From: "ara.t.howard" <ara.t.howard@...>
Date: 2007-12-28T23:58:42+09:00
Subject: portable signals


cfp:~ > cat a.rb
#
# on windows signals don't work.  least wise you cannot send, for  
instance,
# SIGABRT to another process.  rather, you can only signal yourself!   
to get
# around this limitation a tiny drb service, fronting the Process object
# itself, can be setup to allow one process to signal another by  
making a drb
# call that actually causes the other process to signal *itself*.   
you've
# really got to love ruby at times like these.
#
   require 'drb'

   mode = ARGV.shift || 'servant'
   uri = ARGV.shift
   signal = 'ABRT'

   start_server = lambda do
     trap(signal){ puts "#{ Process.pid } got #{ signal }..." }
     DRb.start_service 'druby://localhost:0', Process
     uri = DRb.uri
   end

   start_client = lambda do
     DRb.start_service 'druby://localhost:0'
     process = DRbObject.new nil, uri
   end

   case mode
     when /server/i
       puts "server.pid => #{ Process.pid }."
       uri = start_server.call
       puts DRb.uri
       loop do
         puts "not blocking..."
         sleep 1
       end

     when /client/i
       puts "client.pid => #{ Process.pid }."
       process = start_client.call
       process.kill signal, process.pid

     when /servant/i
       puts "server.pid => #{ Process.pid }."
       uri = start_server.call
       Thread.new do
         loop do
           puts "not blocking..."
           sleep 1
         end
       end
       program = __FILE__
       client_program = "ruby #{ program } client #{ uri }"
       4.times do
         system client_program
         sleep 1
       end
   end


cfp:~ > ruby a.rb
server.pid => 1593.
not blocking...
client.pid => 1594.
1593 got ABRT...
not blocking...
client.pid => 1595.
1593 got ABRT...
not blocking...
client.pid => 1596.
1593 got ABRT...
not blocking...
client.pid => 1597.
1593 got ABRT...
not blocking...



a @ http://codeforpeople.com/
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