worker: avoid double SIGQUIT on unexpected parent death

Double SIGQUIT defeats the use of graceful shutdown.  We must not
watch the worker pipe again for readability after we've initiated
graceful shutdown.

1 files changed, 5 insertions, 2 deletions

diff --git a/lib/yahns/worker.rb b/lib/yahns/worker.rb
index 0d25acc..9b1bb8a 100644
--- a/lib/yahns/worker.rb
+++ b/lib/yahns/worker.rb
@@ -23,8 +23,11 @@ class Yahns::Worker # :nodoc:
   # This causes the worker to gracefully exit if the master
   # dies unexpectedly.
   def yahns_step
-    @to_io.kgio_tryread(11) == nil and Process.kill(:QUIT, $$)
-    :wait_readable
+    if @to_io.kgio_tryread(11) == nil
+      Process.kill(:QUIT, $$)
+      @to_io.close
+    end
+    :ignore
   end
 
   # worker objects may be compared to just plain Integers