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rails--rails/activesupport/test/fork_tracker_test.rb

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# frozen_string_literal: true
require "abstract_unit"
class ForkTrackerTest < ActiveSupport::TestCase
def test_object_fork
read, write = IO.pipe
called = false
handler = ActiveSupport::ForkTracker.after_fork do
called = true
write.write "forked"
end
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assert_not respond_to?(:fork)
pid = fork do
read.close
write.close
exit!
end
write.close
Process.waitpid(pid)
assert_equal "forked", read.read
read.close
assert_not called
ensure
ActiveSupport::ForkTracker.unregister(handler)
end
def test_object_fork_without_block
read, write = IO.pipe
called = false
handler = ActiveSupport::ForkTracker.after_fork do
called = true
write.write "forked"
end
if pid = fork
write.close
Process.waitpid(pid)
assert_equal "forked", read.read
read.close
assert_not called
else
read.close
write.close
exit!
end
ensure
ActiveSupport::ForkTracker.unregister(handler)
end
def test_process_fork
read, write = IO.pipe
called = false
handler = ActiveSupport::ForkTracker.after_fork do
called = true
write.write "forked"
end
pid = Process.fork do
read.close
write.close
exit!
end
write.close
Process.waitpid(pid)
assert_equal "forked", read.read
read.close
assert_not called
ensure
ActiveSupport::ForkTracker.unregister(handler)
end
def test_process_fork_without_block
read, write = IO.pipe
called = false
handler = ActiveSupport::ForkTracker.after_fork do
called = true
write.write "forked"
end
if pid = Process.fork
write.close
Process.waitpid(pid)
assert_equal "forked", read.read
read.close
assert_not called
else
read.close
write.close
exit!
end
ensure
ActiveSupport::ForkTracker.unregister(handler)
end
def test_kernel_fork
read, write = IO.pipe
called = false
handler = ActiveSupport::ForkTracker.after_fork do
called = true
write.write "forked"
end
pid = Kernel.fork do
read.close
write.close
exit!
end
write.close
Process.waitpid(pid)
assert_equal "forked", read.read
read.close
assert_not called
ensure
ActiveSupport::ForkTracker.unregister(handler)
end
def test_kernel_fork_without_block
read, write = IO.pipe
called = false
handler = ActiveSupport::ForkTracker.after_fork do
called = true
write.write "forked"
end
if pid = Kernel.fork
write.close
Process.waitpid(pid)
assert_equal "forked", read.read
read.close
assert_not called
else
read.close
write.close
exit!
end
ensure
ActiveSupport::ForkTracker.unregister(handler)
end
def test_check
count = 0
handler = ActiveSupport::ForkTracker.after_fork { count += 1 }
assert_no_difference -> { count } do
3.times { ActiveSupport::ForkTracker.check! }
end
Process.stub(:pid, Process.pid + 1) do
assert_difference -> { count }, +1 do
3.times { ActiveSupport::ForkTracker.check! }
end
end
assert_difference -> { count }, +1 do
3.times { ActiveSupport::ForkTracker.check! }
end
ensure
ActiveSupport::ForkTracker.unregister(handler)
end
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def test_basic_object_with_kernel_fork
read, write = IO.pipe
called = false
handler = ActiveSupport::ForkTracker.after_fork do
called = true
write.write "forked"
end
klass = Class.new(BasicObject) do
include ::Kernel
def fark(&block)
fork(&block)
end
end
object = klass.new
assert_not object.respond_to?(:fork)
pid = object.fark do
read.close
write.close
exit!
end
write.close
Process.waitpid(pid)
assert_equal "forked", read.read
read.close
assert_not called
ensure
ActiveSupport::ForkTracker.unregister(handler)
end
end if Process.respond_to?(:fork)