c - 如何检查上下文是否已完成并继续到 uc_link？

Question

我在 C 中设置了一个调度程序，并经常使用 setcontext 和 swapcontext。

我正在为一个函数设置上下文并使用计时器切换到其他函数，但我不知道如何检查该函数是否已完成并已进入 uc_link。

代码太长而且它是一个库，所以它不完整，所以这里是它应该做什么的伪代码

addThread(someFunction)
    if scheduler not setup
        setupScheduler()
    end

    setup context for someFunction
    insert to queue
end

schedule()
    if current context is not completed or was interrupted by timer
        move current context to end of queue
    else //it is completed
        do not add back into queue or setup something to skip when next in queue
    end

    setcontext to first in queue
end

setupScheduler()
    make ucontext_t for scheduler

    swap to context of schedule() whenever SIGVTALRM triggers
    setup timer to trigger SIGVTALRM after 25ms
end


main()
    addThread(foo)
    addThread(bar)

    while(1); //busy work
end