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Why is this async function is running synchronously?


Why is this async function is running synchronously?

By : pap
Date : January 12 2021, 07:00 PM
With these it helps Setting something as async will wrap the return object into a Promise. Promises are used to deal with asynchronous behavior, but there's nothing inherently asynchronous about the content of the test function. If instead you were to wrap the contents into a setTimeout function, that would cause a delay which would mimic asynchronous behavior and match the outcome you were expecting.
code :
async function test() {
  setTimeout(() => {
    for(let i = 0; i < 2; i++){
        console.log("test");
    }
  })
}

console.log("a");
test();
console.log("b")


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Problems running async method with return value synchronously in C#

Problems running async method with return value synchronously in C#


By : meryem m'hachi
Date : March 29 2020, 07:55 AM
hope this fix your issue In ReferenceRunAsync, when you use await, the current synchronization context (typically the UI thread's context) is captured, and the continuation (what follows the await instruction) is run on that synchronization context. But since you are synchronously waiting for the result in ReferenceRun, the thread is already busy and can't execute the continuation, so you have a deadlock. An easy fix is to call ConfigureAwait(false) on the awaited task to avoid capturing the context:
code :
return await Task.Factory.StartNew(() => {
    WaitForHalt();
    return setParameter(postitionParam, 0);
}).ConfigureAwait(false);
Async await button click always running synchronously

Async await button click always running synchronously


By : David2100
Date : March 29 2020, 07:55 AM
this one helps. Async in a WebForms application doesn't make your form behave like a client side application that sits and in an event loop and waits for events to happen. It's still a server rendered page that responds to single, transactional HTTP requests triggered by a button click or change event, with a single server rendered HTML response by the WebForm. Once rendered the page is done. There's no 'event loop' that waits for the next click.
Async in a WebForms/ASP.NET app simply allows you to offload some processing from the main thread, but it doesn't not change the behavior of the UI on the page. Think of async as a way to either run multiple operations simultaneously, or to release the main processing thread while a longer running IO operation runs in the background, then returns before the final page is rendered.
Why does std::async call the function synchronously even with the specified std::launch::async flag

Why does std::async call the function synchronously even with the specified std::launch::async flag


By : GrapeDonaldson
Date : November 15 2020, 11:01 PM
I wish this help you You actually serialize the calls by waiting for each of them, as such the same thread may be reused without breaking the specification that the std::future is executed by a thread distinct from the caller thread
Wake us up when the following code shows the same Caller ThreadId with the rest of them:
code :
void PrintThreadId()
{
    std::cout << std::this_thread::get_id() << std::endl;
}

int main()
{
    std::cout << "Caller threadId (to be different from any id of the future exec thread): ";
    PrintThreadId();

    for (int i = 0; i < 5; ++i)
    {
        auto f = std::async(std::launch::async, PrintThreadId);
        f.wait();
    }
}
Python 3.6 async GET requests in with aiohttp are running synchronously

Python 3.6 async GET requests in with aiohttp are running synchronously


By : CLED
Date : March 29 2020, 07:55 AM
To fix the issue you can do You are awaiting on separate do_request() calls in sequence. Instead of awaiting on them directly (which blocks until the coroutine is done), use the asyncio.gather() function to have the event loop run them concurrently:
code :
async def main():
    create_database_and_tables()
    records = prep_sample_data()[:100]

    requests = []
    for record in records:
        r = Record(record)

        if not r.is_valid:
            continue

        query_string = r.generate_query_string()

        requests.append(do_request(query_string))

    for resp in asyncio.gather(*requests):
        print("NOW WRITE TO DATABASE")
Async Await Running Synchronously

Async Await Running Synchronously


By : hammondam54
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Confusingly enough, the async keyword will not turn your methods magically asynchronous. Instead, you can consider async methods as a setup for a state machine (see a detailed explanation here), where you schedule the chain of operations by the await calls.
For that reason, your async methods must execute as fast as possible. Do not do any blocking operation in such a setup method. Your GetIntAfterLongWait method is a blocking operation and since it does not contain any awaits the whole content will be executed immediately when the method is called (without any await there is nothing in the method to setup for an async continuation). There must be also a warning about that.
code :
public async Task<int> GetIntAfterLongWait()
{
    await Task.Run(() =>
    {
        for (int i = 0; i < 500000000; i++)
        {
            if (i % 10000000 == 0)
            {
                Console.WriteLine(i);
            }                
        }
    });

    return 23;
}
1)
2)
<long list of ints> - but 0 can be before even 1) as Task.Run uses another thread
3)
4)
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