Panoramix

Context

The year is 50 BC. Gaul is entirely occupied by the Romans. Well, not entirely... One small village of
indomitable Gauls still holds out against the invaders. And life is not easy for the Roman legionaries who
garrison the fortified camps of Totorum, Aquarium, Laudanum and Compendium...

In this village the druid prepares a cooking pot of magic potions. The villagers get a serving of potion and
then procede to beat roman soldiers. When the pot is empty, the villager wakes up the druid and waits until the druid has refilled the pot.

Project

The purpose of this project is to study examples of threads and mutex programming and the algorithmic
difficulties that go with it.

Usage

USAGE: ./panoramix <nb_villagers> <pot_size> <nb_fights> <nb_refills>

• nb_villagers: indicates the number of villagers (must be >0);
  
• pot_size: indicates the maximum number that can be contained in the cooking pot (must be >0);
  
• nb_fights: indicates the maximum number of fights a villager will engage in (must be >0);
  
• nb_refills: incicates the maximum number of time the druid will refill the pot (must be >0);
  

Rules

The program must follow these rules:

• You MUST make use of semaphores;
  
• You MUST make use of mutexes;
  
• Each villager (and the druid) MUST run in its own thread;
  
• The cooking pot is full at the start of the program:
  
• A villager’s thread must stop when all the fights have been done (and hopefully won);
  
• The druid’s thread must stop when he has no ingredients left (aka: nb_refills) to refill the pot;
  
• The program must stop gracefully when all the villager’s threads have stopped.
  

Compilation

All compilations are executed using make.

make
make all
make re
make clean
make fclean

Examples

Threads run asynchronously, so the outputs will not always be exactly in the same order
but it must always follow all the rules previously indicated.

> ./panoramix 3 5 3 1
Druid: I’m ready... but sleepy...
Villager 2: Going into battle!
Villager 1: Going into battle!
Villager 0: Going into battle!
Villager 2: I need a drink... I see 5 servings left.
Villager 0: I need a drink... I see 4 servings left.
Villager 0: Take that roman scum! Only 2 left.
Villager 1: I need a drink... I see 3 servings left.
Villager 2: Take that roman scum! Only 2 left.
Villager 1: Take that roman scum! Only 2 left.
Villager 0: I need a drink... I see 2 servings left.
Villager 0: Take that roman scum! Only 1 left.
Villager 2: I need a drink... I see 1 servings left.
Villager 1: I need a drink... I see 0 servings left.
Villager 1: Hey Pano wake up! We need more potion.
Druid: Ah! Yes, yes, I’m awake! Working on it! Beware I can only make 0 more
refills after this one.
Druid: I’m out of viscum. I’m going back to... zZz
Villager 1: Take that roman scum! Only 1 left.
Villager 2: Take that roman scum! Only 1 left.
Villager 0: I need a drink... I see 4 servings left.
Villager 1: I need a drink... I see 3 servings left.
Villager 0: Take that roman scum! Only 0 left.
Villager 2: I need a drink... I see 2 servings left.
Villager 1: Take that roman scum! Only 0 left.
Villager 2: Take that roman scum! Only 0 left.
Villager 0: I’m going to sleep now.
Villager 1: I’m going to sleep now.
Villager 2: I’m going to sleep now.