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