Merge pull request #6 from JadeCara/jade/data_race

Jade/data race

Author: JadeCara

module2/data_race/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "data_race"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

module2/data_race/Makefile

@@ -0,0 +1,38 @@
+SHELL := /bin/bash
+.PHONY: help
+
+help:
+	@grep -E '^[a-zA-Z0-9_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-20s\033[0m %s\n", $$1, $$2}'
+
+clean: ## Clean the project using cargo
+	cargo clean
+
+build: ## Build the project using cargo
+	cargo build
+
+run: ## Run the project using cargo
+	cargo run
+
+test: ## Run the tests using cargo
+	cargo test
+
+lint: ## Run the linter using cargo
+	@rustup component add clippy 2> /dev/null
+	cargo clippy
+
+format: ## Format the code using cargo
+	@rustup component add rustfmt 2> /dev/null
+	cargo fmt
+
+release:
+	cargo build --release
+
+all: format lint test run
+
+bump: ## Bump the version of the project
+	@echo "Current version is $(shell cargo pkgid | cut -d# -f2)"
+	@read -p "Enter the new version: " version; \
+	updated_version=$$(cargo pkgid | cut -d# -f2 | sed "s/$(shell cargo pkgid | cut -d# -f2)/$$version/"); \
+	sed -i -E "s/^version = .*/version = \"$$updated_version\"/" Cargo.toml
+	@echo "Version bumped to $$(cargo pkgid | cut -d# -f2)"
+	rm Cargo.toml-e

module2/data_race/src/main.rs

@@ -0,0 +1,113 @@
+// Mutex that protects the data vector, and then we spawn three threads
+//that each acquire a lock on the mutex and modify an element of the vector.
+// https://doc.rust-lang.org/std/sync/struct.Mutex.html
+
+use std::sync::{Arc, Condvar, Mutex, RwLock};
+use std::thread;
+
+fn using_mutex() {
+    println!("Mutex Example");
+    let data = Arc::new(Mutex::new(vec![1, 2, 3]));
+
+    let handles: Vec<_> = (0..3)
+        .map(|i| {
+            let data = Arc::clone(&data);
+            thread::spawn(move || {
+                let mut data = data.lock().unwrap();
+                data[i] += 1;
+                println!("{:?}", data);
+            })
+        })
+        .collect();
+
+    for handle in handles {
+        handle.join().unwrap();
+    }
+
+    let data = data.lock().unwrap();
+    println!("Final data: {:?}", *data);
+}
+
+fn using_rwlock() {
+    println!("RwLock Example");
+    // Create an RwLock protecting a vector
+    let data = Arc::new(RwLock::new(vec![1, 2, 3]));
+
+    // Spawn three threads that each acquire a write lock on the RwLock and modify an element of the vector
+    let handles: Vec<_> = (0..3)
+        .map(|i| {
+            let data = Arc::clone(&data);
+            thread::spawn(move || {
+                let mut data = data.write().unwrap();
+                data[i] += 1;
+                println!("Thread {}: {:?}", i, *data);
+            })
+        })
+        .collect();
+
+    // Wait for all threads to finish
+    for handle in handles {
+        handle.join().unwrap();
+    }
+
+    // Acquire a read lock to print the final state of the vector
+    let data = data.read().unwrap();
+
+    println!("Final data: {:?}", *data);
+}
+
+fn using_condvar() {
+    println!("Condvar Example");
+    let data = Arc::new((Mutex::new(vec![1, 2, 3]), Condvar::new()));
+    let mut handles = vec![];
+
+    for i in 0..3 {
+        let data = Arc::clone(&data);
+        let handle = thread::spawn(move || {
+            let (lock, cvar) = &*data;
+            let mut data = lock.lock().unwrap();
+            data[i] += 1;
+            println!("Thread {}: {:?}", i, *data);
+            cvar.notify_one();
+        });
+        handles.push(handle);
+    }
+
+    for handle in handles {
+        handle.join().unwrap();
+    }
+
+    let (lock, cvar) = &*data;
+    let mut data = lock.lock().unwrap();
+    while data.iter().any(|&x| x == 1) {
+        data = cvar.wait(data).unwrap();
+    }
+
+    println!("Final data: {:?}", *data);
+}
+
+fn main() {
+    using_mutex();
+    using_rwlock();
+    using_condvar();
+}
+
+/*
+
+// This code will not compile because the borrow checker will prevent it.
+use std::thread;
+
+fn main() {
+    let mut data = vec![1, 2, 3];
+
+    for i in 0..3 {
+        // Try to capture a mutable reference in multiple threads
+        // This will fail to compile!
+        thread::spawn(move || {
+            data[i] += 1;
+        });
+    }
+
+    // No data race can occur, this will not compile.
+}
+*/