The following PThreads code is written for book reservation in a library. Each student checks if the book is free. If it was free they will reserve it with their own ID and the book becomes unavailable to the rest.

a. Can you identify the problem with this code? Explain the condition that the code may fail.

b. Rewrite the code (just a few lines of code) to solve the problem.

//PThreads code here

if (book.state==free)

{ book.state=reserved;

book.borrower=MyID;

}