Bug in Signal Handling

I'm pretty sure we have found a bug in Ruby while working on TextMate.

This simple script shows the issue with recent versions of Ruby on at =20=

least Mac OS X and FreeBSD:

   #!/usr/bin/env ruby -wKU

   trap('SIGINT') { warn "#{Time.now} =E2=86=90 receive" }
   fork           { sleep 0.5
                    warn "#{Time.now} =E2=86=90 send"
                    Process.kill('SIGINT', Process.ppid) }

   %x{true} # comment out this line to eliminate the pause

   pid =3D fork { exec('sleep', '4') }
   Process.wait(pid)

When this script is run we see a four second delay between the two =20
times. However, you can comment out the %w{true} line and the script =20
then behaves as expected (no delay).

Using SIGUSR1 instead of SIGINT also resolves the issue.

The script did work correctly on CentOS with Ruby 1.8.1, so either =20
the change of OS helped or it's a newer bug.

James Edward Gray II