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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);
5
6 b->data[b->tail] = item;
7 b->tail = (b->tail + 1) % CAP;
8 b->count++;
9
10 pthread_cond_signal(&b->not_empty); /* wake one consumer */
11 pthread_mutex_unlock(&b->lock);
12}
13
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
1.
while, not if
A woken thread re-checks the condition, because another thread may have taken the slot first.
2.
Two condition variables
Producers wait on not_full and consumers on not_empty, so nobody is woken for nothing.
3.
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
Shown before any contact details were shared.
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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