logo
down
shadow

Safely clear List (with concurrency)


Safely clear List (with concurrency)

By : sagar reddy
Date : November 21 2020, 07:38 AM
Hope that helps If the two actions are being undertaken from the same thread, there is no chance of a deadlock occurring.
If there are multiple threads writing/reading the list at the same time, then lock should be used (https://msdn.microsoft.com/en-us/library/c5kehkcz.aspx) to prevent multiple threads accessing the object simultaneously. See here (use the same lock object at two different code block?) for a simple example.
code :


Share : facebook icon twitter icon
Best way to safely clear data in a singleton?

Best way to safely clear data in a singleton?


By : user7092584
Date : March 29 2020, 07:55 AM
Does that help I think the answer lies not in destroying the singleton object and recreating it, but to actually clear the instance variables within that singleton object.
You don't show the declaration of [CSAppData inbox], but if it's an NSMutableArray, for example, then you can clear that, and any existing references to the singleton object can remain:
code :
+(void) clearData {
    CSAppData *appData = [CSAppData appData];
    [appData.inbox removeAllObjects];
}
Safely clear (or remove children) of a DivElement

Safely clear (or remove children) of a DivElement


By : Sanj
Date : March 29 2020, 07:55 AM
Any of those help Think about what happens in this loop. Lets take a div with three children:
int count = rows.getChildCount();
code :
Node child = rows.getChild(0);
rows.removeChild(child);
Node child = rows.getChild(1);
rows.removeChild(child);
Node child = rows.getChild(2); // Exception!
 while (rows.hasChildNode()) {
   rows.removeChild(rows.getFirstChild());
 }
for (int i = count; i >= 0; i--) {
  rows.removeChild(rows.getChild(i));
}
rows.setInnerHTML("");
rows.removeAllChildren();
Safely clear JavaScript timeout

Safely clear JavaScript timeout


By : bahar radfar
Date : March 29 2020, 07:55 AM
will be helpful for those in need Problem with this code is watch holds the last timeout only. This should fix it
code :
function myFunction() {
      DoStuff;
      if (watch) { clearTimeout(watch); }
      watch = setTimeout(myFunction, 1000);
}
How to clear ASP.NET cache thread-safely?

How to clear ASP.NET cache thread-safely?


By : Foyan
Date : March 29 2020, 07:55 AM
Hope this helps In my project I have some cached values implemented using singleton pattern - it looks like this:
code :
private object lockRoles = new object();

public Roles GetRoles
{
  get 
  {
    object cached = HttpContext.Current.Cache["key"];
    if(cached == null) 
    {
      lock(lockRoles)
      {
        cached = HttpContext.Current.Cache["key"];
        if (cached == null) 
        {
          cached = new GetRolesFromDb(...);
          HttpContext.Current.Cache["key"] = cached; 
        }
      }
    }
    return (Roles)cached;
  }
}    

public void ClearRoles()
{
  HttpContext.Current.Cache.Remove("key");
}
C# ConcurrentBag - How to safely clear on every N objects added

C# ConcurrentBag - How to safely clear on every N objects added


By : Den
Date : March 29 2020, 07:55 AM
like below fixes the issue My idea is something like a backbuffer. Once one bag is full you exchange it in an atomar operation and process it. I've sketches such a class that could handle this:
code :
public class DualBag<T> : IDisposable
{
    private ConcurrentBag<T> _bag;
    private int _threshold;
    private ManualResetEventSlim _exchangeEvent;
    private CancellationTokenSource _cts;

    public DualBag(int threshold)
    {
        _bag = new ConcurrentBag<T>();
        _threshold = threshold;
        _exchangeEvent = new ManualResetEventSlim();
        _cts = new CancellationTokenSource();
        Task.Run(() => Consume());
    }

    public void Add(T item)
    {
        _bag.Add(item);

        if (_bag.Count > _threshold)
        {
            _exchangeEvent.Set();
        }
    }

    private async Task Consume()
    {
        while (!_cts.IsCancellationRequested)
        {
            _exchangeEvent.Wait();
            _exchangeEvent.Reset();
            var _replacementBag = new ConcurrentBag<T>();
            var bag = Interlocked.Exchange(ref _bag, _replacementBag);
            await ConsumeBag(bag);
        }

        if (!_bag.IsEmpty)
            await ConsumeBag(_bag);
    }

    public void Dispose()
    {
        _cts.Cancel();
    }

    public Task ConsumeBag(ConcurrentBag<T> bag)
    {
        // post entries to the api
    }
}
Related Posts Related Posts :
  • How to get all ip address in LAN?
  • send value to controller using html.actionlink
  • Assembly "Microsoft.GeneratedCode" loaded
  • count the number of items in view in asp.net mvc
  • Shortcut Keys for Saving or Editing Record in C#
  • Very tricky/complex text formatting: How can I output a string[][] as a table?
  • Fill multiple textboxes after selecting a data from DropDownList in ASP.NET
  • How to launch an application after another is logged in in C#?
  • Unable to retrieve column values from one of the tables joined in a stored procedure?
  • Directories last file name display only
  • Why do I get a COMException when I try to initialize an Interop.Word.Application?
  • Finding subtotal for column in repeater control
  • dropdownlist item selected throw exception (stack empty)
  • How can I list IIS working processes programmatically?
  • How to access nested object from JSON with Json.NET in C#
  • OpenXml DataValidation set predefined List for columns
  • How to find recurring word groups in text with C#?
  • layout conrols to developp universal apps in windows 8.1 pro
  • Adding strings to a list via for loop xna
  • Using Vertex Arrays with OpenTK
  • Optimizing List<string>
  • C# Local variables
  • How can I merge the results of a group by Linq-to-XML query?
  • How to add Report in ASP.NET Project
  • C# How to display all instances of a loop in a label?
  • C# subscribe a function to System.Action that is subscribed to another System.Action: why does order matter?
  • Is there any negative effect to setting SqlCommand's CommandTimeout to a high value?
  • C# - TreeView Context Menu Out of Place when using keyboard
  • How to read stored procedure output and return it as list
  • How do you maintain changes made by VisualState triggers after setting another VisualState?
  • Should I be unit testing my bootstrapper and if so how?
  • using .SingleOrDefault() inside .Where() will raise the following exception:- System.NotSupportedException was unhandled
  • C# How would I fill a Form1 Parameter in the same seperate class
  • Access gridview row's data from LinkButton inside that row
  • Translating excel function to c# Math.pow not resulting in same values
  • Arranging Ten Inputted Numbers into Ascending and Descending order
  • AsEnumerable and Query Syntax
  • How can I defensively code against randomly referencing "Table 0" and null values?
  • Changing xaml code position based on screen size
  • Castle Windsor resolve ienumerable and name
  • Drawing multiple sprites with a for loop xna 4.0
  • For loop to Populate Textblocks
  • Visual Studio 2015: Create an Empty Project
  • What are .NET classes to replace the old MSXML2.ServerXMLHTTP?
  • Handle leak in .Net threads
  • Excel add-in ribbon click events bubbling
  • validation rule needed for only numbers to be entered
  • Parsing complex XML, no descendent elements exists when selecting a named element
  • Web Api - IEnumerable with complex type as param is null
  • Email address input validation
  • .Net AND operator Regular Expression using strings in a document
  • Windows phone 8.1 POST x-www-form-urlencoded not working
  • Is there any way to make my C# XMLManager work?
  • ASP.NET 5 Console Application (package) - How to create DBContext from connection string?
  • How to use form's function in other class C#
  • WPF Zebra EPL2 Printing issue
  • C# use reflection to capture exception throw
  • Convert strings in DataRow to double
  • Xml-Serialization is not working
  • HTML Agility Pack can't find classes with trailing spaces
  • shadow
    Privacy Policy - Terms - Contact Us © animezone.co