[PATCH 2/5] queue_*: check for closed IO objects

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

Using a high max_events may mean some IO objects are closed
after they're retrieved from the kernel but before our Ruby
process has had a chance to get to them.
---
 lib/yahns/queue_epoll.rb  | 1 +
 lib/yahns/queue_kqueue.rb | 1 +
 2 files changed, 2 insertions(+)

diff --git a/lib/yahns/queue_epoll.rb b/lib/yahns/queue_epoll.rb
index 6d8a6ca..7f5c038 100644
--- a/lib/yahns/queue_epoll.rb
+++ b/lib/yahns/queue_epoll.rb
@@ -44,6 +44,7 @@ def worker_thread(logger, max_events)
       thr_init
       begin
         epoll_wait(max_events) do |_, io| # don't care for flags for now
+          next if io.closed?
 
           # Note: we absolutely must not do anything with io after
           # we've called epoll_ctl on it, io is exclusive to this
diff --git a/lib/yahns/queue_kqueue.rb b/lib/yahns/queue_kqueue.rb
index 531912b..229475c 100644
--- a/lib/yahns/queue_kqueue.rb
+++ b/lib/yahns/queue_kqueue.rb
@@ -53,6 +53,7 @@ def worker_thread(logger, max_events)
       thr_init
       begin
         kevent(nil, max_events) do |_,_,_,_,_,io| # don't care for flags for now
+          next if io.closed?
           # Note: we absolutely must not do anything with io after
           # we've called kevent(...,EV_ADD) on it, io is exclusive to this
           # thread only until kevent(...,EV_ADD) is called on it.