Update the greenlet header to match 1.1.0 for 3.10

CHANGES.rst

@@ -138,6 +138,7 @@ Features
   Reported by Suhail Muhammed.
   See :issue:`1678`.
 
+- Drop support for Python 3.5.
 
 Bugfixes
 --------

deps/greenlet/greenlet.h

@@ -38,6 +38,9 @@ typedef struct _greenlet {
 #if PY_VERSION_HEX >= 0x030700A3
     PyObject* context;
 #endif
+#if PY_VERSION_HEX >= 0x30A00B1
+    CFrame* cframe;
+#endif
 } PyGreenlet;
 
 #define PyGreenlet_Check(op) PyObject_TypeCheck(op, &PyGreenlet_Type)

docs/changes/1790.feature

+Add support for Python 3.10.
+
+As part of this, the minimum required greenlet version was increased
+to 1.1.0 (on CPython), and the minimum version of Cython needed to
+build gevent from a source checkout is 3.0a9.

docs/install.rst

@@ -19,8 +19,9 @@
 Supported Platforms
 ===================
 
-This version of gevent runs on Python 2.7.9 and up, and Python 3.5, 3.6, 3.7 and
-3.8. gevent requires the `greenlet <https://greenlet.readthedocs.io>`_
+This version of gevent runs on Python 2.7.9 and up, and many versions
+of Python 3 (for exact details, see the classifiers on the PyPI page
+or in ``setup.py``). gevent requires the `greenlet <https://greenlet.readthedocs.io>`_
 library and will install the `cffi`_ library by default on Windows.
 The cffi library will become the default on all platforms in a future
 release of gevent.

setup.py

@@ -199,8 +199,9 @@ greenlet_requires = [
     # Binary compatibility would break if the greenlet struct changes.
     # (Which it did in 0.4.14 for Python 3.7 and again in 0.4.17; with
     # the release of 1.0a1 it began promising ABI stability with SemVer
-    # so we can add an upper bound)
-    'greenlet >= 0.4.17, < 2.0; platform_python_implementation=="CPython"',
+    # so we can add an upper bound).
+    # 1.1.0 is required for 3.10; it has a new ABI, but only on 1.1.0.
+    'greenlet >= 1.1.0, < 2.0; platform_python_implementation=="CPython"',
 ]
 
 # Note that we don't add cffi to install_requires, it's
@@ -441,12 +442,11 @@ def run_setup(ext_modules):
         classifiers=[
             "License :: OSI Approved :: MIT License",
             "Programming Language :: Python :: 2.7",
-            "Programming Language :: Python :: 3.4",
-            "Programming Language :: Python :: 3.5",
             "Programming Language :: Python :: 3.6",
             "Programming Language :: Python :: 3.7",
             "Programming Language :: Python :: 3.8",
             "Programming Language :: Python :: 3.9",
+            "Programming Language :: Python :: 3.10",
             "Programming Language :: Python :: Implementation :: CPython",
             "Programming Language :: Python :: Implementation :: PyPy",
             "Operating System :: MacOS :: MacOS X",
@@ -457,7 +457,7 @@ def run_setup(ext_modules):
             "Intended Audience :: Developers",
             "Development Status :: 4 - Beta"
         ],
-        python_requires=">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*",
+        python_requires=">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5",
         entry_points={
             'gevent.plugins.monkey.will_patch_all': [
                 "signal_os_incompat = gevent.monkey:_subscribe_signal_os",

tox.ini

 [tox]
 envlist =
-    py27,py35,py36,py37,py27-cffi,pypy,pypy3,py27-libuv,lint
+    py27,py36,py37,py38,py39,py310,py27-cffi,pypy,pypy3,py27-libuv,lint
 
 [testenv]
 usedevelop = true