added concurrency tutorial

Author: shalomabitan

philosophers/Cargo.lock

@@ -0,0 +1,4 @@
+[package]
+name = "philosophers"
+version = "0.1.0"
+authors = ["Joel Abitan <[email protected]>"]

philosophers/Cargo.toml

@@ -0,0 +1,69 @@
+use std::thread;
+use std::sync::{Mutex, Arc};
+
+struct Table {
+	forks: Vec<Mutex<()>>,
+}
+
+struct Philosopher {
+	name: String,
+	left: usize,
+	right: usize,
+}
+
+impl Philosopher {
+	fn new(name: &str, left: usize, right: usize) -> Philosopher {
+		Philosopher {
+			name: name.to_string(),
+			left: left,
+			right: right,
+		}
+	}
+	
+	fn eat(&self, table: &Table) {
+
+		let _left = table.forks[self.left].lock().unwrap();
+
+		thread::sleep_ms(150);
+
+		let _right = table.forks[self.right].lock().unwrap();
+
+		println!("{} is eating.", self.name);
+		
+		thread::sleep_ms(1000);
+		
+		println!("{} is done eating.", self.name );
+	}
+}
+
+fn main() {
+	
+	let table = Arc::new(Table { forks: vec![
+		Mutex::new(()),
+		Mutex::new(()),
+		Mutex::new(()),
+		Mutex::new(()),
+		Mutex::new(()),
+	]});
+	
+	let philosophers = vec![
+		Philosopher::new("Judith Butler", 0, 1),
+		Philosopher::new("Gilles Deleuze", 1, 2),
+		Philosopher::new("Karl Max", 2, 3),
+		Philosopher::new("Emma Goldman", 3, 4),
+		Philosopher::new("Michel Foucault",0 ,4),
+	];
+
+	let handles: Vec<_> = philosophers.into_iter().map(|p| {
+
+		let table = table.clone();		
+	
+		thread::spawn(move || {
+			p.eat(&table);
+		})
+	}).collect();
+
+	for h in handles {
+		h.join().unwrap();
+	}
+}