Commits on Jan 25, 2019

1. Query ruby thread and GVL states instead of relying on our call frame… …

   … for callbacks
   
   This fixes ffi#527 and other interoperability issues that can happen,
   when a callback is called without a valid call frame.
   
   The change is enabled for ruby-2.3+ only, since it requires the
   functions ruby_native_thread_p() and ruby_thread_has_gvl_p().
   
   The creation of a call frame is not (yet) removed, because
   it still carries callback expections around.

   

   larskanis committed Jan 25, 2019
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2. Add tests for calls between Fiddle and FFI …

   This is particular interesting because FFI stores thread local call info
   on the stack, which is retrieved when a callback is received.
   This is something that Fiddle doesn't do, but a callback should be handled
   gracefully nevertheless.
   
   The test "from fiddle to ffi" fails without the previous commit.
   
   These tests succeed on MRI and on JRuby (provided
   jruby/jruby#4518 will be merged).

   

   larskanis committed Jan 25, 2019
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3. Add a test case for embedded ruby use and issue ffi#527 …

   Since the problem is a dead lock (inside pthread_cond_wait, on Linux), the test
   case has to spawn a separate process which can be killed on failure.

   

   kugel- authored and larskanis committed Jan 25, 2019
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4. Fix embed-test on Windows …

   Windows doesn't resolve symbols of external DLLs, if called with
   CURRENT_PROCESS. Instead the DLL has to be named explicit.
   
   Add an expectation to the spec while being over it.

   

   larskanis committed Jan 25, 2019
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