answers
2k views

Gmail contacts API connection

I created this class that connects to Gmail contacts, and enables you to add/edit/delete the contact. I'm curious to see what others think of my code. If you see any areas for improvement, that ...
4
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2answers
2k views

Best practice for synchronization of an ODBC connection?

Since I'm venturing more and more into the Multi-Threaded lands, I now need to think about how to protect my precious OdbcConnection from breaking at random times. ...
7
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1answer
522 views
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2answers
597 views

Making sure all elements are processed in a JQuery call

I have a piece code similar to below: But I keep having this nagging feeling that there has to be an easier way! Any ideas? ...