test_wait}: give system some time to process the written data.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@31857 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
AF_UNIX, but windows socketpair doesn't support it. we can't
avoid platform check. sigh!
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@31472 b2dd03c8-39d4-4d8f-98ff-823fe69b080e