Appendix A: Sample Programs

The programs in this appendix illustrate the use of some of the features discussed in the book. The following programs are included:

"Mapping and Reading the Cycle Counter" illustrates the use of the cycle-counter.
"Getting the Time of Day Stamp" illustrates the use of gettimeofday() and shows how to test its precision.
"Interprocess Communication" illustrates some uses of arenas, semaphores, and interval timers.
"Probing the Address Space" displays the addresses assigned to a process address space, and illustrates some uses of mmap().
"Deadline Scheduling Subroutines" illustrates the use of schedctl(2) to set a deadline scheduling policy.
"Asynchronous I/O Example" illustrates the use of asynchronous I/O including four different methods of testing for I/O completion, and also shows process creation with sproc() and the use of semaphores and barriers.
"Guaranteed-Rate Request" demonstrates how to request a guaranteed rate of I/O transfer.
"Frame Scheduler Examples" describes the sample programs distributed with the REACT/Pro Frame Scheduler.