cooperative thread pool test code

thread_pool.swift

import Foundation

// reference: https://stackoverflow.com/questions/67978028/maximum-number-of-threads-with-async-await-task-groups

func run() async {
    await withTaskGroup(of: Void.self) { group in
        for i in 0 ..< 32 {
            group.addTask {
                print(await fire(i))
            }
        }
    }
}


func run2() {
    DispatchQueue.global().async {
        DispatchQueue.concurrentPerform(iterations: 32) { i in
            print(fire2(i))
        }
    }
}

func fire(_ i: Int) async -> Int { i }
func fire2(_ i: Int) -> Int { i }

Task {
    await run()
}

run2()