UNIX Systems Programming

Additional Comments

• Chapter 8
  Ralf Moeller points out that there may be a problem in Linux kernel with asynchrounous I/O or Program 8.13 as this program produces a segmentation fault a few seconds after the I/O completes.
  The problem occurs when using the 2.4.20-8 kernel (standard with Redhat 9) although it does not occur with the older 2.4.4 kernel. I have not been able to reproduce this problem.
• Chapter 13
  In program 13.14, Eric Chen points out that under Linux, the default scheduling policy does not allow the changing of the thread priority. We can change to the SCHED_FIFO or SCHED_RR policy by adding code similar to the following after the second if in signalthreadinit:

     policy = SCHED_FIFO;
     if (error = pthread_attr_setschedpolicy(&highprio,policy))
        return error;