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 :

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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);
Node child = rows.getChild(1);
Node child = rows.getChild(2); // Exception!
 while (rows.hasChildNode()) {
for (int i = count; i >= 0; i--) {
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() {
      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
    object cached = HttpContext.Current.Cache["key"];
    if(cached == null) 
        cached = HttpContext.Current.Cache["key"];
        if (cached == null) 
          cached = new GetRolesFromDb(...);
          HttpContext.Current.Cache["key"] = cached; 
    return (Roles)cached;

public void ClearRoles()
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)

        if (_bag.Count > _threshold)

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

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

    public void Dispose()

    public Task ConsumeBag(ConcurrentBag<T> bag)
        // post entries to the api
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