linda:send() raises an error when there is no data to send instead of silently doing nothing.v2.2.0

1 files changed, 6 insertions, 0 deletions

diff --git a/src/lanes.c b/src/lanes.c
index e514e6b..ed54b0f 100644
--- a/src/lanes.c
+++ b/src/lanes.c
@@ -295,6 +295,12 @@ LUAG_FUNC( linda_send)
         // make sure the keys are of a valid type
         check_key_types( L, key_i, key_i);
 
+        // make sure there is something to send
+        if( lua_gettop( L) == key_i)
+        {
+                luaL_error( L, "no data to send");
+        }
+
         // convert nils to some special non-nil sentinel in sent values
         keeper_toggle_nil_sentinels( L, key_i + 1, 1);