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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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
61 views
Thread lock algorithm
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
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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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0answers
86 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 ...
4
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1answer
50 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
247 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
44 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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0answers
39 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
71 views
Reader/writer spinlock
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
268 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
1k 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 ...
4
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2answers
553 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?
...
4
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2answers
322 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 ...
7
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1answer
419 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
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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
133 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
votes
1answer
76 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
270 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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votes
2answers
6k 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 ...
5
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2answers
253 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
185 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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0answers
244 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 ...
3
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0answers
1k 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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2answers
1k 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
514 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 ...
3
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2answers
148 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
74 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
855 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
173 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
529 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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1answer
439 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
416 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.
...
3
votes
4answers
1k 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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212 views
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
290 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
220 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 ...
2
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1answer
365 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
votes
1answer
643 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
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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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1answer
507 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
1k 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.
...
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1answer
504 views
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2answers
558 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?
...
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3answers
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Correct use of Monitor.Wait, Monitor.Pulse and timeout
I have the following code that I use to determine if connection has been made to a communications device.
I am unsure if my use of Monitor.Wait and ...
