Ruby

=begin
遠藤です。

Fiber は自分自身を (直接または間接的に) resume しようとすると
double resume という例外を投げますが

require "fiber"
Fiber.new do
Fiber.current.resume #=> double resume (FiberError)
end

root fiber の場合は 1 回目だけ何も言いません。

require "fiber"
Fiber.current.resume #=> nil
Fiber.current.resume #=> double resume (FiberError)

diff --git a/cont.c b/cont.c
index b0b3f41..b0defca 100644
--- a/cont.c
+++ b/cont.c
@@ -1292,7 +1292,7 @@ rb_fiber_resume(VALUE fibval, int argc, VALUE *argv)
rb_fiber_t *fib;
GetFiberPtr(fibval, fib);

• if (fib->prev != Qnil) {

• if (fib->prev != Qnil || fib->cont.type == ROOT_FIBER_CONTEXT) {
  rb_raise(rb_eFiberError, "double resume");
  }

diff --git a/test/ruby/test_fiber.rb b/test/ruby/test_fiber.rb
index edfe55a..ec64f98 100644
--- a/test/ruby/test_fiber.rb
+++ b/test/ruby/test_fiber.rb
@@ -189,5 +189,13 @@ class TestFiber < Test::Unit::TestCase
f1.transfer
}, '[ruby-dev:40833]'
end
+

• def test_resume_root_fiber
• assert_raise(FiberError) do

•  Thread.new do
  

•    Fiber.current.resume
  

•  end.join
  

• end
• end
  end

--
Yusuke Endoh [email protected]
=end