Don't call PyEval_InitThreads() on CPython >= 3.7, where it should always be a

no-op.  It is explicitly deprecated in 3.9.

1 files changed, 5 insertions, 0 deletions

diff --git a/cffi/_embedding.h b/cffi/_embedding.h
index 207d683..456dc52 100644
--- a/cffi/_embedding.h
+++ b/cffi/_embedding.h
@@ -331,15 +331,20 @@ static int _cffi_carefully_make_gil(void)
     /* call Py_InitializeEx() */
     if (!Py_IsInitialized()) {
         _cffi_py_initialize();
+#if PY_VERSION_HEX < 0x03070000
         PyEval_InitThreads();
+#endif
         PyEval_SaveThread();  /* release the GIL */
         /* the returned tstate must be the one that has been stored into the
            autoTLSkey by _PyGILState_Init() called from Py_Initialize(). */
     }
     else {
+#if PY_VERSION_HEX < 0x03070000
+        /* PyEval_InitThreads() is always a no-op from CPython 3.7 */
         PyGILState_STATE state = PyGILState_Ensure();
         PyEval_InitThreads();
         PyGILState_Release(state);
+#endif
     }
 
 #ifdef WITH_THREAD