Issue #26801: Added C implementation of asyncio.Future.

Original patch by Yury Selivanov.

Lib/asyncio/futures.py

@@ -120,6 +120,46 @@ def isfuture(obj):
     return getattr(obj, '_asyncio_future_blocking', None) is not None
 
 
+def _format_callbacks(cb):
+    """helper function for Future.__repr__"""
+    size = len(cb)
+    if not size:
+        cb = ''
+
+    def format_cb(callback):
+        return events._format_callback_source(callback, ())
+
+    if size == 1:
+        cb = format_cb(cb[0])
+    elif size == 2:
+        cb = '{}, {}'.format(format_cb(cb[0]), format_cb(cb[1]))
+    elif size > 2:
+        cb = '{}, <{} more>, {}'.format(format_cb(cb[0]),
+                                        size-2,
+                                        format_cb(cb[-1]))
+    return 'cb=[%s]' % cb
+
+
+def _future_repr_info(future):
+    # (Future) -> str
+    """helper function for Future.__repr__"""
+    info = [future._state.lower()]
+    if future._state == _FINISHED:
+        if future._exception is not None:
+            info.append('exception={!r}'.format(future._exception))
+        else:
+            # use reprlib to limit the length of the output, especially
+            # for very long strings
+            result = reprlib.repr(future._result)
+            info.append('result={}'.format(result))
+    if future._callbacks:
+        info.append(_format_callbacks(future._callbacks))
+    if future._source_traceback:
+        frame = future._source_traceback[-1]
+        info.append('created at %s:%s' % (frame[0], frame[1]))
+    return info
+
+
 class Future:
     """This class is *almost* compatible with concurrent.futures.Future.
 
@@ -172,45 +212,10 @@ class Future:
         if self._loop.get_debug():
             self._source_traceback = traceback.extract_stack(sys._getframe(1))
 
-    def __format_callbacks(self):
+    _repr_info = _future_repr_info
-        cb = self._callbacks
-        size = len(cb)
-        if not size:
-            cb = ''
-
-        def format_cb(callback):
-            return events._format_callback_source(callback, ())
-
-        if size == 1:
-            cb = format_cb(cb[0])
-        elif size == 2:
-            cb = '{}, {}'.format(format_cb(cb[0]), format_cb(cb[1]))
-        elif size > 2:
-            cb = '{}, <{} more>, {}'.format(format_cb(cb[0]),
-                                            size-2,
-                                            format_cb(cb[-1]))
-        return 'cb=[%s]' % cb
-
-    def _repr_info(self):
-        info = [self._state.lower()]
-        if self._state == _FINISHED:
-            if self._exception is not None:
-                info.append('exception={!r}'.format(self._exception))
-            else:
-                # use reprlib to limit the length of the output, especially
-                # for very long strings
-                result = reprlib.repr(self._result)
-                info.append('result={}'.format(result))
-        if self._callbacks:
-            info.append(self.__format_callbacks())
-        if self._source_traceback:
-            frame = self._source_traceback[-1]
-            info.append('created at %s:%s' % (frame[0], frame[1]))
-        return info
 
     def __repr__(self):
-        info = self._repr_info()
+        return '<%s %s>' % (self.__class__.__name__, ' '.join(self._repr_info()))
-        return '<%s %s>' % (self.__class__.__name__, ' '.join(info))
 
     # On Python 3.3 and older, objects with a destructor part of a reference
     # cycle are never destroyed. It's not more the case on Python 3.4 thanks
@@ -426,6 +431,21 @@ def _copy_future_state(source, dest):
             dest.set_result(result)
 
 
+try:
+    import _futures
+except ImportError:
+    pass
+else:
+    _futures._init_module(
+        traceback.extract_stack,
+        events.get_event_loop,
+        _future_repr_info,
+        InvalidStateError,
+        CancelledError)
+
+    Future = _futures.Future
+
+
 def _chain_future(source, destination):
     """Chain two futures so that when one completes, so does the other.
 

Misc/NEWS

@@ -10,6 +10,9 @@ What's New in Python 3.6.0 beta 2
 Core and Builtins
 -----------------
 
+- Issue #26801: Added C implementation of asyncio.Future.
+  Original patch by Yury Selivanov.
+
 - Issue #28379: Added sanity checks and tests for PyUnicode_CopyCharacters().
   Patch by Xiang Zhang.
 

Modules/Setup.dist

@@ -181,6 +181,7 @@ _symtable symtablemodule.c
 #_datetime _datetimemodule.c	# datetime accelerator
 #_bisect _bisectmodule.c	# Bisection algorithms
 #_heapq _heapqmodule.c	# Heap queue algorithm
+#_futures _futuresmodule.c  # Fast asyncio Future
 
 #unicodedata unicodedata.c    # static Unicode character database
 

PCbuild/pythoncore.vcxproj

@@ -221,6 +221,7 @@
     <ClCompile Include="..\Modules\_collectionsmodule.c" />
     <ClCompile Include="..\Modules\_csv.c" />
     <ClCompile Include="..\Modules\_functoolsmodule.c" />
+    <ClCompile Include="..\Modules\_futuresmodule.c" />
     <ClCompile Include="..\Modules\_heapqmodule.c" />
     <ClCompile Include="..\Modules\_json.c" />
     <ClCompile Include="..\Modules\_localemodule.c" />

PCbuild/pythoncore.vcxproj.filters

@@ -470,6 +470,9 @@
     <ClCompile Include="..\Modules\_functoolsmodule.c">
       <Filter>Modules</Filter>
     </ClCompile>
+    <ClCompile Include="..\Modules\_futuresmodule.c">
+      <Filter>Modules</Filter>
+    </ClCompile>
     <ClCompile Include="..\Modules\_heapqmodule.c">
       <Filter>Modules</Filter>
     </ClCompile>

setup.py

@@ -656,6 +656,8 @@ class PyBuildExt(build_ext):
                                depends=['unicodedata_db.h', 'unicodename_db.h']) )
         # _opcode module
         exts.append( Extension('_opcode', ['_opcode.c']) )
+        # Fast asyncio Future implementation
+        exts.append( Extension("_futures", ["_futuresmodule.c"]) )
 
         # Modules with some UNIX dependencies -- on by default:
         # (If you have a really backward UNIX, select and socket may not be