Switching fiber execution to a different thread

fiber_thread_example.d

import core.thread : thread_joinAll, Thread, ThreadGroup, Fiber;
import std.stdio : writefln;

void main()
{
    writefln("Running on the main thread with id: '%s'", Thread.getThis().id);
    
    auto fiber = new Fiber(() {
        writefln("[before suspend] Running inside fiber on thread id '%s'", Thread.getThis().id);
        Fiber.yield();
        writefln("[after resume] Running inside fiber on thread id '%s'", Thread.getThis().id);
    });
    
    fiber.call();
    
    auto t = new Thread(() {
        writefln("Running on the child thread with id: '%s'", Thread.getThis().id);
        fiber.call();
    });
    
    t.start();
    
    thread_joinAll();
}