Merge pull request #940 from ruby-concurrency/jruby-compatibility

JRuby compatibility

Author: eregon

spec/concurrent/channel/integration_spec.rb

@@ -66,6 +66,7 @@
     end
 
     specify 'default-selection.rb', notravis: true do
+      (pending('flaky on JRuby'); fails) if Concurrent.on_jruby?
 expected = <<-STDOUT
     .
     .

spec/concurrent/executor/ruby_thread_pool_executor_spec.rb

@@ -23,8 +23,7 @@ module Concurrent
 
     it_should_behave_like :thread_pool_executor
 
-
-    context :prune do
+    context :prune, if: !Concurrent.on_jruby? do # pruning is flaky on JRuby
       subject do
         RubyThreadPoolExecutor.new(idletime: 5, min_threads: 2, max_threads: 10)
       end

spec/concurrent/executor/safe_task_executor_spec.rb

@@ -109,6 +109,7 @@ def execute
         end
 
         it 'should return success' do
+          (pending('possible local jump bug on JRuby https://github.com/jruby/jruby/issues/7136'); fails) if Concurrent.on_jruby?
           success, _value, _reason = subject
           expect(success).to be_truthy
         end
@@ -119,6 +120,7 @@ def execute
         end
 
         it 'should return a nil reason' do
+          (pending('possible local jump bug on JRuby https://github.com/jruby/jruby/issues/7136'); fails) if Concurrent.on_jruby?
           _success, _value, reason = subject
           expect(reason).to be_nil
         end