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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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 ...
3
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1answer
61 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
38 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
114 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 ...
5
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2answers
938 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
votes
2answers
102 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
671 views
Static classes, singleton and thread-safety
I have a classes for work with a web service (Windows Phone 8 app). I will briefly describe what doing each. My main question is the thread-safety of the ...
1
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1answer
139 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
156 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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592 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 ...
2
votes
2answers
576 views
Implementing semaphore - is this right?
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
284 views
Simple multi-threading class: Does anybody spot potential lock-based concurrency issues?
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 works ...
3
votes
2answers
114 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.
...
1
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1answer
67 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
734 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?
...
3
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2answers
140 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 ...
3
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1answer
317 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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vote
1answer
243 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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votes
4answers
391 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 ...
2
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1answer
2k 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
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4answers
971 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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0answers
157 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, ...
3
votes
4answers
232 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
167 views
Usage of Conditions Variables with Pthreads
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
283 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
566 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:
...
5
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2answers
2k views
thread-safe stl map accessor
So after learning that stl map containers are not inherently atomic and therefore not thread-safe (check out this related stackoverflow question and usage example), I decided to create code that would ...
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4answers
4k views
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1answer
424 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.
...
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0answers
2k views
Gmail Contacts API Connection Review
I created this class that connects to gMail contacts, and enables you to add/edit/delete the contact.
Curious to see what others think of my code... if you see any areas for improvement, that would ...
3
votes
2answers
997 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.
...
5
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1answer
432 views
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2answers
487 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?
...
13
votes
3answers
11k views
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 ...
