Change lane:join() return values

* when no error is raised in the lane, lane:join() now precedes the lane returned values with true
* lane body is no longer forced to return something when used with join()
* adjusted all relevant unit tests accordingly

1 files changed, 4 insertions, 3 deletions

diff --git a/tests/linda_perf.lua b/tests/linda_perf.lua
index 83b8921..e68d552 100644
--- a/tests/linda_perf.lua
+++ b/tests/linda_perf.lua
@@ -56,7 +56,7 @@ local eater = function( l, loop)
         -- print "loop is over"
         key, val = l:receive( "done")
         print("eater: done ("..val..")")
-        return true
+        return "ate everything"
 end
 
 -- #################################################################################################
@@ -74,7 +74,7 @@ local gobbler = function( l, loop, batch)
         print "loop is over"
         key, val = l:receive( "done")
         print("gobbler: done ("..val..")")
-        return true
+        return "gobbled everything"
 end
 
 -- #################################################################################################
@@ -123,7 +123,8 @@ local function ziva1( preloop, loop, batch)
                 end
         end
         l:send( "done" ,"are you happy?")
-        lane:join()
+        local r, ret = lane:join()
+        assert(r == true and type(ret) == "string", "got " .. tostring(r) .. " " .. tostring(ret))
         return lanes.now_secs() - t1
 end