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require 'concurrent/utility/engine'
require 'concurrent/thread_safe/util'
module Concurrent
# @!macro concurrent_array
#
# A thread-safe subclass of Array. 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`.
#
# @note `a += b` is **not** a **thread-safe** operation on
# `Concurrent::Array`. It reads array `a`, then it creates new `Concurrent::Array`
# which is concatenation of `a` and `b`, then it writes the concatenation to `a`.
# The read and write are independent operations they do not form a single atomic
# operation therefore when two `+=` operations are executed concurrently updates
# may be lost. Use `#concat` instead.
#
# @see http://ruby-doc.org/core-2.2.0/Array.html Ruby standard library `Array`
# @!macro internal_implementation_note
ArrayImplementation = case
when Concurrent.on_cruby?
# Array is thread-safe in practice because CRuby runs
# threads one at a time and does not do context
# switching during the execution of C functions.
::Array
when Concurrent.on_jruby?
require 'jruby/synchronized'
class JRubyArray < ::Array
include JRuby::Synchronized
end
JRubyArray
when Concurrent.on_rbx?
require 'monitor'
require 'concurrent/thread_safe/util/data_structures'
class RbxArray < ::Array
end
ThreadSafe::Util.make_synchronized_on_rbx RbxArray
RbxArray
when Concurrent.on_truffleruby?
require 'concurrent/thread_safe/util/data_structures'
class TruffleRubyArray < ::Array
end
ThreadSafe::Util.make_synchronized_on_truffleruby TruffleRubyArray
TruffleRubyArray
else
warn 'Possibly unsupported Ruby implementation'
::Array
end
private_constant :ArrayImplementation
# @!macro concurrent_array
class Array < ArrayImplementation
end
end
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