On Wednesday, November 15, 2017 11:57:25 Vladimirs Nordholm via Digitalmars- d-learn wrote: > Hello people from D-land. > > To summarise my problem: I have a program in the terminal (Posix) > with two threads: one which my main program is run on, and a > second one which polls input via `poll(...)` and `read(...)`. > > Let's call main thread T1, and a semi-blocking input-thread T2. > > Every second T2 checks if T1 is terminated by checking if the a > global flag is set to true. This is done with a > `while(global_flag)`. > > This feels to me like iffy code. So my question becomes: what is > the best way to do this check with? > > Also: I do not know that much about multithreading. __gshared is > super global in my mind, but unsafe. Also bumped into the word > mutex, but I also do not know what it means. > > > // i have tried Thread.isDaemon(true), but never managed to get > the thread to terminate. now i use `spawn(...)` and don't see a > clear way to use that. is it worth looking into even more?
If you don't know about mutexes, then I would strongly advise that you go read up on them before you do much of anything with multi-threaded code. In this case, I would suggest that you use std.concurrency with send and receive (or probably receiveTimeout) to send a message to the thread that you want to shut down. I would suggest that you read http://ddili.org/ders/d.en/concurrency.html for info on using std.concurrency. And in general, reading the entire book would likely benefit you: http://ddili.org/ders/d.en/index.html - Jonathan M Davis
