Spawning within threads throws exception

[Matt Conway]

Using fork method for spawn. I have a daemon which spawns jobs on request, but I wanted to limit concurrency, so created 3 worker threads to do the spawning within. I then ran into this race condition, and extracted the failure into the simplified code below. Any ideas? I was unable to figure out what is going wrong. Its probably something weird in my environment as I can't duplicate it in a fresh rails app

foo.rb:
class SpawnInit
include Spawn
def initialize
sid = spawn do
puts "Spawn initialized"
end
wait([sid])
end
end

threads = []
threads << Thread.new { SpawnInit.new }
threads << Thread.new { SpawnInit.new }
threads.each {|t| t.join}

within RAILS_ROOT

./script/runner foo.rb

/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/monitor.rb:285:in stop': stopping only thread (ThreadError) note: use sleep to stop forever from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/monitor.rb:285:inmon_acquire'
from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/monitor.rb:214:in mon_enter' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/monitor.rb:240:insynchronize'
from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/logger.rb:496:in write' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/logger.rb:326:inadd'
from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/logger.rb:374:in info' from /Users/mconway/Documents/eclipse/workspace/sml/vendor/plugins/spawn/lib/spawn.rb:118:infork_it'
from /Users/mconway/Documents/eclipse/workspace/sml/vendor/plugins/spawn/lib/spawn.rb:90:in fork' ... 9 levels... from /Users/mconway/Documents/eclipse/workspace/sml/vendor/rails/railties/lib/commands/runner.rb:45 from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:ingem_original_require'
from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `require'
from ./script/runner:3
Spawn initialized

[Matt Conway]

Some more info, this does happen with a fresh rails app once you replace the logger in environment.rb:
config.logger = Logger.new(config.log_path)

[Michael Noack]

Closing to clean up as this in an old issue, if this is still valid on the latest version of spawnling then please re-open the issue and I will address it.