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86 lines
2.6 KiB
Ruby
86 lines
2.6 KiB
Ruby
require_relative '../../spec_helper'
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require_relative '../../shared/fiber/resume'
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require 'fiber'
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describe "Fiber#transfer" do
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it_behaves_like :fiber_resume, :transfer
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end
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describe "Fiber#transfer" do
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it "transfers control from one Fiber to another when called from a Fiber" do
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fiber1 = Fiber.new { :fiber1 }
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fiber2 = Fiber.new { fiber1.transfer; :fiber2 }
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fiber2.resume.should == :fiber1
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end
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it "returns to the root Fiber when finished" do
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f1 = Fiber.new { :fiber_1 }
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f2 = Fiber.new { f1.transfer; :fiber_2 }
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f2.transfer.should == :fiber_1
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f2.transfer.should == :fiber_2
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end
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it "can be invoked from the same Fiber it transfers control to" do
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states = []
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fiber = Fiber.new { states << :start; fiber.transfer; states << :end }
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fiber.transfer
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states.should == [:start, :end]
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states = []
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fiber = Fiber.new { states << :start; fiber.transfer; states << :end }
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fiber.resume
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states.should == [:start, :end]
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end
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it "can transfer control to a Fiber that has transferred to another Fiber" do
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states = []
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fiber1 = Fiber.new { states << :fiber1 }
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fiber2 = Fiber.new { states << :fiber2_start; fiber1.transfer; states << :fiber2_end}
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fiber2.resume.should == [:fiber2_start, :fiber1]
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fiber2.transfer.should == [:fiber2_start, :fiber1, :fiber2_end]
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end
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it "raises a FiberError when transferring to a Fiber which resumes itself" do
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fiber = Fiber.new { fiber.resume }
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-> { fiber.transfer }.should raise_error(FiberError)
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end
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it "works if Fibers in different Threads each transfer to a Fiber in the same Thread" do
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# This catches a bug where Fibers are running on a thread-pool
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# and Fibers from a different Ruby Thread reuse the same native thread.
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# Caching the Ruby Thread based on the native thread is not correct in that case,
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# and the check for "fiber called across threads" in Fiber#transfer
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# might be incorrect based on that.
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2.times do
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Thread.new do
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io_fiber = Fiber.new do |calling_fiber|
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calling_fiber.transfer
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end
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io_fiber.transfer(Fiber.current)
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value = Object.new
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io_fiber.transfer(value).should equal value
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end.join
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end
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end
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it "transfers control between a non-main thread's root fiber to a child fiber and back again" do
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states = []
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thread = Thread.new do
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f1 = Fiber.new do |f0|
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states << 0
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value2 = f0.transfer(1)
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states << value2
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3
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end
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value1 = f1.transfer(Fiber.current)
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states << value1
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value3 = f1.transfer(2)
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states << value3
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end
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thread.join
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states.should == [0, 1, 2, 3]
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end
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end
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