2,398 questions
1
vote
4
answers
89
views
Why only creating a task will run the coroutine in python?
There is something I can't understand in this code
import asyncio
async def fetch_data(param):
print(f"Do something with {param}...")
await asyncio.sleep(param)
print(f"Done ...
- 2,191
2
votes
1
answer
140
views
boost.asio : how to cancel a synchronous task
The following code simulates short bursts of work by sleeping 1ms at a time in order to achieve a cancellable task that takes a total of 2s. That work is then launched in three different ways.
The ...
- 2,088
5
votes
1
answer
346
views
How to use C++ coroutine with Qt?
I am trying to use coroutines with Qt.
Here's minimal(I guess) example to reproduce my problem
Basically, bellow code is adopted from the example of cppreference here:
https://en.cppreference.com/w/...
- 2,326
1
vote
1
answer
155
views
Why calling longjmp in a non-main stack causes the program to crash?
The following code attempts to create a simple stackful coroutine. It allocates a stack frame in the heap space by setting the rsp register and then calling a function. Afterwards, it exits the ...
- 151
2
votes
0
answers
62
views
How can I dynamically trace and visualize memory allocation patterns of nested Python coroutines in real-time?
I'm trying to understand how memory is used in my async Python application. I have multiple coroutines running, and I want to see how much memory each one is using, especially when they are nested or ...
- 218
0
votes
1
answer
84
views
How does async / await work, in a simplified abstract sense?
I am trying to understand how async / await works from a high-level, semi-abstract perspective.
There are quite a few long and complicated explanations of async / await online, some of which appear ...
- 427
1
vote
0
answers
103
views
Coroutine with RAII using Boost.Asio
I'm writing some test code using Boost.Asio with C++20 coroutines.
Working version (manual cleanup, non-RAII)
The following code works as expected. Cleanup is always called, even when an exception is ...
- 3,580
-1
votes
1
answer
160
views
What is the idiomatic way for a coroutine to release a strand?
Let's assume I have a coroutine running on a strand. I would like the completion to be posted to the parent executor of the strand (i.e. : a thread_pool) while also releasing the strand. What is the ...
- 2,088
1
vote
0
answers
77
views
Lua preemptive multitasking and supporting nested coroutines
I am trying to write a scheduler for a virtual computer that runs Lua and is transparent to the user (i.e.; no coroutine. yields needed) and would still like the user to be able to create coroutines ...
- 178
2
votes
1
answer
122
views
declare return_void / return_value conditionally
I've tried std::enable_if and requires:
template <typename Ret>
struct promise_type {
auto get_return_object() {/*...*/}
auto initial_suspend() {/*...*/}
auto return_void()
-> std:...
- 507
3
votes
1
answer
102
views
Are `std::noop_coroutine` and `noop_coroutine_handle` redundant?
In GCC 15, std::noop_coroutine's definition is
{ return std::noop_coroutine_handle(); }
std::noop_coroutine_handle is defined by:
using noop_coroutine_handle = std::coroutine_handle<std::...
- 507
2
votes
0
answers
90
views
C++ Coroutine task class strange issue
Basically, the whole idea is something like the Task implementation in C# where functions can return Task<T> that callers can await on. For some reason, TestFuncAsync runs correctly the first 2 ...
- 29
-7
votes
1
answer
265
views
Are Cgo implementing functions allowed to arbitrarily manipulate the stack pointer? [closed]
I would like to know whether Cgo implementing functions are allowed to arbitrarily manipulate the stack pointer. The motivation for this is to allow the use of coroutines on the C side of the call. ...
- 214
0
votes
0
answers
68
views
When is `async for` faster than `for` (python)?
In python, one can replace for [...] in [generator] by async for [...] in [awaitable generator]. Clearly, this lowers the overall execution time of a program if the [generator] contains some slow I/O ...
- 137
0
votes
1
answer
53
views
Android, how to print out coroutine id or name on a custom log function
I want to modify this log helper function to print out coroutine id or name.
@JvmInline
value class MyLogger(private val tag: String) {
fun log(level: Level, e: Throwable? = null, ...
- 273