47 lines
1.7 KiB
Markdown
47 lines
1.7 KiB
Markdown
options :
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```
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- n_phi -> number_of_philosophers
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- t_die -> time_to_die
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- t_eat -> time_to_eat
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- t_slp -> time_to_sleep
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- n_est -> [number_of_times_each_philosopher_must_eat]
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```
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thread :
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- thread are light-weight-process (LWP) that happens inside a process
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- a process can be single-threaded or multi-threaded
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- different process have a unique PID with a unique LWP, different thread in the same process have the same PID and a different LWP
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- thread vs process :
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process :
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- process is isolated, it doesn't share memory with any other process
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- process can have states : new, ready, running, waiting, terminated, suspended
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- process is less efficient in communication, it takes more times to create or terminate or switch
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- process speed is not impacted by speed of other process (untill it reach the limit of cpu)
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- process are created with fork() and execve() (to duplicate a process in a child process, or replacing an existing process)
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thread :
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- thread are not isolated
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- thread can have states : running, ready, blocked
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- thread is more efficient in communication, it takes less times to create or terminate or switch
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- thread can become slow if the process does many concurrent tasks
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- ressources :
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- https://www.baeldung.com/linux/process-vs-thread
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external function :
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- `memset` : fill memory with a constant byte
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- `printf` : format and print data
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- `malloc` : allocate dynamic memory
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- `free` : free dynamic memory
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- `write` : write to a file descriptor
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- `usleep` : suspend execution for microseconds intervals
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- `gettimeofday` : get time
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- `pthread_create` : create a new thread
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- `pthread_detach` :
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- `pthread_join`
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- `pthread_mutex_init`
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- `pthread_mutex_destroy`
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- `pthread_mutex_lock`
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- `pthread_mutex_unlock`
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