From e786aa711da8e64734d20acfd9c6b8df0b4515c5 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 21 Nov 2012 13:40:00 +0000
Subject: io/wait: add IO#wait_writable method

* ext/io/wait/wait.c (io_wait_writable): this is easier to use than
  IO.select for a single IO object and is immune to the
  limitations/innefficiency of select() on platforms where poll/ppoll
  is available.  patched by Eric Wong.  [Feature #4646]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37785 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 test/io/wait/test_io_wait.rb | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

(limited to 'test/io/wait')

diff --git a/test/io/wait/test_io_wait.rb b/test/io/wait/test_io_wait.rb
index 3cf967e467..676809cfc7 100644
--- a/test/io/wait/test_io_wait.rb
+++ b/test/io/wait/test_io_wait.rb
@@ -1,3 +1,4 @@
+# -*- coding: us-ascii -*-
 require 'test/unit'
 require 'timeout'
 require 'socket'
@@ -69,4 +70,39 @@ class TestIOWait < Test::Unit::TestCase
     Thread.new { sleep 0.01; @w.close }
     assert_nil @r.wait
   end
+
+  def test_wait_writable
+    assert_equal @w, @w.wait_writable
+  end
+
+  def test_wait_writable_timeout
+    assert_equal @w, @w.wait_writable(0.001)
+    written = fill_pipe
+    assert_nil @w.wait_writable(0.001)
+    @r.read(written)
+    assert_equal @w, @w.wait_writable(0.001)
+  end
+
+  def test_wait_writable_EPIPE
+    fill_pipe
+    @r.close
+    assert_equal @w, @w.wait_writable
+  end
+
+  def test_wait_writable_closed
+    @w.close
+    assert_raises(IOError) { @w.wait_writable }
+  end
+
+private
+
+  def fill_pipe
+    written = 0
+    buf = " " * 4096
+    begin
+      written += @w.write_nonblock(buf)
+    rescue Errno::EAGAIN
+      return written
+    end while true
+  end
 end if IO.method_defined?(:wait)
-- 
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