***Please write this in C language.***

There are other solutions to this problem available on chegg, but they are in Python and Java. Please keep it as simple as possible. I can post the exercises referenced if needed. Thanks!

5.36 Programming Exercise 3.20 required you to design a PID manager that allocated a unique process identifier to each process. Exercise 4.20 required you to modify your solution to Exercise 3.20 by writing a program that created a number of threads that requested and released process identifiers. Now modify your solution to Exercise 4.20 by 100 ensuring that the data structure used to represent the availability of process identifiers is safe from race conditions. Use Pthreads mutex locks, described in Section 5.9.4. P