c - fork() 的执行顺序？

Question

int main () { 

    fork ();     
    fork ();     
    fork (); 

    pf (" hi\n"); 

} 

“hi”会打印多少次？ fork() 的执行顺序是什么？ 操作系统:linux 编译器:gcc

Answer 1

问题 1:“hi”会打印多少次？

                      Due to first Fork
                             |
                   -------------------------
                   |                        |
             Due to second fork         Due to second fork
                   |                          |
          ----------------------            ----------------------------
        |                      |            |                          |
  Due to 3rd fork        Due to 3rd fork   Due to 3rd fork             Due to 3rd fork
        |                      |                |                           |
------------------       ---------------       ----------               ------------
|               |        |             |      |          |               |          |
process-1     process-2   process-3   process-4 pr-5     pr-6         process-7    process-8

所以 如果所有 fork 进展顺利，则总共创建 8 个进程，因此输出中将有 8 个或更少的 hi

问题2:fork()的执行顺序是什么？操作系统:linux 编译器:gcc

无法保证哪个进程将首先被安排，哪个进程将被安排在第二个。 这一切都取决于调度程序。