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-options :
-```
-- n_phi -> number_of_philosophers
-- t_die -> time_to_die
-- t_eat -> time_to_eat
-- t_slp -> time_to_sleep
-- n_eat -> [number_of_times_each_philosopher_must_eat]
-```
-
-**thread :**
-
-- parts of a process that performs code simultaneously
-- thread are light-weight-process (LWP) that happens inside a process (observe with command `ps -eLf`)
-- a process can be single-threaded or multi-threaded
-- different process have a different PID and different LWP, different thread in the same process have the same PID and different LWP
-- thread vs process :
-
-  *process :*
-
-  - process is isolated, it doesn't share memory with any other process
-  - process is less efficient in communication, it takes more times to create or terminate or switch
-  - process speed is not impacted by speed of other process (untill it reach the limit of cpu)
-
-  *thread :*
-
-  - thread are not isolated, they share memory with the other threads
-  - thread is more efficient in communication, it takes less times to create or terminate or switch
-  - thread can become slow if the process does many concurrent tasks
-
-- ressources :
-  - https://www.baeldung.com/linux/process-vs-thread
-
-**mutex :**
-
-- mutual exclusion
-- to prevent a part of the code to be performed simultaneously by threads
-- the section of code wraped by a mutex can be access by only one thread at a time
-- the section starts by unlocking a mutex, and end by locking it
-
-**external function :**
-
-- `memset`      : fill memory with a constant byte
-- `printf`      : format and print data
-- `malloc`      : allocate dynamic memory
-- `free`        : free dynamic memory
-- `write`       : write to a file descriptor
-- `usleep`      : suspend execution for microseconds intervals
-- `gettimeofday`: get time
-- `pthread_create`       : create a new thread
-- `pthread_join`         : wait for a thread to finish, 
-- `pthread_detach`       : when a thread is detached it cannot be join, you cannot wait for it to teminate, it will release its ressources on its own when it has finish
-- `pthread_mutex_init`   : initialize a mutex
-- `pthread_mutex_destroy`: destroy a mutex
-- `pthread_mutex_unlock` : unlock a mutex
-- `pthread_mutex_lock`   : lock a mutex
-
diff --git a/philosopher.pdf b/philosopher.pdf
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Binary files a/philosopher.pdf and /dev/null differ