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Async task deadlocks if task is extracted first


By : Landon Starr
Date : September 17 2020, 09:00 AM
Does that help AsyncHelper.RunSync uses the thread pool hack to ensure that its delegate is called without a context, thus making it safe to block on (assuming that the delegate is safe to be called on a thread pool thread). In your code, SomeMethodAsync is executed on a thread pool thread, so any awaits will not capture a context.
code :
Func<Task<Result>> func = () => SomeClass.SomeMethodAsync();
Result r = AsyncHelper.RunSync(func);


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Task.Wait Deadlocks on a Task returned by Task.Run


By : Mary Boiko
Date : March 29 2020, 07:55 AM
I hope this helps you . I'm having a deadlock issue with some async code in 4.5. I read Stephen Cleary's blog about preventing deadlocks that occur when the task captures the executing context then in that same context you block by waiting for the Task. I tried to implement the solution but I'm still getting deadlocks and I'm not seeing why. , Try the normal async await pattern
code :
private async void Update(...)
{
    //... do some stuff ... 
   await _repository.Save(listing);
}

protected override async Task Save(...)
{

        ... do some stuff ...
        _logger.Debug("All Done!!!");
}

Calling finish() in Activity Containing two fragments both performing Async Task cant destroy and stop the async task


By : Dylan Pedersen
Date : March 29 2020, 07:55 AM
I wish this helpful for you When you call finish() the method onDestroy() will then be called, from there you should check to see if those async tasks are still running, if so, cancel them as such
code :
@Override
public void onDestroy() {
    super.onDestroy();
    if (getAsyncTaskObject() != null
            && getAsyncTaskObject().getStatus() != Status.FINISHED)
        getAsyncTaskObject().cancel(true);


}

scalaz.concurrent.Task repeatEval only evaluate Task.now and Task.async once


By : Zhi-qiang Wu
Date : March 29 2020, 07:55 AM
wish helps you As I mention in my answer to your recent question about Task, Task.async takes a function that registers callbacks—not some code that should be executed asynchronously. In the case of the other question, you actually want Task.async, since you're interoperating with a callback-based API.
Here it seems like you probably want Task.apply, not Task.delay. The two look similar, but delay simply suspends the computation—it doesn't use an ExecutorService to run it in a separate thread. You can see this in the following example:
code :
import scalaz._, Scalaz._, concurrent._

val delayTask = Task.delay(Thread.sleep(5000))
val applyTask = Task(Thread.sleep(5000))

Nondeterminism[Task].both(delayTask, delayTask).run
Nondeterminism[Task].both(applyTask, applyTask).run

Why Task stops executing on call any async method if I create it with new Task(action) -> .Start() instead of Task.Ru


By : charnuszard
Date : March 29 2020, 07:55 AM
it should still fix some issue The answer is discussed here. Essentially the Task construction takes an Action<> and not a Func<> and so the async delegate is not really being treated as such.

C# async / await question - getting "The return type of an async method must be void, Task or Task<T> even th


By : Barbara Miller
Date : September 21 2020, 07:00 PM
will be helpful for those in need Normally you have to return whatever you declare the function returns.
code :
Task<int> Bar()
{
    return Task.FromResult(1);
}
async Task Foo1()
{
    //No return needed.
}

async Task<int> Foo2()
{
    return 1; //Compiler converts the int to a Task<int> for you
}
async Task<Task<object>> Foo3()
{
    return Task.FromResult<object>(null);
}  
private async Task ClearDynamicSchedules(int accountID)
{
    log.Debug("Clearing existing schedules for account: " + accountID);

    string group = "AccountID:" + accountID;
    int count = 0;

    var groupMatcher = GroupMatcher<JobKey>.GroupEquals(group);
    var jobKeys = await this.Scheduler.Quartz.GetJobKeys(groupMatcher);
    foreach (var jobKey in jobKeys)
    {
        var detail = this.Scheduler.Quartz.GetJobDetail(jobKey);
        var triggers = await this.Scheduler.Quartz.GetTriggersOfJob(jobKey);
        foreach (ITrigger trigger in triggers)
        {
            await this.Scheduler.Quartz.UnscheduleJob(trigger.Key);
            count++;
        }
    }
    log.Debug("Schedules cleared for account: " + accountID + ", load schedules should follow. " + count.ToString() + " schedules removed");
    //No return
}
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