Add thread locals example to make sure they work

ctru-rs/examples/thread_locals.rs

@@ -0,0 +1,66 @@
+use ctru::console::Console;
+use ctru::services::hid::KeyPad;
+use ctru::services::{Apt, Hid};
+use ctru::Gfx;
+use std::cell::RefCell;
+
+std::thread_local! {
+    static MY_LOCAL: RefCell<&'static str> = RefCell::new("initial value");
+}
+
+fn main() {
+    ctru::init();
+    let gfx = Gfx::default();
+    gfx.top_screen.borrow_mut().set_wide_mode(true);
+    let hid = Hid::init().expect("Couldn't obtain HID controller");
+    let apt = Apt::init().expect("Couldn't obtain APT controller");
+    let _console = Console::init(gfx.top_screen.borrow_mut());
+
+    // Give ourselves up to 30% of the system core's time
+    apt.set_app_cpu_time_limit(30)
+        .expect("Failed to enable system core");
+
+    MY_LOCAL.with(|local| {
+        println!("Initial value on main thread: {}", local.borrow());
+        *local.borrow_mut() = "second value";
+    });
+    MY_LOCAL.with(|local| {
+        println!("Value on main thread after mutation: {}", local.borrow());
+    });
+
+    ctru::thread::Builder::new()
+        .affinity(1)
+        .spawn(move || {
+            MY_LOCAL.with(|local| {
+                println!("Initial value on second thread: {}", local.borrow());
+                *local.borrow_mut() = "third value";
+            });
+            MY_LOCAL.with(|local| {
+                println!("Value on second thread after mutation: {}", local.borrow());
+            });
+        })
+        .expect("Failed to create thread")
+        .join()
+        .expect("Failed to join on thread");
+
+    MY_LOCAL.with(|local| {
+        println!(
+            "Value on main thread after second thread exits: {}",
+            local.borrow()
+        );
+    });
+
+    println!("Press Start to exit");
+
+    while apt.main_loop() {
+        hid.scan_input();
+
+        if hid.keys_down().contains(KeyPad::KEY_START) {
+            break;
+        }
+
+        gfx.flush_buffers();
+        gfx.swap_buffers();
+        gfx.wait_for_vblank();
+    }
+}