X-Git-Url: https://git.ralfj.de/rust-101.git/blobdiff_plain/ab942598491747509a9586bf3c0c1c65785b9dd3..ab7f9b241429bd675b437d2437799de75d2f409b:/workspace/src/part15.rs

diff --git a/workspace/src/part15.rs b/workspace/src/part15.rs
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-// Rust-101, Part 15: Mutex, Interior Mutability (cont.), RwLock, Sync
-// ===================================================================
-
-use std::sync::{Arc, Mutex};
-use std::thread;
-use std::time::Duration;
-
-
-// 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!()
-    }
-
-    // The core operation is, of course, `increment`.
-    pub fn increment(&self, by: usize) {
-        // `lock` on a mutex returns a guard, very much like `RefCell`. The guard gives 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(Duration::from_millis(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(Duration::from_millis(20));
-            counter2.increment(3);
-        }
-    });
-
-    // Now we watch the threads working on the counter.
-    for _ in 0..50 {
-        thread::sleep(Duration::from_millis(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 15.1**: Add an operation `compare_and_inc(&self, test: usize, by: usize)` that increments the counter by
-// `by` *only if* the current value is `test`.
-// 
-// **Exercise 15.2**: Rather than panicking in case the lock is poisoned, we can use `into_innter` on the error to recover
-// the data inside the lock. Change the code above to do that. Try using `unwrap_or_else` for this job.
-
-
-// **Exercise 15.3**:  Change the code above to use `RwLock`, such that multiple calls to `get` can be executed at the same time.
-
-