In c program | Computer Science homework help

Write a solution for the producer/consumer problem using processes instead of threads. Refer to the solution worked out in the demo and make sure you fully understand what is going on there before beginning this one (source file is attached to this assignment). Turn in all code and a text file called README containing instructions for building and running your programs. All programs must compile and run on Descriptions of functions listed below in bold can be found in the man pages (e.g. man fork), though sometimes you may need to specify the correct section of the manual to get the correct page (e.g. man 3 printf). Approach the homework in phases and incrementally grow your solution: start with process creation (e.g. if there’s one producer and one consumer specified, one process -the parent- will fork two others, a producer program and a consumer program), then move on to shared memory stuff (making sure that the children can read what the parent is placing in there), and only then finish up the producer/consumer portion (pretty much the same as the threaded version).

Use the following functions for process creation, etc:

fork – create a new process

execlp – replace current process image with a new process image (i.e. execute a file)

waitpid – allows parent to wait for a child with specified pid

Use the following functions for sharing stuff between processes:

shm_open – create a named chunk of shared memory

ftruncate – to change the size of the named chunk of shared memory

mmap – to map the shared memory chunk into current process’ address space


Let’s say you want to share a struct, like:

typedef struct shared{

   int some_int_to_share;

   int some_other_int_to_share;



In the parent process (the one that starts everything):

int fd = shm_open(“prodconshare”, O_CREAT | O_RDWR, S_IRUSR | S_IWUSR);

ftruncate(fd, sizeof(shared));

shared* sharedstruct = mmap(NULL, sizeof(shared), PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);

In the child process it is similar, but the child process would not create the named chunk if it doesn’t exist and the child process has no need to resize the chunk (so, no ftruncate):

int fd = shm_open(“prodconshare”, O_RDWR, S_IRUSR | S_IWUSR);

shared* sharedstruct = mmap(NULL, sizeof(shared), PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);

Use the following functions to synchronize the producers and consumers:

sem_init – initialize a semaphore

sem_wait – decrement a semaphore

sem_post – increment a semaphore

(remember that decrementing a semaphore below zero will put the calling process to sleep and sem_post will have to be called by another process to wake it up. You might think about stuffing some semaphores into the shared memory, using a struct to arrange the shared memory chunk’s contents.)

The producers can exit when they’ve produced their whole string, e.g. “hello world”.

For simplicity, the consumers may run indefinitely and be terminated with ctrl+c.

Other useful functions:

malloc – allocate memory

sizeof – get the size of things

printf – print stuff

perror – print error stuff

Calculate your paper price
Pages (550 words)
Approximate price: -

Why Choose Us

Quality Papers

We value our clients. For this reason, we ensure that each paper is written carefully as per the instructions provided by the client. Our editing team also checks all the papers to ensure that they have been completed as per the expectations.

Professional Academic Writers

Over the years, our Acme Homework has managed to secure the most qualified, reliable and experienced team of writers. The company has also ensured continued training and development of the team members to ensure that it keep up with the rising Academic Trends.

Affordable Prices

Our prices are fairly priced in such a way that ensures affordability. Additionally, you can get a free price quotation by clicking on the "Place Order" button.

On-Time delivery

We pay strict attention on deadlines. For this reason, we ensure that all papers are submitted earlier, even before the deadline indicated by the customer. For this reason, the client can go through the work and review everything.

100% Originality

At Buy An Essay, all papers are plagiarism-free as they are written from scratch. We have taken strict measures to ensure that there is no similarity on all papers and that citations are included as per the standards set.

Customer Support 24/7

Our support team is readily available to provide any guidance/help on our platform at any time of the day/night. Feel free to contact us via the Chat window or support email:

Try it now!

Calculate the price of your order

We'll send you the first draft for approval by at
Total price:

How it works?

Follow these simple steps to get your paper done

Place your order

Fill in the order form and provide all details of your assignment.

Proceed with the payment

Choose the payment system that suits you most.

Receive the final file

Once your paper is ready, we will email it to you.

Our Services

Buy An Essay has stood as the world’s leading custom essay writing services providers. Once you enter all the details in the order form under the place order button, the rest is up to us.


Essay Writing Services

At Buy An Essay, we prioritize on all aspects that bring about a good grade such as impeccable grammar, proper structure, zero-plagiarism and conformance to guidelines. Our experienced team of writers will help you completed your essays and other assignments.


Admission and Business Papers

Be assured that you’ll definitely get accepted to the Master’s level program at any university once you enter all the details in the order form. We won’t leave you here; we will also help you secure a good position in your aspired workplace by creating an outstanding resume or portfolio once you place an order.


Editing and Proofreading

Our skilled editing and writing team will help you restructure you paper, paraphrase, correct grammar and replace plagiarized sections on your paper just on time. The service is geared toward eliminating any mistakes and rather enhancing better quality.


Technical papers

We have writers in almost all fields including the most technical fields. You don’t have to worry about the complexity of your paper. Simply enter as much details as possible in the place order section.