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Operating systems homework help. Race-free and explained.

Threads, scheduling, memory and file systems in C, including xv6 and Pintos labs. Race-free code with every synchronization choice explained.

Cxv6PintospthreadsgdbQEMU

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What we cover

Every part of operating systems your course covers.

Processes

fork, exec, wait
Scheduling algorithms
Context switching
System calls

Concurrency

Locks and semaphores
Condition variables
Deadlock avoidance
Producer-consumer

Memory

Paging and page tables
Virtual memory
LRU and clock replacement
Allocators

Storage

File systems
Inodes and directories
Journaling
I/O scheduling

Example order

One operating systems order, start to finish.

What the student uploaded, what came back, and how the price was set.

01The brief

Operating SystemsUndergradDue in 5 days

Bounded buffer with condition variables

Implement a thread-safe bounded buffer for multiple producers and consumers using pthread mutexes and condition variables. No busy waiting, no races, no deadlocks.

Requirements

Fixed-capacity circular buffer
Multiple producers and consumers
No busy waiting
Clean under ThreadSanitizer

02The solution

buffer.c24 lines

1void put(buffer_t *b, int item) {

2 pthread_mutex_lock(&b->lock);

3 while (b->count == CAP) /* full: wait, never spin */

4 pthread_cond_wait(&b->not_full, &b->lock);

6 b->data[b->tail] = item;

7 b->tail = (b->tail + 1) % CAP;

8 b->count++;

10 pthread_cond_signal(&b->not_empty); /* wake one consumer */

11 pthread_mutex_unlock(&b->lock);

12}

14int get(buffer_t *b) {

15 pthread_mutex_lock(&b->lock);

16 while (b->count == 0)

17 pthread_cond_wait(&b->not_empty, &b->lock);

18 int item = b->data[b->head];

19 b->head = (b->head + 1) % CAP;

20 b->count--;

21 pthread_cond_signal(&b->not_full);

22 pthread_mutex_unlock(&b->lock);

23 return item;

24}

ThreadSanitizer: 0 races · 4.2M items/s

03The explanation doc

explanation.pdf

while, not if

A woken thread re-checks the condition, because another thread may have taken the slot first.

Two condition variables

Producers wait on not_full and consumers on not_empty, so nobody is woken for nothing.

Testing

8 producers and 8 consumers moved 1,000,000 items with no races reported.

04The price

AI predicted budget

$110–$200

Level · UndergradIncluded

Deadline · 5 daysStandard

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Final price from our team

$150

Delivered 9h early

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Typical orders

Common operating systems assignments and typical budgets.

Scheduling simulator

$100–$220

Usually 3–4 days

typical range

Synchronization problem

$90–$200

Usually 2–4 days

typical range

xv6 or Pintos kernel lab

$200–$450

Usually 5–8 days

typical range

Virtual memory / paging lab

$150–$320

Usually 4–6 days

typical range

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Do you work on xv6 and Pintos?

Yes, inside your repo and QEMU setup, changing only the files the lab allows.

How do you test for races?

We stress-test with many threads and run ThreadSanitizer or Helgrind before delivery.

Will I understand the locking?

Every lock and ordering decision is commented and covered in the explanation doc.

Is the predicted budget the final price?

Not exactly, but it’s capped. Our team reviews your files and sends one fixed price before you pay anything, and it never goes above the top of your range.

What if you miss my deadline?

You get a full refund, back to your card through Stripe. It’s in our refund policy, in writing.

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