fun main() {
    println("Start of program")
    GlobalScope.launch{

        println("Starting coroutine")
        val result = someOperation()
        println("Coroutine Running thread is: ${Thread.currentThread().name}")
        println("Coroutine completed with result: $result")
        println("End of the coroutine function")

    }
    println("End of program")
}

suspend fun someOperation(): String { //This is a coroutine now (Due to suspend modifier).
    delay(3000) // long-running operation
    return "Operation performed successfully"
}

有人能解释一下为什么我的输出是这个吗？

Start of program
End of program

而预期产出是：

Start of program
Starting coroutine
Coroutine Running thread is: DefaultDispatcher-worker-1
Coroutine completed with result: Operation performed successfully
End of the coroutine function
End of program

如果协程应该在后台线程上运行，为什么在上面的例子中协程甚至没有被调用呢？
据我所知，主函数应该首先被触发，它应该产生协程（最终线程），至少在完成主函数之后，程序应该在退出之前给予协程完成的机会。

**P.S：**我在协程和异步编程方面有很大的困难。如果有人有同样的好资源，请分享它将会很有帮助。