All rights reserved. Security; using System. Remoting; using System. Permissions; using System; using Microsoft. Win32; using System. CompilerServices; using System. ConstrainedExecution; using System. InteropServices; using System. Versioning; using System. Generic; using System. Contracts; using System. CodeAnalysis; using System. If we raced and lost, we start over again. If equal, we can skip the lock. Take it. Length ; Contract. WillNotCorruptStateCer.

Assert null! Assert Volatile. We enqueue to the head, and dequeue from the tail. IsEnabled EventLevel. VerboseFrameworkEventSource. ThreadPool FrameworkEventSource. ThreadPoolEnqueueWorkObject callback ; if null!

CompareExchange ref head. Nextnew QueueSegmentnull ; while head. CompareExchange ref queueHeadhead. LocalPop out callback Contract.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. But i can't give any parameters to the callback function. How can i achieve this? RegisterWaitForSingleObject has a Context parameter for exactly the purpose of passing user-defined data to the callback. For example:. RegisterWaitForSingleObject should be used when you want to wait on an object asynchronously in the background while you move on to do other things in the meantime.

Don't wait on the wait operation. The OS will notify you when the object is signaled. Learn more. Asked 1 year, 1 month ago.

Active 1 year, 1 month ago. Viewed times.

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Hack4fun Hack4fun 51 1 1 silver badge 5 5 bronze badges. You don't pass any parameters there, just the function pointer. What should be passed to the callback is specified in the other parameters of the RegisterWaitForSingleObject function.

I'd recommend you read the MSDN documentation thotoughly again, and have a look at the examples. Can you share some source link? Active Oldest Votes. Remy Lebeau Remy Lebeau k 23 23 gold badges silver badges bronze badges.


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Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. However, this implementation requires me to "join" the thread from the start caller, which effectively blocks the caller of the start function. Bascially I want to be able to do a task, and wait a few seconds and batch do a single batch task B after a few seconds. I have tried modifying the above code using the thread. However, I am running issues in detached thread not being able to write erase from the database.

Rather than using threads you could use std::async. The following class will process the queued strings in order 4 seconds after the last string is added. Only 1 async task will be launched at a time and std::aysnc takes care of all the threading for you. If there are unprocessed items in the queue when the class is destructed then the async task stops without waiting and these items aren't processed but this would be easy to change if its not your desired behaviour.

Learn more. Asked 1 year, 7 months ago. Active 1 year, 7 months ago. Viewed 2k times. What I really like to do is the following. Any help and suggestions are appreciated! Dillon Dillon 2 2 silver badges 15 15 bronze badges.

Could you add a sample of how you are using this class? What you are asking for seems risky and unnecessary. Maybe you can construct the thread in constructor and join it in destructor? Then you only need a std::queue to add new items callbacks into by start and flush all elements by stop.

Once it goes out of scope, destructor will take care of thread. Then there would be a while loop in thread, yields until queue has any item.

Then starts processing it.

RegisterWaitForSingleObject function

Next while loop would check both timer and number of items. Inside, it would process items 1 by 1. Then let it repeat until stopped. Destructor will do the cleaning. I guess interval is waiting between items and delay is just its trigger time. Active Oldest Votes. Alan Birtles Alan Birtles Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name.Represents a method to be called when a WaitHandle is signaled or times out.

The following example shows how to use the WaitOrTimerCallback delegate to represent a callback method that is executed when a wait handle is signaled. The example also shows how to use the RegisterWaitForSingleObject method to execute a specified callback method when a specified wait handle is signaled. The example defines a TaskInfo class to hold the information that is passed to the callback when it executes. The example creates a TaskInfo object and assigns it some string data.

If the callback was invoked because the wait handle was signaled, the WaitProc method unregisters the RegisteredWaitHandlestopping further callbacks. In the case of a timeout, the task continues waiting. The WaitProc method ends by printing a message to the console. WaitOrTimerCallback represents a callback method that you want to execute when a registered wait handle times out or is signaled. Create the delegate by passing your callback method to the WaitOrTimerCallback constructor.

Your method must have the signature shown here. Your callback method executes each time the WaitHandle times out or is signaled. Visual Basic automatically calls the correct delegate constructor. If you want to pass information to your callback method, create an object that contains the necessary information and pass it to RegisterWaitForSingleObject when you create the registered wait handle.

Each time your callback method executes, the state parameter contains this object. For more information about using callback methods to synchronize thread pool threads, see The managed thread pool.

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Skip Submit. GetMethodInfo Delegate.In this article we will show how to use timer queues to create fast, lightweight, multi-threaded OnTimer events that work on Windows and Linux in a uniform method using our helper class TgoTimerQueue. We also discuss how they operate on Windows and Linux and show an example application using timer queues.

For more information about us, our support and services visit the Grijjy homepage or the Grijjy developers blog. The example contained here depends upon part of our Grijjy Foundation library. You are probably already familiar with Delphi timer objects. You set an interval and your OnTimer event is called at the given interval. Timer queues are a bit different. They provide a lightweight object to handle numerous timers that fire at different intervals.

These lightweight objects are handled from a thread pool that is managed by the operating system so that multiple timers can be handled by a single thread. If your callback event executes fast enough so that it take less time than the internal rate of the timer, then it is possible for the operating system to use only a single thread to call your OnTimer events.

However the operating system handles the issues related to making sure that more threads are used if other OnTimer events must be called. Timer queues tend to be much more precise in their interval rate and scale up more efficiently than traditional timers. Since they are operating from a thread, you have to make sure anything you do within the event itself is thread-safe.

With traditional Delphi timers your OnTimer events are happening in the main application thread so this is not an issue. However, this may be a problem for existing code that is not thread-safe or a may be a benefit if you need your timer events to happen in the background. These APIs allow you to define a queue to manage the timers and create individual handles to timer objects. With each given handle you specify an interval rate and a callback procedure.

In the above example, Handle is an out parameter that contains the resulting handle of the timer object once it is created. TimerQueueHandle is the primary handle for the timer queue. WaitOrTimerCallback is your callback procedure that is called for every timer event. The API allows you to specify your own user data, so in this case we provide our own MyObject that we will retrieve in the callback event.

The stdcall procedure will be called for each interval for each and every timer in the queue. In other words, you can expect this event to be called by multiple threads and it needs to be completely thread safe. The DeleteTimerQueueTimer method will block until all the pending callbacks for this specific timer object are completed.

These are used in conjunction with the EPoll APIs to manage a queue of lightweight timer objects from a thread pool. Just like Windows timer queues, multiple timer objects can be handled by the same thread or different threads allowing your application using timer objects to scale up more efficiently. Our MyObject is assigned to the Event data. To access the timerfd related APIs we added a new import header unit called Linuxapi.

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Timerfd that is part of the Grijjy Foundation library. You perform this inside one or more worker threads. Each of the threads will wait for a timer interval, but only one of the threads will handle the event.

This allows Epoll to load balance multiple timer events across a thread pool. This clears the timer event from the queue. To make it easy to use, we created the TgoTimerQueue class that operates on both Windows and Linux in a uniform manner.

Each timer has a different handle. We also show the ThreadId so it is clear that that your OnTimer event needs to be thread-safe. Please note that in our example code we call Writeln to the console.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

I want a given operation to execute for a certain amount of time.

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When that time has expired, send another execution command. TimeoutAfter Method. The beauty of Task. TimeoutAfter is that it is very easy to compose it with other continuations becaused it does only a single thing: notifies you that the timeout has expired. It doesnt' try to cancel your task. You get to decide what to do when a TimeoutException is thrown. EDIT: If the original questioner wants an asynchronous method that will cancel after a specific period: assuming the method would not be making any network requests but just be doing some processing in memory and the outcome can be aborted arbitrarily without considering its effects, then use a cancellation token:.

EDIT : I should have mentioned you can catch the resulting OperationCanceledException providing the indication on how the Task ended, avoiding the need to mess around with bools. Here's how I'd do it, using task cancellation pattern the option without throwing an exception.

Learn more. How to implement Task Async for a timer in C? Ask Question. Asked 6 years, 7 months ago. Active 5 years, 4 months ago. Viewed 14k times. StartDoingStuff ; System. Yves M. ElHaix ElHaix I'm confused, you ask about async - awaitwhich is a new feature of C 5. So, which one is it? ElHaix Others seem to be suggesting not throwing the exception.

The Async Await Episode I Promised

It is normal to throw the exception as the code will be more elegant, maintainable and is a good way to implement the Task Cancellation Pattern - "use the ThrowIfCancellationRequested method. A task that is canceled in this way transitions to the Canceled state, which the calling code can use to verify that the task responded to its cancellation request.

Use the exception to simplify all the logic. I'd repeat my comment here. Active Oldest Votes. SetException new TimeoutException ; return tcs. Create timer, tcsCancellationToken.You seem to have CSS turned off.


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Nice you found that. Looking forward to hear from you server wise. If you have questions you can also join our irc channel freerdp freenode. Best regards, Bernhard. Anyone else compile on OS X recently?

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Thanks, Peter. I've compiled on Mavericks recently 2 days ago so does our pull request builder on every pull request. Until now I haven't seen this problem. But I'll retry later this evening to recheck.


Looking at the line number from the error above. I wonder which version you are trying to compile. For current master the line number doesn't make much sense. Just for a little more info, I ran make -n to get the clang command that's being run. I ran clang -E and looked at the preprocessor output. It looks like clang is looking for headers in my MacPorts installation first.

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I had already installed the FreeRDP port and was disappointed to find that it included only the client not the server as well. Thanks for helping, Bernhard--I'll let you know how the server goes.

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