X-Git-Url: https://piware.de/gitweb/?p=learn-rust.git;a=blobdiff_plain;f=concepts%2Fsrc%2Fmain.rs;fp=concepts%2Fsrc%2Fmain.rs;h=94bdb960aa7e79b80d4ad22f082ab2822e6c1fbc;hp=65fb785c838a2a966e6c1d4c5494f4751d5f0b0d;hb=89ba5f70f2de2cf038b2abb701a3d257c6b965d8;hpb=cf171920f1d9768f922556b13042e3a3465483f3

diff --git a/concepts/src/main.rs b/concepts/src/main.rs
index 65fb785..94bdb96 100644
--- a/concepts/src/main.rs
+++ b/concepts/src/main.rs
@@ -205,6 +205,7 @@ fn test_threads() {
 
     t1.join().unwrap();
 
+    // message passing
     let (tx1, rx) = sync::mpsc::channel();
     let tx2 = tx1.clone();
 
@@ -228,6 +229,22 @@ fn test_threads() {
 
     sender1.join().unwrap();
     sender2.join().unwrap();
+
+    // shared state
+    let counter = sync::Arc::new(sync::Mutex::new(0));
+    let mut threads = vec![];
+    for _ in 0..10 {
+        let tc = sync::Arc::clone(&counter);
+        threads.push(thread::spawn(move || {
+            *tc.lock().unwrap() += 1;
+        }));
+    }
+
+    for t in threads {
+        t.join().unwrap();
+    }
+
+    println!("counter: {}", *counter.lock().unwrap());
 }
 
 fn main() {