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require 'concurrent/utility/engine'
require 'concurrent/thread_safe/util'
module Concurrent
# @!macro concurrent_hash
#
# A thread-safe subclass of Hash. This version locks against the object
# itself for every method call, ensuring only one thread can be reading
# or writing at a time. This includes iteration methods like `#each`,
# which takes the lock repeatedly when reading an item.
#
# @see http://ruby-doc.org/core/Hash.html Ruby standard library `Hash`
# @!macro internal_implementation_note
HashImplementation = case
when Concurrent.on_cruby?
# Hash is not fully thread-safe on CRuby, see
# https://bugs.ruby-lang.org/issues/19237
# https://github.com/ruby/ruby/commit/ffd52412ab
# https://github.com/ruby-concurrency/concurrent-ruby/issues/929
# So we will need to add synchronization here (similar to Concurrent::Map).
::Hash
when Concurrent.on_jruby?
require 'jruby/synchronized'
class JRubyHash < ::Hash
include JRuby::Synchronized
end
JRubyHash
when Concurrent.on_truffleruby?
require 'concurrent/thread_safe/util/data_structures'
class TruffleRubyHash < ::Hash
end
ThreadSafe::Util.make_synchronized_on_truffleruby TruffleRubyHash
TruffleRubyHash
else
warn 'Possibly unsupported Ruby implementation'
::Hash
end
private_constant :HashImplementation
# @!macro concurrent_hash
class Hash < HashImplementation
end
end
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