From 225a108c5326fdc1a00531908a2278c06ac782f6 Mon Sep 17 00:00:00 2001
From: Eric Wong <normalperson@yhbt.net>
Date: Fri, 13 Feb 2009 21:02:10 -0800
Subject: trap SIGCHLD and wakeup master on it

And avoid repeatedly sending kill -0 to each worker,
that nugget of stupid probably slipped in while I was
testing something...
---
 lib/unicorn.rb | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/unicorn.rb b/lib/unicorn.rb
index 63d7f5c..df94a96 100644
--- a/lib/unicorn.rb
+++ b/lib/unicorn.rb
@@ -159,14 +159,13 @@ module Unicorn
       @rd_sig, @wr_sig = IO.pipe unless (@rd_sig && @wr_sig)
       @rd_sig.nonblock = @wr_sig.nonblock = true
 
-      %w(QUIT INT TERM USR1 USR2 HUP).each { |sig| trap_deferred(sig) }
+      %w(CHLD QUIT INT TERM USR1 USR2 HUP).each { |sig| trap_deferred(sig) }
       $0 = "unicorn master"
       begin
         loop do
           reap_all_workers
           case @mode
           when :idle
-            kill_each_worker(0) # ensure they're running
             murder_lazy_workers
             spawn_missing_workers
           when 'QUIT' # graceful shutdown
@@ -376,6 +375,7 @@ module Unicorn
     # by the user.
     def init_worker_process(worker)
       %w(TERM INT QUIT USR1 USR2 HUP).each { |sig| trap(sig, 'IGNORE') }
+      trap('CHLD', 'DEFAULT')
       $0 = "unicorn worker[#{worker.nr}]"
       @rd_sig.close if @rd_sig
       @wr_sig.close if @wr_sig
-- 
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