d8e6805206
* Use the `ConditionVariable` primitive to fix rece between stopped receiver Thread and its wake signal. * Race was only observable via synthetical benchmarks and explicit sleeps between unlocking receiver mutex and Thread.stop * Simplifies code a lot as thread must not be passed around anymore
46 lines
953 B
Ruby
46 lines
953 B
Ruby
module Mutant
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module Actor
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# Receiver side of an actor
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class Receiver
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include Adamantium::Flat, Concord.new(:condition_variable, :mutex, :messages)
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# Receives a message, blocking
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#
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# @return [Object]
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#
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# @api private
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#
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def call
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2.times do
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message = try_blocking_receive
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return message unless message.equal?(Undefined)
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end
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fail ProtocolError
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end
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private
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# Try a blocking receive
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#
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# @return [Undefined]
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# if there is no message yet
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#
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# @return [Object]
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# if there is a message
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#
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# @api private
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#
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def try_blocking_receive
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mutex.synchronize do
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if messages.empty?
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condition_variable.wait(mutex)
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Undefined
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else
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messages.shift
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end
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end
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end
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end # Receiver
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end # Actor
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end # Mutant
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