vapi: add vapi_stop_rx_thread()

Type: improvement

Allow vapi to signal to an application's RX thread that it should wake
up and exit.

Before disconnecting from VPP's API, libvlibmemoryclient inserts an
rx_thread_exit message into the client's own input queue to cause its
RX thread to wake up from its blocking dequeue and exit cleanly. Add a
function to vapi's API which will allow libvapi client applications
which have an RX thread waiting for incoming messages using vapi_wait()
to do the same thing.

The existing libvlibmemoryclient code which does this was moved to a
separate function and made available for vapi_stop_rx_thread() to call.

Also fixed some inconsistencies in indentation of function prototypes in
vapi.h to make checkstyle.sh happy.

Signed-off-by: Matthew Smith <mgsmith@netgate.com>
Change-Id: I7bbb73470807123cc63ef313cfb91d1fd31b34e5
diff --git a/src/vpp-api/vapi/vapi.c b/src/vpp-api/vapi/vapi.c
index 3bf56cf..7700eb0 100644
--- a/src/vpp-api/vapi/vapi.c
+++ b/src/vpp-api/vapi/vapi.c
@@ -1420,6 +1420,16 @@
   return __vapi_metadata.msgs[id]->name;
 }
 
+void
+vapi_stop_rx_thread (vapi_ctx_t ctx)
+{
+  if (!ctx || !ctx->connected || !ctx->vl_input_queue)
+    {
+      return;
+    }
+
+  vl_client_stop_rx_thread (ctx->vl_input_queue);
+}
 /*
  * fd.io coding-style-patch-verification: ON
  *