X-Git-Url: https://git.ralfj.de/rust-101.git/blobdiff_plain/0223210576f27d0743c2d12b890d30f5c2ef6b2d..ab7f9b241429bd675b437d2437799de75d2f409b:/workspace/src/part14.rs

diff --git a/workspace/src/part14.rs b/workspace/src/part14.rs
deleted file mode 100644
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--- a/workspace/src/part14.rs
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@@ -1,72 +0,0 @@
-// Rust-101, Part 14: Mutex, Interior Mutability, Sync
-// ===================================================
-
-use std::sync::{Arc, Mutex};
-use std::thread;
-
-
-// The derived `Clone` implementation will clone the `Arc`, so all clones will actually talk about the same counter.
-#[derive(Clone)]
-struct ConcurrentCounter(Arc<Mutex<usize>>);
-
-impl ConcurrentCounter {
-    // The constructor just wraps the constructors of `Arc` and `Mutex`.
-    pub fn new(val: usize) -> Self {
-        unimplemented!()
-    }
-
-    pub fn increment(&self, by: usize) {
-        // `lock` on a mutex returns a *guard*, giving access to the data contained in the mutex.
-        let mut counter = self.0.lock().unwrap();
-        *counter = *counter + by;
-    }
-
-    // The function `get` returns the current value of the counter.
-    pub fn get(&self) -> usize {
-        unimplemented!()
-    }
-}
-
-// Now our counter is ready for action.
-pub fn main() {
-    let counter = ConcurrentCounter::new(0);
-
-    // We clone the counter for the first thread, which increments it by 2 every 15ms.
-    let counter1 = counter.clone();
-    let handle1 = thread::spawn(move || {
-        for _ in 0..10 {
-            thread::sleep_ms(15);
-            counter1.increment(2);
-        }
-    });
-
-    // The second thread increments the counter by 3 every 20ms.
-    let counter2 = counter.clone();
-    let handle2 = thread::spawn(move || {
-        for _ in 0..10 {
-            thread::sleep_ms(20);
-            counter2.increment(3);
-        }
-    });
-
-    // Now we watch the threads working on the counter.
-    for _ in 0..50 {
-        thread::sleep_ms(5);
-        println!("Current value: {}", counter.get());
-    }
-
-    // Finally, we wait for all the threads to finish to be sure we can catch the counter's final value.
-    handle1.join().unwrap();
-    handle2.join().unwrap();
-    println!("Final value: {}", counter.get());
-}
-
-// **Exercise 14.1**: Besides `Mutex`, there's also [`RwLock`](http://doc.rust-lang.org/stable/std/sync/struct.RwLock.html), which
-// provides two ways of locking: One that grants only read-only access, to any number of concurrent readers, and another one
-// for exclusive write access. (Notice that this is the same pattern we already saw with shared vs. mutable borrows.) Change
-// the code above to use `RwLock`, such that multiple calls to `get` can be executed at the same time.
-// 
-// **Exercise 14.2**: Add an operation `compare_and_inc(&self, test: usize, by: usize)` that increments the counter by
-// `by` *only if* the current value is `test`.
-
-