[Fix] impl Drop for FiberFuture

Signed-off-by: csh <[email protected]>

crates/wasmedge-sys/src/async/fiber.rs

@@ -57,6 +57,14 @@ impl<'a> FiberFuture<'a> {
 
         Ok(slot.unwrap())
     }
+
+    fn resume(&mut self, val: Result<(), ()>) -> Result<Result<(), ()>, ()> {
+        let async_cx = AsyncCx {
+            current_suspend: self.current_suspend,
+            current_poll_cx: self.current_poll_cx,
+        };
+        ASYNC_CX.set(&async_cx, || self.fiber.resume(val))
+    }
 }
 impl<'a> Future for FiberFuture<'a> {
     type Output = Result<(), ()>;
@@ -79,6 +87,19 @@ impl<'a> Future for FiberFuture<'a> {
 }
 unsafe impl Send for FiberFuture<'_> {}
 
+impl Drop for FiberFuture<'_> {
+    fn drop(&mut self) {
+        if !self.fiber.done() {
+            let result = self.resume(Err(()));
+            // This resumption with an error should always complete the
+            // fiber. While it's technically possible for host code to catch
+            // the trap and re-resume, we'd ideally like to signal that to
+            // callers that they shouldn't be doing that.
+            debug_assert!(result.is_ok());
+        }
+    }
+}
+
 type FiberSuspend = Suspend<Result<(), ()>, (), Result<(), ()>>;
 
 scoped_tls::scoped_thread_local!(static ASYNC_CX: AsyncCx);

crates/wasmedge-sys/src/async/function.rs

@@ -208,7 +208,7 @@ extern "C" fn wrap_async_wasi_fn<T: 'static>(
     let result = match unsafe { async_cx.block_on(future.as_mut()) } {
         Ok(Ok(ret)) => Ok(ret),
         Ok(Err(err)) => Err(err),
-        Err(_err) => Err(HostFuncError::User(0x87)),
+        Err(_err) => Err(HostFuncError::Runtime(0x07)),
     };
 
     // parse result

crates/wasmedge-sys/src/instance/function.rs

@@ -134,7 +134,7 @@ extern "C" fn wrap_async_fn(
             let result = match unsafe { async_cx.block_on(future.as_mut()) } {
                 Ok(Ok(ret)) => Ok(ret),
                 Ok(Err(err)) => Err(err),
-                Err(_err) => Err(HostFuncError::User(0x87)),
+                Err(_err) => Err(HostFuncError::Runtime(0x07)),
             };
 
             // parse result