Initial wrapping of kj/async Promises and EventLoop

capnp/async_cpp.pxd

@@ -0,0 +1,31 @@
+# schema.capnp.cpp.pyx
+# distutils: language = c++
+# distutils: extra_compile_args = --std=c++11
+
+from cpython.ref cimport PyObject
+
+cdef extern from "kj/exception.h" namespace " ::kj":
+    cdef cppclass Exception:
+        pass
+        
+cdef extern from "kj/async.h" namespace " ::kj":
+    cdef cppclass Promise[T]:
+        Promise(Promise)
+        T wait()
+
+ctypedef Promise[PyObject *] PyPromise
+
+cdef extern from "kj/async.h" namespace " ::kj":
+    cdef cppclass EventLoop:
+        EventLoop()
+        # Promise[void] yieldFrom'yield'()
+        object wait(PyPromise)
+        object there(PyPromise)
+        PyPromise evalLater(PyObject * func)
+        PyPromise there(PyPromise, PyObject * func)
+    cdef cppclass SimpleEventLoop(EventLoop):
+        pass
+
+cdef extern from "asyncHelper.h":
+    PyPromise evalLater(EventLoop &, PyObject * func)
+    PyPromise there(EventLoop & loop, PyPromise & promise, PyObject * func, PyObject * error_func)