进程调度有问题

SIG - Main
1

先贴上测试代码

pid_t reader_pid;

  // Case 2: Reader exists but disconnects
  reader_pid = fork();
  if (reader_pid == 0) {
    // Child process acts as a reader
    int reader_fd = open(FIFO_PATH, O_RDONLY);
    if (reader_fd == -1) {
      perror("Reader failed to open FIFO");
      exit(EXIT_FAILURE);
    }
    sleep(2); // Simulate a brief existence of the reader
    close(reader_fd);
    exit(EXIT_SUCCESS);
  }

  sleep(5); // Ensure the reader has opened the FIFO
  FifoWriteResult result = test_fifo_write(1, nonblocking);
  waitpid(reader_pid, NULL, 0); // Wait for the reader process to exit

测试代码期望子进程可以在父进程醒来之前醒来关闭管道读端。

运行测试会得到以下结果：

  1. 两者同时醒来（可以通过连续捶打回车键稳定复现）
  2. 子进程在父进程醒来之后醒来
  3. 期望情况
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2

已初步解决：

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