Ruby » Ruby master

merge revision(s) r33826:

    * io.c (rb_io_fsync,rb_io_fdatasync): release GVL during fsync().
      fsync() and fdatasync() may take a long time on slow disks and/or
      if there is much dirty data.
      Patch by Eric Wong. [Feature #5665] [ruby-core:41247]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@34451 b2dd03c8-39d4-4d8f-98ff-823fe69b080e