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  1. #include <stdio.h>
  2. #include <unistd.h>
  3. #include <sys/types.h>
  4. #include <sys/wait.h>
  5.  
  6. int main() {
  7.     pid_t pid1, pid2;
  8.  
  9.     pid1 = fork();
  10.     if (pid1 < 0) {
  11.         fprintf(stderr, "Fork Failed\n");
  12.         return 1;
  13.     } else if (pid1 == 0) {
  14.         lockf(1, 1, 0);
  15.         printf("饿\n");
  16.         fflush(stdout);
  17.         lockf(1, 0, 0);
  18.         return 0;
  19.     }
  20.  
  21.     // 父进程先等子进程1结束，再创建子进程2
  22.     waitpid(pid1, NULL, 0);
  23.  
  24.     pid2 = fork();
  25.     if (pid2 < 0) {
  26.         fprintf(stderr, "Fork Failed\n");
  27.         return 1;
  28.     } else if (pid2 == 0) {
  29.         lockf(1, 1, 0);
  30.         printf("吃饭\n");
  31.         fflush(stdout);
  32.         lockf(1, 0, 0);
  33.         return 0;
  34.     }
  35.  
  36.     // 再等子进程2结束
  37.     waitpid(pid2, NULL, 0);
  38.  
  39.     lockf(1, 1, 0);
  40.     printf("饿就吃饭\n");
  41.     fflush(stdout);
  42.     lockf(1, 0, 0);
  43.  
  44.     return 0;
  45. }
Success #stdin #stdout 0s 5328KB
comments (?)
stdin
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Standard input is empty
stdout
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饿
吃饭
饿就吃饭
https://ideone.com/hdvd2a
language:
C++ (gcc 8.3)
created:
9 hours ago
visibility:
public

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