I am looking at improving a package that I believe not to be threadsafe when its input is shared between multiple worker threads. According to TDD principles, I should write some tests that fail in the first instance, and these would certainly be useful in assessing the problem. I realise that this is not a simple thing to acheive, and...
Hello, I am looking for information on using a treeview in safethread manner. Does any one have experance with this or know of some online links to research. Thanks ...
Does anybody know of a fully thread-safe shared_ptr implementation? E.g. boost implementation of shared_ptr is thread-safe for the targets (refcounting) and also safe for simultaneous shared_ptr instance reads, but not writes or for read/write. (see Boost docs, examples 3, 4 and 5). Is there a shared_ptr implementation that is fully th...
Is the following construct thread-safe, assuming that the elements of foo are aligned and sized properly so that there is no word tearing? If not, why not? Note: The code below is a toy example of what I want to do, not my actual real world scenario. Obviously, there are better ways of coding the observable behavior in my example. u...
Hi all, This is a detail question for C#. Suppose I've got a class with an object, and that object is protected by a lock: Object mLock = new Object(); MyObject property; public MyObject MyProperty { get { return property; } set { property = value; } } I want a polling thread to be able to query ...
I was pondering language features and I was wondering if the following feature had been implemented in any languages. A way of declaring that an object may only be accessed within a Mutex. SO for example in java you would only be able to access an object if it was in a synchrnoised block and in C# a Lock. A compiler error would ensue i...
Is simply enumerating a .NET Dictionary from multiple threads safe? No modification of the Dictionary takes place at all. ...
I'm writing some code where the UI thread need to communicate with the background thread doing network communication. The code works, but would it be considered thread safe? I would feel a lot better if someone experienced could lead me on to the right path on this... static Mutex^ mut_currentPage = gcnew Mutex; static array<unsigned c...
Time and time again I find myself having to write thread-safe versions of BindingList and ObservableCollection because, when bound to UI, these controls cannot be changed from multiple threads. What I'm trying to understand is why this is the case - is it a design fault or is this behavior intentional? ...
For various common reasons I wanted to use tracing for my ASP.NET application. Especially since I found out about the possibility to use the Service Trace Viewer tool which allows you to examine your traces in a powerful way. Since I had never used this trace thing before, I started stuying it. After a while of Google, SO and MSDN I fin...
Question How can I make sure my application is thread-safe? Are their any common practices, testing methods, things to avoid, things to look for? Background I'm currently developing a server application that performs a number of background tasks in different threads and communicates with clients using Indy (using another bunch of automa...
Hi, Last May at Railsconf on Portland, I went to a presentation where it was argued that, in Rails, Ruby class member variables, like @@foo, are dangerous because they are inherently unthreadsafe. I researched the question afterward and I never found a link that really fleshed out the question. I would appreciate a pointer to a good ...
I use a table with one row to keep the last used ID (I have my reasons to not use auto_increment), my app should work in a server farm so I wonder how I can update the last inserted ID (ie. increment it) and select the new ID in one step to avoid problems with thread safety (race condition between servers in the server farm). ...
I read in the MS documentation that assigning a 64-bit value on a 32-bit Intel computer is not an atomic operation; that is, the operation is not thread safe. This means that if two people simultaneously assign a value to a static Int64 field, the final value of the field cannot be predicted. Three part question: Is this really true? ...
I have some parallel Fortran90 code in which each thread needs to generate the same sequence of random numbers. I have a random number generator that seems to be thread-unsafe, since, for a given seed, I'm completely unable to repeat the same results each time I run the program. I surfed unsuccessfully (almost) the entire web looking...
I can't get to the bottom of this error, because when the debugger is attached, it does not seem to occur. Below is the code. This is a WCF server in a Windows service. The method NotifySubscribers is called by the service whenever there is a data event (at random intervals, but not very often - about 800 times per day). When a Windows...
Hi, I've got a relatively expensive data-fetching operation that I want to cache the results of. This operation is called from const methods, roughly like this: double AdjustData(double d, int key) const { double factor = LongRunningOperationToFetchFactor(key); return factor * d; } I'd like AdjustData to remain const, but I want ...
As long as concurrent calls don't cause seg-v's or return the same value, what reasons are there for preventing race conditions and data corruption in PRNGs when those error's primary effects are unpredictable results and that is the point of a PRNG? Edit: are there any PRNG that wouldn't suffer under race conditions and data corrupti...
Also, does the object that is being set have to be thread safe in order to guarantee that we know what the state of the object stored in session is known. Also, I was reading on the web that some suggest using: synchronized(session) { session.setAttribute("abc", "abc"); } Is this a valid suggestion? ...
I've been using NHibernate for a while now and have found from time to time that if I try to request two pages simultaniously (or as close as I can) it will occasionally error. So I assumed that it was because my Session management was not thread safe. I thought it was my class so I tried to use a different method from this blog post h...