I am a huge fan of parallel and async code. I spend a lot of time researching it and trying to design software that is easily parallelisable. Many GUIs use the

I am a huge fan of parallel and async code. I spend a lot of time researching it and trying to design software that is easily parallelisable. Many GUIs use the event/message pump pattern, such as Windows 32 API. Qt does something with its event loop (QEventLoop) Threads are a rather low level instrument to get background tasks going because the interface between the main thread and the threads is rather omitted. In Java you could use a ConcurrentLinkedQueue. And in Python you can use JoinableQueue. I am heavily interested in this space because I want to write understandable software that anybody can pick up and work with. I worked on a JMS log viewer that used threads but would crash with ConcurrentModificationException due to not being thread safe. I changed it to be thread safe but its performance dropped through the floor. In my learnings since then I should hast sharded each JMS connection topic to its own thread or multiplexed multiple JMS topics per thread and loop over them. The main thread can interrogate the thread with a lock, that should be faster than every thread trying to acquire the lock. It would be driven by the main thread but the work is done in the background. The threads can keep the fetched messages in memory until the main thread is ready for them. I think with the right abstraction, thread safety can be achieved and concurrency shouldn't be something to be afraid of. It is very difficult and challenging working at the low levels of concurrency such as a concurrent browser engine. (I've not done that though.) This is why languages such as Pony lang, Inko, Cyber and Erlang, Elixir are so promising. We can build high performance systems that parallelise. Writing an async/await pipeline that looks synchronous is far easier to understand and maintain than nested callbacks. So I can see where async is useful. I just hope we can design async software to be simpler to maintain and extend.