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require 'concurrent/utility/native_extension_loader' # load native parts first
module Concurrent
module Synchronization
case
when Concurrent.on_cruby?
def self.full_memory_barrier
# relying on undocumented behavior of CRuby, GVL acquire has lock which ensures visibility of ivars
# https://github.com/ruby/ruby/blob/ruby_2_2/thread_pthread.c#L204-L211
end
when Concurrent.on_jruby?
require 'concurrent/utility/native_extension_loader'
def self.full_memory_barrier
JRubyAttrVolatile.full_memory_barrier
end
when Concurrent.on_truffleruby?
def self.full_memory_barrier
TruffleRuby.full_memory_barrier
end
else
warn 'Possibly unsupported Ruby implementation'
def self.full_memory_barrier
end
end
end
end
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