Compile greenlet with Cython to make up for most of the lost speed.

We're now only ~2x slower, instead of 10x.

.gitignore

@@ -9,6 +9,7 @@ gevent.*.[ch]
 src/gevent/__pycache__
 src/gevent/_semaphore.c
 src/gevent/local.c
+src/gevent/greenlet.c
 src/gevent/libev/corecext.c
 src/gevent/libev/corecext.h
 src/gevent/libev/_corecffi.c

CHANGES.rst

@@ -90,6 +90,9 @@
   a "spawn tree local" mapping. Based on a proposal from PayPal and
   comments by Mahmoud Hashemi and Kurt Rose. See :issue:`755`.
 
+- The :mod:`gevent.greenlet` module is now compiled with Cython to
+  offset any performance loss due to :issue:`755`.
+
 1.3a1 (2018-01-27)
 ==================
 

doc/conf.py

@@ -223,7 +223,6 @@
 # prevent some stuff from showing up in docs
 import socket
 import gevent.socket
-del gevent.Greenlet.throw
 for item in gevent.socket.__all__[:]:
     if getattr(gevent.socket, item) is getattr(socket, item, None):
         gevent.socket.__all__.remove(item)

doc/gevent.rst

@@ -36,25 +36,7 @@ generated.
 
 .. automethod:: Greenlet.__init__
 
-.. attribute:: Greenlet.value
-
-    Holds the value returned by the function if the greenlet has
-    finished successfully. Until then, or if it finished in error, ``None``.
-
-    .. tip:: Recall that a greenlet killed with the default
-             :class:`GreenletExit` is considered to have finished
-             successfully, and the ``GreenletExit`` exception will be
-             its value.
-
 .. autoattribute:: Greenlet.exception
-.. autoattribute:: Greenlet.spawn_tree_locals
-   :annotation: = {}
-.. autoattribute:: Greenlet.spawning_greenlet
-   :annotation: = weakref.ref()
-.. autoattribute:: Greenlet.spawning_stack
-   :annotation: = <Frame>
-.. autoattribute:: Greenlet.spawning_stack_limit
-
 .. automethod:: Greenlet.ready
 .. automethod:: Greenlet.successful
 .. automethod:: Greenlet.start

setup.py

@@ -4,6 +4,7 @@
 import sys
 import os
 import os.path
+import sysconfig
 
 # setuptools is *required* on Windows
 # (https://bugs.python.org/issue23246) and for PyPy. No reason not to
@@ -59,11 +60,28 @@
                   depends=['src/gevent/local.pxd'])
 LOCAL = cythonize1(LOCAL)
 
+# The sysconfig dir is not enough if we're in a virtualenv
+# See https://github.com/pypa/pip/issues/4610
+include_dirs = [sysconfig.get_path("include")]
+venv_include_dir = os.path.join(sys.prefix, 'include', 'site',
+                                'python' + sysconfig.get_python_version())
+venv_include_dir = os.path.abspath(venv_include_dir)
+if os.path.exists(venv_include_dir):
+    include_dirs.append(venv_include_dir)
+
+
+GREENLET = Extension(name="gevent.greenlet",
+                     sources=["src/gevent/greenlet.py"],
+                     depends=['src/gevent/greenlet.pxd'],
+                     include_dirs=include_dirs)
+GREENLET = cythonize1(GREENLET)
+
 EXT_MODULES = [
     CORE,
     ARES,
     SEMAPHORE,
     LOCAL,
+    GREENLET,
 ]
 
 LIBEV_CFFI_MODULE = 'src/gevent/libev/_corecffi_build.py:ffi'
@@ -91,6 +109,7 @@
     setup_requires = []
     EXT_MODULES.remove(CORE)
     EXT_MODULES.remove(LOCAL)
+    EXT_MODULES.remove(GREENLET)
     EXT_MODULES.remove(SEMAPHORE)
     # By building the semaphore with Cython under PyPy, we get
     # atomic operations (specifically, exiting/releasing), at the

src/gevent/greenlet.pxd

@@ -0,0 +1,80 @@
+# cython: auto_pickle=False
+
+cimport cython
+
+
+cdef extern from "greenlet/greenlet.h":
+
+  ctypedef class greenlet.greenlet [object PyGreenlet]:
+      pass
+
+
+cdef class SpawnedLink:
+    cdef public object callback
+
+
+@cython.final
+cdef class SuccessSpawnedLink(SpawnedLink):
+    pass
+
+@cython.final
+cdef class FailureSpawnedLink(SpawnedLink):
+    pass
+
+@cython.final
+@cython.internal
+cdef class _Frame:
+    cdef readonly object f_code
+    cdef readonly int f_lineno
+    cdef public _Frame f_back
+
+
+cdef class Greenlet(greenlet):
+    cdef readonly object value
+    cdef readonly args
+    cdef readonly object spawning_greenlet
+    cdef public dict spawn_tree_locals
+
+    cdef readonly _Frame spawning_stack
+    # A test case reads these, otherwise they would
+    # be private
+    cdef readonly tuple _exc_info
+    cdef readonly list _links
+
+    cdef object _notifier
+    cdef object _start_event
+    cdef dict _kwargs
+
+
+    cdef bint __started_but_aborted(self)
+    cdef bint __start_cancelled_by_kill(self)
+    cdef bint __start_pending(self)
+    cdef bint __never_started_or_killed(self)
+    cdef bint __start_completed(self)
+
+    cdef __cancel_start(self)
+
+    cdef _report_result(self, object result)
+    cdef _report_error(self, tuple exc_info)
+
+
+@cython.final
+@cython.internal
+cdef class _dummy_event:
+    cdef readonly bint pending
+    cdef readonly bint active
+
+    cpdef stop(self)
+    cpdef start(self, cb)
+    cpdef close(self)
+
+cdef _dummy_event _cancelled_start_event
+cdef _dummy_event _start_completed_event
+
+
+@cython.locals(diehards=list)
+cdef _killall3(list greenlets, object exception, object waiter)
+cdef _killall(list greenlets, object exception)
+
+@cython.locals(done=list)
+cpdef joinall(greenlets, timeout=*, raise_error=*, count=*)