Description
The given bank.c program has 3 processes namely, the dad process and two son processes. The critical section (CS) in the given problem is a son withdrawing money from the bank and the dad depositing money
in the bank, at randomly selected time intervals. The program in the given form has synchronization
errors, i.e., these 3 processes get into a race condition when accessing the shared bank_balance variable.
The program itself compiles correctly (i.e., there are no syntax errors).
In Step 1, you need to run the program and analyze the execution traces, whereupon you have to identify
the synchronization errors. After identifying the synchronization errors, you need to insert the “P(sem)”
and “V(sem)” operations at right places in the code that fix the synchronization errors.
In Step 2, you work on a measurement component. A mutex algorithm is associated with a “bounded
wait” property, i.e., how long a process P is forced to wait for entry into a CS after P has expressed interest
in the CS. Lets call the wait time as T(P), where T(P) is the number of times processes other than P enter
the CS after P expresses interest in the CS but before P actually enters the CS. You need to compute T(P)
for all three processes in the problem and display it at the end of “N” different attempts. Measure T(P) for
at least 5 different N’s and include the values in your report.
Instructions
• You need to have sem.h header file in your present working directory to run this program and invoke
semaphore operations.
• The bank.c file is documented. Once you are done with your solution, insert comments at the places
where you made changes to fix the synchronization errors and add the wait time measurement.
• This synchronization problem should be solved with as few semaphore variables as possible.
Submission Instructions
Submit the bank.c file with semaphore operations inserted at appropriate places and measurement component. Write a brief report (at most 1 page) on how your solution prevents race condition between the
dad and son processes and measure the wait time of each process. Zip both the files into a single folder
as: task5_lastname.zip. Email your zip file with the subject line, “Task 5 – CSc 332 (6X) – lastname”.
***
1
