JRuby/Rubinius: doesn't abort C function when FFI::Function breaks

callback.c

#include <stdio.h>
typedef int (callback_fn) (void);

void
ten_times(callback_fn *callback)
{
	for (int i = 1; i <= 10; i++) {
		printf("libcallback: call #%i ...\n", i);
		int rc = (* callback)();
		if (rc == -1) {
			printf("libcallback: early return because rc == -1\n");
			return;
		}
	}
}

Makefile

libcallback.dylib: callback.c
	clang -dynamiclib -std=gnu99 callback.c -o $@

test.rb

require 'minitest/autorun'
require 'ffi'

module LibCallback
  extend ::FFI::Library

  lib_name = 'libcallback'
  ffi_lib "#{lib_name}.#{::FFI::Platform::LIBSUFFIX}"

  attach_function :ten_times, [:pointer], :void, blocking: true
end

def mk_callback
  FFI::Function.new(:void, [], blocking: true) do
    yield
  end
end

describe FFI::Function do
  def foo
    callback = mk_callback  do
      yield
    end
    LibCallback.ten_times(callback)
  end

  describe "with non-breaking block" do
    it "calls block 10 times" do
      called = 0
      foo { called += 1 }
      assert_equal 10, called
    end
  end

  describe "with breaking block" do

    it "doesn't call block anymore" do
      called = 0
      foo { called += 1; break }
      assert_equal 1, called
    end
  end
end

describe "pure Ruby block" do
  def foo
    10.times { yield }
  end

  describe "with non-breaking block" do
    it "calls block 10 times" do
      called = 0
      foo { called += 1 }
      assert_equal 10, called
    end
  end

  describe "with breaking block" do

    it "doesn't call block anymore" do
      called = 0
      foo { called += 1; break }
      assert_equal 1, called
    end
  end
end
__END__
##
# EXPECTED, as when run on Ruby 2.2.4
#
Run options: --seed 41083

# Running:

..libcallback: call #1 ...
libcallback: call #2 ...
libcallback: call #3 ...
libcallback: call #4 ...
libcallback: call #5 ...
libcallback: call #6 ...
libcallback: call #7 ...
libcallback: call #8 ...
libcallback: call #9 ...
libcallback: call #10 ...
.libcallback: call #1 ...
.

Finished in 0.002047s, 1954.3283 runs/s, 1954.3283 assertions/s.

4 runs, 4 assertions, 0 failures, 0 errors, 0 skips

##
# ACTUAL, when run on JRuby 9.0.4.0
#
Run options: --seed 3230

# Running:

.libcallback: call #1 ...
libcallback: call #2 ...
libcallback: call #3 ...
libcallback: call #4 ...
libcallback: call #5 ...
libcallback: call #6 ...
libcallback: call #7 ...
libcallback: call #8 ...
libcallback: call #9 ...
libcallback: call #10 ...
.libcallback: call #1 ...
libcallback: call #2 ...
libcallback: call #3 ...
libcallback: call #4 ...
libcallback: call #5 ...
libcallback: call #6 ...
libcallback: call #7 ...
libcallback: call #8 ...
libcallback: call #9 ...
libcallback: call #10 ...
F.

Finished in 0.023067s, 173.4047 runs/s, 173.4047 assertions/s.

  1) Failure:
FFI::Function::with breaking block#test_0001_doesn't call block anymore [test.rb:40]:
Expected: 1
  Actual: 10

4 runs, 4 assertions, 1 failures, 0 errors, 0 skips
ruby test.rb  6.48s user 0.29s system 330% cpu 2.048 total