1 files changed, 33 insertions, 0 deletions
diff --git a/Include/internal/pycore_ceval.h b/Include/internal/pycore_ceval.h
index 23d0fa399d7..48fee697324 100644
--- a/Include/internal/pycore_ceval.h
+++ b/Include/internal/pycore_ceval.h
@@ -193,6 +193,39 @@ int _PyEval_UnpackIterable(PyThreadState *tstate, PyObject *v, int argcnt, int a
 void _PyEval_FrameClearAndPop(PyThreadState *tstate, _PyInterpreterFrame *frame);
 
 
+#define _PY_GIL_DROP_REQUEST_BIT 0
+#define _PY_SIGNALS_PENDING_BIT 1
+#define _PY_CALLS_TO_DO_BIT 2
+#define _PY_ASYNC_EXCEPTION_BIT 3
+#define _PY_GC_SCHEDULED_BIT 4
+
+/* Reserve a few bits for future use */
+#define _PY_EVAL_EVENTS_BITS 8
+#define _PY_EVAL_EVENTS_MASK ((1 << _PY_EVAL_EVENTS_BITS)-1)
+
+static inline void
+_Py_set_eval_breaker_bit(PyInterpreterState *interp, uint32_t bit, uint32_t set)
+{
+    assert(set == 0 || set == 1);
+    uintptr_t to_set = set << bit;
+    uintptr_t mask = ((uintptr_t)1) << bit;
+    uintptr_t old = _Py_atomic_load_uintptr(&interp->ceval.eval_breaker);
+    if ((old & mask) == to_set) {
+        return;
+    }
+    uintptr_t new;
+    do {
+        new = (old & ~mask) | to_set;
+    } while (!_Py_atomic_compare_exchange_uintptr(&interp->ceval.eval_breaker, &old, new));
+}
+
+static inline bool
+_Py_eval_breaker_bit_is_set(PyInterpreterState *interp, int32_t bit)
+{
+    return _Py_atomic_load_uintptr_relaxed(&interp->ceval.eval_breaker) & (((uintptr_t)1) << bit);
+}
+
+
 #ifdef __cplusplus
 }
 #endif