rlinsdev / 42-philosophers-aux

Philosophers

42 Project Aux tests and definitions

Definitions

• Data Races: Occur when multiple tasks or threads access a shared resource without sufficient protections
• Mutex: MUTual EXclusion - Protect the execution again other threads running at the same time.
• Semaphore: Some kind of mutex, but with counter

External functions.

function	Description
memset	ToDo
printf	ToDo
malloc	ToDo
free	ToDo
write	ToDo
usleep	ToDo
gettimeofday	sys/time.h - get / set time
pthread_create	pthread.h - Thread creation
pthread_detach	pthread.h - When a detached thread terminates, its resources are automatically released back to the system
pthread_join	pthread.h - function waits for the thread specified by thread to terminate
pthread_mutex_init	pthread.h - destroy and initialize a mutex
pthread_mutex_destroy	pthread.h - destroy and initialize a mutex
pthread_mutex_lock	pthread.h - lock and unlock a mutex
pthread_mutex_unlock	pthread.h - lock and unlock a mutex

Commands:

#Generate code in machine language
$ gcc -S main.c
$ ./philo 5	86400000 3600000 28800000 2

To Test:

• Valgrind with race condition

Links

Code Vault - Playlist

What are Race conditions?

Mutex in C?

Deadlock C?

Semaphores?

Dining philosophers problem

Dining philosophers problem 2

Dining philosophers problem 3

Dining philosophers problem 4