destruction problem

examples/lockall_destruct.rs

@@ -0,0 +1,60 @@
+//! examples/lockall.rs
+
+#![deny(unsafe_code)]
+#![deny(warnings)]
+#![no_main]
+#![no_std]
+
+use panic_semihosting as _;
+
+#[rtic::app(device = lm3s6965, dispatchers = [GPIOA, GPIOB, GPIOC])]
+mod app {
+    use cortex_m_semihosting::{debug, hprintln};
+
+    #[shared]
+    struct Shared {
+        a: u32,
+        b: i64,
+    }
+
+    #[local]
+    struct Local {}
+
+    #[init]
+    fn init(_: init::Context) -> (Shared, Local, init::Monotonics) {
+        foo::spawn().unwrap();
+
+        (Shared { a: 1, b: 2 }, Local {}, init::Monotonics())
+    }
+
+    // when omitted priority is assumed to be `1`
+    #[task(shared = [a, b])]
+    fn foo(mut c: foo::Context) {
+        c.shared.lock(|Shared { a, b }| {
+            hprintln!("foo: a = {}, b = {}", a, b).ok();
+            *a += 1;
+            bar::spawn().unwrap();
+            baz::spawn().unwrap();
+            hprintln!("still in foo::lock").ok();
+        });
+        hprintln!("still in foo").ok();
+        debug::exit(debug::EXIT_SUCCESS); // Exit QEMU simulator
+    }
+
+    #[task(priority = 2, shared = [a])]
+    fn bar(mut c: bar::Context) {
+        // the higher priority task does still need a critical section
+        let a = c.shared.lock(|s| {
+            *s.a += 1;
+            // *s.b += 1; `b` not accessible
+            *s.a
+        });
+
+        hprintln!("bar: a = {}", a).unwrap();
+    }
+
+    #[task(priority = 3)]
+    fn baz(_: baz::Context) {
+        hprintln!("baz").unwrap();
+    }
+}