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Philosophers

Dining philosophers problem

The aim of this project is to learn the basics of threading a process and get familiar with shared memory, threads, mutex, semaphore.

Rules

  • A number of philosophers are sitting at a round table doing one of three things: eating, thinking or sleeping.
  • While eating, they are not thinking or sleeping, while sleeping, they are not eating or thinking and of course, while thinking, they are not eating or sleeping.
  • The philosophers sit at a circular table with a large bowl of spaghetti in the center.
  • There are some forks on the table.
  • As spaghetti is difficult to serve and eat with a single fork, it is assumed that a philosopher must eat with two forks, one for each hand.
  • The philosophers must never be starving.
  • Every philosopher needs to eat.
  • Philosophers don’t speak with each other.
  • Philosophers don’t know when another philosopher is about to die.
  • Each time a philosopher has finished eating, he will drop his forks and start sleeping.
  • When a philosopher is done sleeping, he will start thinking.
  • The simulation stops when a philosopher dies.
  • Philosophers should avoid to die!

Each program completes the task using different methods:

Build

git clone https://github.com/FrenkenFlores/Philosophers
cd Philosophers
make

Instructions

cd philo_one/
./philo_one number_of_philosophers time_to_die time_to_eat time_to_sleep [number_of_times_each_philosopher_must_eat]
  • number_of_philosophers: is the number of philosophers and also the number of forks
  • time_to_die: is in milliseconds, if a philosopher doesn’t start eating ’time_to_die’ milliseconds after starting his last meal or the beginning of the simulation, it dies
  • time_to_eat: is in milliseconds and is the time it takes for a philosopher to eat. During that time he will need to keep the two forks.
  • time_to_sleep: is in milliseconds and is the time the philosopher will spend sleeping.
  • number_of_times_each_philosopher_must_eat: argument is optional, if all philosophers eat at least ’number_of_times_each_philosopher_must_eat’ the simulation will stop. If not specified, the simulation will stop only at the death of a philosopher.

Demonstration

philo render

Resources