From 6d2e3a9e8d5ca1e735301824fd2a7136db9eeb81 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tom=C3=A1=C5=A1=20Hrn=C4=8Diar?= <thrnciar@redhat.com>
Date: Fri, 17 Mar 2023 11:59:10 +0100
Subject: [PATCH] Rename recursion limits to add compatibility with Python 3.12

---
 src/greenlet/greenlet.c | 19 ++++++++++++++++---
 src/greenlet/greenlet.h |  6 ++++++
 2 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/src/greenlet/greenlet.c b/src/greenlet/greenlet.c
index 2f3ad6e..6165064 100644
--- a/src/greenlet/greenlet.c
+++ b/src/greenlet/greenlet.c
@@ -527,7 +527,10 @@ g_switchstack(void)
     { /* save state */
         PyGreenlet* current = ts_current;
         PyThreadState* tstate = PyThreadState_GET();
-#if GREENLET_PY311
+#if GREENLET_PY312
+        current->recursion_depth = (tstate->py_recursion_limit
+                                    - tstate->py_recursion_remaining);
+#elif GREENLET_PY311
         current->recursion_depth = (tstate->recursion_limit
                                     - tstate->recursion_remaining);
 #else
@@ -620,7 +623,14 @@ g_switchstack(void)
         */
         tstate->cframe->use_tracing = ts__g_switchstack_use_tracing;
 #endif
-#if GREENLET_PY311
+#if GREENLET_PY312
+        tstate->py_recursion_remaining = (tstate->py_recursion_limit
+                                       - target->recursion_depth);
+        tstate->cframe->current_frame = target->current_frame;
+        tstate->datastack_chunk = target->datastack_chunk;
+        tstate->datastack_top = target->datastack_top;
+        tstate->datastack_limit = target->datastack_limit;
+#elif GREENLET_PY311
         tstate->recursion_remaining = (tstate->recursion_limit
                                        - target->recursion_depth);
         tstate->cframe->current_frame = target->current_frame;
@@ -899,7 +909,10 @@ static int GREENLET_NOINLINE(g_initialstub)(void* mark)
     }
     self->top_frame = NULL;
     green_clear_exc(self);
-#if GREENLET_PY311
+#if GREENLET_PY312
+    self->recursion_depth = (PyThreadState_GET()->py_recursion_limit
+                             - PyThreadState_GET()->py_recursion_remaining);
+#elif GREENLET_PY311
     self->recursion_depth = (PyThreadState_GET()->recursion_limit
                              - PyThreadState_GET()->recursion_remaining);
 #else
diff --git a/src/greenlet/greenlet.h b/src/greenlet/greenlet.h
index c788b2f..e20c580 100644
--- a/src/greenlet/greenlet.h
+++ b/src/greenlet/greenlet.h
@@ -23,6 +23,12 @@ extern "C" {
 #  define _PyCFrame CFrame
 #endif
 
+#if PY_VERSION_HEX >= 0x30C00A6
+#  define GREENLET_PY312 1
+#else
+#  define GREENLET_PY312 0
+#endif
+
 typedef struct _greenlet {
     PyObject_HEAD
     char* stack_start;
-- 
2.38.1