CS520
Spring 2018
Laboratory 10
Friday April 13
The lab must be submitted prior to 12noon on Sunday April 15.

Test your implementation of a concurrent buffer with multiple "producer" and multiple "consumer" threads.

For your testing, use the main program available on agate in ~cs520/public/lab10/countChars2.c. There is also a Makefile in this directory that shows how to compile this program with your code for the concurrent buffer facility.

Use the valgrind memcheck facility to validate that you properly free all allocated memory blocks:

• valgrind --leak-check=yes countChars.

Also run the program using the valgrind helgrind facility to check for threading errors:

• valgrind --tool=helgrind countChars.

Points will be awarded in the following manner:

• 30 points for a program that seems to consistently produce the correct results with a single "producer" and a single "consumer".

• 30 points for a program that seems to consistently produce the correct results with multiple "producer" and multiple "consumer" threads.

• 20 additional points if the program runs without any helgrind errors.

• 20 additional points if valgrind does not find any memory leaks in the program.

Turn in this laboratory by typing:

% ~cs520/bin/submit lab10 concurrentBuffer.c

Submissions can be checked by typing:

% ~cs520/bin/scheck lab10

Remember that there are no late submissions of labs. Submit what you have prior to 12noon on Sunday April 15. Be careful: one minute late is late.

Comments and questions should be directed to pjh@cs.unh.edu