[PATCH 1/3] do not sleep if signals are pending

[Eric Wong <e@80x24.org>]

This should prevent missed/delayed wakeups if repeatedly
kill(2)-ed.
---
 lib/yahns/server.rb    | 3 ++-
 lib/yahns/server_mp.rb | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/yahns/server.rb b/lib/yahns/server.rb
index d13c57e..208b5ee 100644
--- a/lib/yahns/server.rb
+++ b/lib/yahns/server.rb
@@ -476,7 +476,8 @@ def reap_reexec
   end
 
   def sp_sig_handle(alive)
-    @sev.wait_readable(alive ? nil : 0.01)
+    tout = alive ? (@sig_queue.empty? ? nil : 0) : 0.01
+    @sev.wait_readable(tout)
     @sev.yahns_step
     case sig = @sig_queue.shift
     when :QUIT, :TERM, :INT
diff --git a/lib/yahns/server_mp.rb b/lib/yahns/server_mp.rb
index 5467674..d56d1ed 100644
--- a/lib/yahns/server_mp.rb
+++ b/lib/yahns/server_mp.rb
@@ -157,7 +157,8 @@ def run_mp_worker(worker)
   def mp_sig_handle(watch, alive)
     # not performance critical
     watch.delete_if { |io| io.to_io.closed? }
-    if r = select(watch, nil, nil, alive ? nil : 0.1)
+    tout = alive ? (@sig_queue.empty? ? nil : 0) : 0.01
+    if r = select(watch, nil, nil, tout)
       r[0].each(&:yahns_step)
     end
     case @sig_queue.shift