[ruby-core:67839] [ruby-trunk - Bug #10786] [Open] SIGINT can not interrupt remaining codes after XMLRPC::Server gets SIGINT

Issue #10786 has been reported by Changbeom Yun.

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Bug #10786: SIGINT can not interrupt remaining codes after XMLRPC::Server gets SIGINT
https://bugs.ruby-lang.org/issues/10786

* Author: Changbeom Yun
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-linux]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
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When XMLRPC::Server has started completely, a user presses Ctrl-C to send SIGINT. XMLRPC::Server stops by SIGINT.

Assuming there are remaining codes to be run after XMLRPC::Server stops, When a user tries to press Ctrl-C again to interrupt, it doesn't function.

No exception is raised and a user has to wait until Ruby reaches the end of a program, because SIGINT doesn't work at all.

Code used for test:

```ruby

require "xmlrpc/server"

rpcd = XMLRPC::Server.new
rpcd.serve
puts "Wait 30 seconds in main thread"
sleep 30
puts "Done"

```

Reproducing procedure:

1. Save above source into a Ruby file.
2. Run it with Ruby.
3. Wait until XMLRPC::Server(Actually, WEBrick) message 'INFO  WEBrick::HTTPServer#start' appears.
4. Press Ctrl-C. (At this time, WEBrick gets shut down.)
5. When 'Wait 30 seconds in main thread' appears, press Ctrl-C again.




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