Is there a way to wait for a ManualResetEventSlim to be Reset()?

Question

Is there a way to wait for a ManualResetEventSlim to be Reset()?

David Thielen 3,211

Hi all;

The call ManualResetEventSlim.Wait() waits for the event to be set. I need the opposite, it has been set and I'm now waiting for it to be reset. Is there a way to do that?

I can't flip my event object, it is used to process a queue of messages writing them to a BLOB. But when the app is exiting, I need call Set(), the queue processing runs and writes everything, calls Reset(), and then my shutdown code can continue.

thanks - dave

Anonymous

Hi @David Thielen , Welcome to Microsoft Q&A,

Can you use a loop with a timeout to check the status periodically?

using System;
using System.Threading;

class Program
{
    static ManualResetEventSlim resetEvent = new ManualResetEventSlim(false);

    static void Main(string[] args)
    {
        // Your queue processing code here

        // Set the event when app is exiting
        resetEvent.Set();

        // Wait for the event to be reset
        WaitForReset();

        // Your shutdown code here
    }

    static void WaitForReset()
    {
        while (resetEvent.IsSet)
        {
            // You can add a timeout here if needed
            if (!resetEvent.Wait(100)) // Wait with a timeout (e.g., 100 milliseconds)
            {
                // Handle the case where the event is still set after the timeout
                Console.WriteLine("Timeout waiting for reset");
            }
        }
    }
}

1 answer

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Anonymous

2023-12-01T03:08:21.0533333+00:00

Hi @David Thielen , Welcome to Microsoft Q&A,

Can you use a loop with a timeout to check the status periodically?

using System; using System.Threading; class Program { static ManualResetEventSlim resetEvent = new ManualResetEventSlim(false); static void Main(string[] args) { // Your queue processing code here // Set the event when app is exiting resetEvent.Set(); // Wait for the event to be reset WaitForReset(); // Your shutdown code here } static void WaitForReset() { while (resetEvent.IsSet) { // You can add a timeout here if needed if (!resetEvent.Wait(100)) // Wait with a timeout (e.g., 100 milliseconds) { // Handle the case where the event is still set after the timeout Console.WriteLine("Timeout waiting for reset"); } } } }

Answer 1

David Thielen 3,211

I did something similiar. I hate polling but in this case, probably better than a second ResetEvent and the potential race conditions between them.

			_newItemEventSlim.Set();
			// wait for _newItemEventSlim to be reset
			for (var delayMilliseconds = 0; delayMilliseconds < 500; delayMilliseconds *= 2)
			{
				if (!_newItemEventSlim.IsSet)
					break;
				Thread.Sleep(delayMilliseconds);
			}

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Is there a way to wait for a ManualResetEventSlim to be Reset()?

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