Convert send/recv to blocking, add nonblocking send_nowait/recv_nowait

cocotbext/eth/xgmii.py

@@ -163,7 +163,10 @@ class XgmiiSource(object):
 
         cocotb.fork(self._run())
 
-    def send(self, frame):
+    async def send(self, frame):
+        self.send_nowait(frame)
+
+    def send_nowait(self, frame):
         frame = XgmiiFrame(frame)
         self.queue_occupancy_bytes += len(frame)
         self.queue_occupancy_frames += 1
@@ -305,7 +308,13 @@ class XgmiiSink(object):
 
         cocotb.fork(self._run())
 
-    def recv(self):
+    async def recv(self, compact=True):
+        while self.empty():
+            self.sync.clear()
+            await self.sync.wait()
+        return self.recv_nowait(compact)
+
+    def recv_nowait(self, compact=True):
         if self.queue:
             frame = self.queue.popleft()
             self.queue_occupancy_bytes -= len(frame)