Questions tagged [concurrency]
In computer science, concurrency is a property of systems in which multiple computations can be performed in overlapping time periods. The computations may be executing on multiple cores in the same chip, preemptively time-shared threads on the same processor, or executed on physically separated processors.
concurrency
23,313
questions
4
votes
3
answers
3k
views
WaitForMultipleObjects in Java
What would be the most elegant way to implement a Win32 equivalent of WaitForMultipleObjects in Java (v6). A thread is sleeping until one of several events occur. When that happens, I want to process ...
- 4,098
1
vote
2
answers
186
views
Time restricted service
i'm developing an app that make requests to the Musicbrainz webservice. I read in the musicbrainz manual to not make more than one request per second to the webservice or the client IP will be blocked....
- 14.4k
4
votes
2
answers
980
views
Die you threadpoolexecutor
I have a java.util.concurrent.Execution service - a single threaded thread pool executor. I submit certain tasks to it. If the task throws an unchecked exception the thread dies but the service ...
- 1,643
6
votes
5
answers
726
views
Inter-Image communication in Smalltalk. Possible?
I have a graph-traversal problem that is beautifully and elegantly modeled in smalltalk, but it's too big (in terms of computation and storage) for one smalltalk image instance. So, I want to ...
- 4,356
1
vote
4
answers
1k
views
Is it safe to use writeLock without readlock?
Assuming this is a "singleton" implementation: Am I guaranteed that this will only call productCatalogLoader.load() once, and also that no nullpointers can happen ? Any way to make this simpler ?
...
- 76.5k
1
vote
3
answers
9k
views
NHibernate and sql timestamp columns as version
I've been racking my head trying to get Nhibernate to work with a byte
array as version mapping to an sql timestamp. I'd implemented an
IUserVersionType but Nhibernate was creating varbinary in the ...
- 765
120
votes
10
answers
110k
views
What is mutex and semaphore in Java ? What is the main difference?
What is mutex and semaphore in Java ? What is the main difference ?
- 8,641
4
votes
5
answers
2k
views
What Java Data Structure/Solution would best fit these requirements?
I need a java data structure/solution that meets these requirements. What best fits these?
1) Object's insertion order must be kept
2) Object's must be unique (These are database objects that are ...
- 14k
0
votes
2
answers
1k
views
Limit the number of concurrent connections from the server side?
I'm writing my own webserver and I don't yet handle concurrent connections properly. I get massive page loading lag due to inappropriately handling concurrent connections (I respond to SYN, but I ...
- 5,805
2
votes
2
answers
4k
views
java.util.ConcurrentModificationException in JasperReports
We have a web application deployed to Websphere 6.1.0.19 on Windows. We occasionally see this ConcurrentModificationException on a few of our reports. We are using JasperReports 2.0.5 in production. ...
tom
9
votes
3
answers
4k
views
What's the upcoming Java concurrency library: jsr166y? jsr166z?
I wanted to play around with the upcoming concurrency library which
is going to be included in
Java 7 according to this website.
It seems to be named JSR166.
In most places its reference ...
- 19.4k
17
votes
7
answers
6k
views
Does lock(){} lock a resource, or does it lock a piece of code?
I'm still confused... When we write some thing like this:
Object o = new Object();
var resource = new Dictionary<int , SomeclassReference>();
...and have two blocks of code that lock o while ...
- 11.1k
53
votes
3
answers
15k
views
Concurrency in a GIT repo on a network shared folder
I want to have a bare git repository stored on a (windows) network share. I use linux, and have the said network share mounted with CIFS. My coleague uses windows xp, and has the network share ...
- 707
10
votes
4
answers
6k
views
Understanding Goetz's article on Thread safety of HttpSession
Referring to Brian Goetz's article Are all stateful Web applications broken? for IBM developerWorks, I want to refer to this piece of code
HttpSession session = request.getSession(true);
ShoppingCart ...
- 47.1k
2
votes
2
answers
677
views
Can anyone recommend a concurrent, real-time diagramming/flowchart collaboration tool? [closed]
I'm looking to work with others to quickly build a rather large class flow diagram that may or may not be strict UML. Can anyone recommend a networked, concurrent collaboration tool for such a task? ...
- 67.3k