Also compile the Event and (more importantly) AsyncResult class.

.gitignore

@@ -12,6 +12,7 @@ src/gevent/local.c
 src/gevent/greenlet.c
 src/gevent/_ident.c
 src/gevent/_imap.c
+src/gevent/event.c
 src/gevent/libev/corecext.c
 src/gevent/libev/corecext.h
 src/gevent/libev/_corecffi.c

CHANGES.rst

@@ -49,6 +49,10 @@ Enhancements
   ``IMapUnordered`` classes are now compiled with Cython, further
   reducing the overhead of ``[Thread]Pool.imap``.
 
+- The classes `gevent.event.Event` and `gevent.event.AsyncResult`
+  are compiled with Cython for improved performance. Please report any
+  compatibility issues.
+
 Monitoring and Debugging
 ------------------------
 

setup.py

@@ -99,12 +99,19 @@ IMAP = Extension(name="gevent.__imap",
                  depends=['src/gevent/__imap.pxd'],
                  include_dirs=include_dirs)
 
+EVENT = Extension(name="gevent._event",
+                  sources=["src/gevent/event.py"],
+                  depends=['src/gevent/_event.pxd'],
+                  include_dirs=include_dirs)
+
+
 _to_cythonize = [
     SEMAPHORE,
     LOCAL,
     GREENLET,
     IDENT,
     IMAP,
+    EVENT,
 ]
 
 EXT_MODULES = [
@@ -115,6 +122,7 @@ EXT_MODULES = [
     GREENLET,
     IDENT,
     IMAP,
+    EVENT,
 ]
 
 LIBEV_CFFI_MODULE = 'src/gevent/libev/_corecffi_build.py:ffi'
@@ -177,6 +185,12 @@ if PYPY:
     _to_cythonize.remove(SEMAPHORE)
     _to_cythonize.remove(IDENT)
 
+    EXT_MODULES.remove(IMAP)
+    _to_cythonize.remove(IMAP)
+
+    EXT_MODULES.remove(EVENT)
+    _to_cythonize.remove(EVENT)
+
 
 for mod in _to_cythonize:
     EXT_MODULES.remove(mod)

src/gevent/__imap.pxd

@@ -2,9 +2,12 @@ cimport cython
 from gevent._greenlet cimport Greenlet
 from gevent.__semaphore cimport Semaphore
 
+@cython.freelist(100)
 cdef class Failure:
     cdef readonly exc
-    cdef _raise_exception
+    cdef raise_exception
+
+cdef inline _raise_exc(Failure failure)
 
 cdef class IMapUnordered(Greenlet):
     cdef bint _zipped

src/gevent/_event.pxd

+cimport cython
+
+cdef _None
+cdef reraise
+cdef dump_traceback
+cdef load_traceback
+cdef get_hub
+
+cdef InvalidSwitchError
+cdef Timeout
+cdef bint _greenlet_imported
+
+cdef extern from "greenlet/greenlet.h":
+
+    ctypedef class greenlet.greenlet [object PyGreenlet]:
+        pass
+
+    # These are actually macros and so much be included
+    # (defined) in each .pxd, as are the two functions
+    # that call them.
+    greenlet PyGreenlet_GetCurrent()
+    void PyGreenlet_Import()
+
+cdef inline greenlet getcurrent():
+    return PyGreenlet_GetCurrent()
+
+cdef inline void greenlet_init():
+    global _greenlet_imported
+    if not _greenlet_imported:
+        PyGreenlet_Import()
+        _greenlet_imported = True
+
+cdef void _init()
+
+cdef class _AbstractLinkable:
+   cdef _notifier
+   cdef set _links
+   cdef readonly hub
+
+   cpdef rawlink(self, callback)
+   cpdef bint ready(self)
+   cpdef unlink(self, callback)
+
+   cdef _check_and_notify(self)
+   @cython.locals(todo=set)
+   cpdef _notify_links(self)
+   cdef _wait_core(self, timeout, catch=*)
+   cdef _wait_return_value(self, waited, wait_success)
+   cdef _wait(self, timeout=*)
+
+
+cdef class Event(_AbstractLinkable):
+   cdef bint _flag
+
+
+cdef class AsyncResult(_AbstractLinkable):
+    cdef readonly _value
+    cdef readonly tuple _exc_info
+
+    # For the use of _imap.py
+    cdef public int _imap_task_index
+
+    cpdef get(self, block=*, timeout=*)
+    cpdef bint successful(self)
+
+    cpdef wait(self, timeout=*)
+    cpdef bint done(self)
+
+    cpdef bint cancel(self)
+    cpdef bint cancelled(self)

src/gevent/_greenlet.pxd

@@ -43,7 +43,6 @@ cdef extern from "frameobject.h":
         # proper None instead.
         # cdef FrameType f_back
 
-
 cdef void _init()
 
 cdef class SpawnedLink:
@@ -119,9 +118,12 @@ cdef class Greenlet(greenlet):
     # This is used as the target of a callback
     # from the loop, and so needs to be a cpdef
     cpdef _notify_links(self)
-    # IMapUnordered greenlets in pools need to access this
-    # method
-    cpdef _raise_exception(self)
+
+    # Hmm, declaring _raise_exception causes issues when _imap
+    # is also compiled.
+    # TypeError: wrap() takes exactly one argument (0 given)
+    # cpdef _raise_exception(self)
+
 
 @cython.final
 cdef greenlet get_hub()

src/gevent/_imap.py

 # -*- coding: utf-8 -*-
 # Copyright (c) 2018 gevent
-# cython: auto_pickle=False,embedsignature=True,always_allow_keywords=False
+# cython: auto_pickle=False,embedsignature=True,always_allow_keywords=False,infer_types=True
 
 """
 Iterators across greenlets or AsyncResult objects.
@@ -24,18 +24,19 @@ locals()['Semaphore'] = _semaphore.Semaphore
 
 
 class Failure(object):
-    __slots__ = ('exc', '_raise_exception')
+    __slots__ = ('exc', 'raise_exception')
 
     def __init__(self, exc, raise_exception=None):
         self.exc = exc
-        self._raise_exception = raise_exception
+        self.raise_exception = raise_exception
 
-    def raise_exc(self):
-        if self._raise_exception:
-            self._raise_exception()
-        else:
-            raise self.exc
 
+def _raise_exc(failure):
+    # For cython.
+    if failure.raise_exception:
+        failure.raise_exception()
+    else:
+        raise failure.exc
 
 class IMapUnordered(Greenlet): # pylint:disable=undefined-variable
     """
@@ -102,7 +103,7 @@ class IMapUnordered(Greenlet): # pylint:disable=undefined-variable
             self._result_semaphore.release()
         value = self._inext()
         if isinstance(value, Failure):
-            raise value.exc
+            _raise_exc(value)
         return value
 
     next = __next__ # Py2

src/gevent/event.py

 # Copyright (c) 2009-2016 Denis Bilenko, gevent contributors. See LICENSE for details.
+# cython: auto_pickle=False,embedsignature=True,always_allow_keywords=False,infer_types=True
+
 """Basic synchronization primitives: Event and AsyncResult"""
 from __future__ import print_function
 import sys
@@ -8,19 +10,27 @@ from gevent._compat import reraise
 from gevent._tblib import dump_traceback, load_traceback
 
 from gevent.hub import _get_hub_noargs as get_hub
-from gevent.hub import getcurrent
+
 from gevent.hub import InvalidSwitchError
 from gevent.timeout import Timeout
 
 
-__all__ = ['Event', 'AsyncResult']
+__all__ = [
+    'Event',
+    'AsyncResult',
+]
+
+locals()['getcurrent'] = __import__('greenlet').getcurrent
+locals()['greenlet_init'] = lambda: None
+
+import cython
 
 
 class _AbstractLinkable(object):
     # Encapsulates the standard parts of the linking and notifying protocol
     # common to both repeatable events and one-time events (AsyncResult).
 
-    _notifier = None
+    __slots__ = ('_links', 'hub', '_notifier')
 
     def __init__(self):
         # Also previously, AsyncResult maintained the order of notifications, but Event
@@ -35,6 +45,7 @@ class _AbstractLinkable(object):
         # uniqueness would be with a 2.7+ OrderedDict.)
         self._links = set()
         self.hub = get_hub()
+        self._notifier = None
 
     def ready(self):
         # Instances must define this
@@ -95,14 +106,14 @@ class _AbstractLinkable(object):
         # bool(self._notifier) would turn to False as soon as we exit this
         # method anyway.
         del todo
-        del self._notifier
+        self._notifier = None
 
     def _wait_core(self, timeout, catch=Timeout):
         # The core of the wait implementation, handling
         # switching and linking. If *catch* is set to (),
         # a timeout that elapses will be allowed to be raised.
         # Returns a true value if the wait succeeded without timing out.
-        switch = getcurrent().switch
+        switch = getcurrent().switch # pylint:disable=undefined-variable
         self.rawlink(switch)
         try:
             with Timeout._start_new_or_dummy(timeout) as timer:
@@ -148,7 +159,11 @@ class Event(_AbstractLinkable):
         the waiting greenlets being awakened. These details may change in the future.
     """
 
-    _flag = False
+    __slots__ = ('_flag',)
+
+    def __init__(self):
+        _AbstractLinkable.__init__(self)
+        self._flag = False
 
     def __str__(self):
         return '<%s %s _links[%s]>' % (self.__class__.__name__, (self._flag and 'set') or 'clear', len(self._links))
@@ -157,8 +172,14 @@ class Event(_AbstractLinkable):
         """Return true if and only if the internal flag is true."""
         return self._flag
 
-    isSet = is_set  # makes it a better drop-in replacement for threading.Event
-    ready = is_set  # makes it compatible with AsyncResult and Greenlet (for example in wait())
+    def isSet(self):
+        # makes it a better drop-in replacement for threading.Event
+        return self._flag
+
+    def ready(self):
+        # makes it compatible with AsyncResult and Greenlet (for
+        # example in wait())
+        return self._flag
 
     def set(self):
         """
@@ -221,7 +242,7 @@ class Event(_AbstractLinkable):
         return self._wait(timeout)
 
     def _reset_internal_locks(self): # pragma: no cover
-        # for compatibility with threading.Event (only in case of patch_all(Event=True), by default Event is not patched)
+        # for compatibility with threading.Event
         #  Exception AttributeError: AttributeError("'Event' object has no attribute '_reset_internal_locks'",)
         # in <module 'threading' from '/usr/lib/python2.7/threading.pyc'> ignored
         pass
@@ -277,9 +298,12 @@ class AsyncResult(_AbstractLinkable):
        merged.
     """
 
-    _value = _NONE
-    _exc_info = ()
-    _notifier = None
+    __slots__ = ('_value', '_exc_info', '_imap_task_index')
+
+    def __init__(self):
+        _AbstractLinkable.__init__(self)
+        self._value = _NONE
+        self._exc_info = ()
 
     @property
     def _exception(self):
@@ -448,3 +472,12 @@ class AsyncResult(_AbstractLinkable):
         return False
 
     # exception is a method, we use it as a property
+
+def _init():
+    greenlet_init() # pylint:disable=undefined-variable
+
+_init()
+
+
+from gevent._util import import_c_accel
+import_c_accel(globals(), 'gevent._event')

src/gevent/greenlet.py

 # Copyright (c) 2009-2012 Denis Bilenko. See LICENSE for details.
 # cython: auto_pickle=False,embedsignature=True,always_allow_keywords=False
+
 from __future__ import absolute_import, print_function, division
 
 from sys import _getframe as sys_getframe