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#--
# This file is part of Sonic Pi: http://sonic-pi.net
# Full project source: https://github.com/samaaron/sonic-pi
# License: https://github.com/samaaron/sonic-pi/blob/master/LICENSE.md
#
# Copyright 2013, 2014, 2015, 2016 by Sam Aaron (http://sam.aaron.name).
# All rights reserved.
#
# Permission is granted for use, copying, modification, and
# distribution of modified versions of this work as long as this
# notice is included.
#++
require 'thread'
## Assumes Immutable values used as val...
module SonicPi
class Atom
def initialize(val)
@val = val
@sem = Mutex.new
end
def swap!(&block)
Thread.current.thread_variable_set :sonic_pi_atom_last, @val
Thread.current.thread_variable_set :sonic_pi_atom_new, block.call(@val)
@sem.synchronize do
last = Thread.current.thread_variable_get(:sonic_pi_atom_last)
new = Thread.current.thread_variable_get(:sonic_pi_atom_new)
if @val == last
@val = new
return new
end
end
## Didn't work, try again...
swap!(&block)
end
def swap_returning_old!(&block)
Thread.current.thread_variable_set :sonic_pi_atom_last, @val
Thread.current.thread_variable_set :sonic_pi_atom_new, block.call(@val)
@sem.synchronize do
last = Thread.current.thread_variable_get(:sonic_pi_atom_last)
new = Thread.current.thread_variable_get(:sonic_pi_atom_new)
if @val == last
@val = new
return last
end
end
## Didn't work, try again...
swap_returning_old!(&block)
end
def deref
@val
end
def reset!(new_val)
@sem.synchronize do
@val = new_val
end
end
end
end
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