Merge #97

97: v0.4.0 r=japaric a=japaric

closes #32
closes #33

Co-authored-by: Jorge Aparicio <jorge@japaric.io>

1 files changed, 61 insertions, 0 deletions

diff --git a/examples/task.rs b/examples/task.rs
new file mode 100644
index 0000000..b1cd7ae
--- /dev/null
+++ b/examples/task.rs
@@ -0,0 +1,61 @@
+//! examples/task.rs
+
+#![deny(unsafe_code)]
+#![deny(warnings)]
+#![no_main]
+#![no_std]
+
+extern crate panic_semihosting;
+
+use cortex_m_semihosting::debug;
+use rtfm::app;
+
+macro_rules! println {
+    ($($tt:tt)*) => {
+        if let Ok(mut stdout) = cortex_m_semihosting::hio::hstdout() {
+            use core::fmt::Write;
+
+            writeln!(stdout, $($tt)*).ok();
+        }
+    };
+}
+
+#[app(device = lm3s6965)]
+const APP: () = {
+    #[init(spawn = [foo])]
+    fn init() {
+        spawn.foo().unwrap();
+    }
+
+    #[task(spawn = [bar, baz])]
+    fn foo() {
+        println!("foo");
+
+        // spawns `bar` onto the task scheduler
+        // `foo` and `bar` have the same priority so `bar` will not run until
+        // after `foo` terminates
+        spawn.bar().unwrap();
+
+        // spawns `baz` onto the task scheduler
+        // `baz` has higher priority than `foo` so it immediately preempts `foo`
+        spawn.baz().unwrap();
+    }
+
+    #[task]
+    fn bar() {
+        println!("bar");
+
+        debug::exit(debug::EXIT_SUCCESS);
+    }
+
+    #[task(priority = 2)]
+    fn baz() {
+        println!("baz");
+    }
+
+    // Interrupt handlers used to dispatch software tasks
+    extern "C" {
+        fn UART0();
+        fn UART1();
+    }
+};