3 ms·

Can you give me an example which languages do this?

• matsemann 4y ago
  In Kotlin for instance you can execute your coroutines with different "dispatchers", which have different behaviors. You can for instance use a dispatcher with multiple threads in a threadpool, run it in the main thread, a specific thread, in threads with low/high priority etc. Basically allowing you to write code using the async/coroutine paradigm, but then control its execution from the outside. So I've also used coroutines in Kotlin for CPU bound tasks with a nice speedup, where multiple sub-tasks get executed in parallel and then gathered when needed to produce new tasks etc., in a granular way that would be very intrusive doing with threadpools. Here I basically took the existing coroutine code and slapped some more threads on it. With that said, I'm not entirely sold on Kotlin's way either. Both Kotlin and Python have the "what color is your function" problem.
  • tmh88j 4y ago
    > In Kotlin for instance you can execute your coroutines with different "dispatchers", which have different behaviors. You can for instance use a dispatcher with multiple threads in a threadpool, run it in the main thread, a specific thread, in threads with low/high priority etc. Basically allowing you to write code using the async/coroutine paradigm, but then control its execution from the outside. I'm not very experienced with Kotlin, but that sounds similar to python's run_in_executor [1] [1] https://docs.python.org/3/library/asyncio-eventloop.html#asyncio.loop.run_in_executor https://docs.python.org/3/library/asyncio-eventloop.html#asy...
• throwaway81523 4y ago
  Look at seastar.io which is an async concurrency library for C++. It is painful in that it resembles node.js but it is very performant. I'd be interested in seeing a version adapted to use C++20 coroutines.