support app framework base library in assemblyscript (#164)

assembly-script/samples/timer.ts

@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+// The entry file of your WebAssembly module.
+import * as console from '../wamr_app_lib/console'
+import * as timer from '../wamr_app_lib/timer'
+
+/* clousure is not implemented yet, we need to declare global variables
+    so that they can be accessed inside a callback function */
+var cnt = 0;
+var my_timer: timer.user_timer;
+
+export function on_init(): void {
+    /* The callback function will be called every 2 second,
+        and will stop after 10 calls */
+    my_timer = timer.setInterval(() => {
+        cnt ++;
+        console.log((cnt * 2).toString() + " seconds passed");
+
+        if (cnt >= 10) {
+            timer.timer_cancel(my_timer);
+            console.log("Stop Timer");
+        }
+    }, 2000);
+}
+
+export function on_destroy(): void {
+
+}
+
+/* Function below are requred by wamr runtime, don't remove or modify them */
+export function _on_timer_callback(on_timer_id: i32): void {
+    timer.on_timer_callback(on_timer_id);
+}