Description
Assignment (50 points). For this assignment you will create a group of threads
and then try to coax them into producing as many race conditions as possible.
First, your program should declare a single shared integer variable (i.e. a global
variable) with initial value zero; then your program should spawn off 10 threads,
each of which increments the shared variable by 10, waits for all the threads to
complete and then prints out the final value of the global counter. If all threads
execute sequentially, then (obviously) the final value of the counter should be 100.
Each thread should initially fprintf out to stderr a ‘hello I’m thread #x’ message,
where x is a unique thread id. Then copy the value of the global counter into a local
thread variable, fprintf the value of the local thread variable (along with the thread
ID number), increment the local thread variable by 10, fprintf the new value of the
thread local variable (along with the thread ID number), and finally copy the new
thread local value back to the global counter. Since these threads are
unsynchronized, there is a possibility of race conditions occurring, depending on the
actual interleaved execution order of the various threads. Insert nanosleep()
commands into your thread code to induce as many race conditions as possible
by forcing an (in)appropriate interleaved execution sequence. That is, the final
value of the global counter printed out by main after the threads complete should be
as far away from 100 as possible! As your program executes, it will produce a trace
of output from each thread showing the actual interleaved order of execution –
annotate this output clearly and completely to explain exactly how and where the
race conditions are occurring during execution. Implement your solution using
Pthreads on Linux
What to submit:
1. Please copy-n-paste program output and annotate this output as describe
above.
2. Please fill in readme.txt file given.
3. Push all completed code to your given repository by the deadline.
How to submit:
• To submit your work please do the following:
o git add .
o git commit -m “message”
o git push
