Chapter 23: Timers and Sleeping

Exercise 23-1

To run my solution, type:

make test_1

The sample output is:

Alarm signal received!
Alarm succeeded

Exercise 23-2

The published solution to Exercise 23-2 uses clock_nanosleep() instead of nanosleep().

To run my solution along with the published solution, type:

make test_2

The sample output is:

./Ex_23_2.sh
Using t_nanosleep...
Remaining:  0.000715167
Slept for: 62.077613 secs
Sleep complete
Using Ex_23_2...
Remaining: 9437184.000000012
Slept for: 60.000036 secs
Sleep complete
Using t_clock_nanosleep...
Interrupted... Slept: 62.072626 secs... Remaining: 0.002018094... Restarting
Slept: 62.074727 secs
Sleep complete

There is no meaningful difference between the two (2) versions: t_nanosleep; and t_clock_nanosleep. Both of them overran the set interval by about two (2) seconds.

My solution was close to the set interval.

Exercise 23-3

To run the test, use the following command:

make test_3

The sample output is:

gcc -o Ex_23_3 Ex_23_3.c 
./Ex_23_3
Signal 14 caught
Signal caught
./Ex_23_3 EVP
Signal 14 caught
Signal caught