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