Issue #7544: Preallocate thread memory before creating the thread to avoid a

fatal error in low memory condition.

1 files changed, 23 insertions, 5 deletions

diff --git a/Python/pystate.c b/Python/pystate.c
index da417c1032..343a97b00d 100644
--- a/Python/pystate.c
+++ b/Python/pystate.c
@@ -154,8 +154,8 @@ threadstate_getframe(PyThreadState *self)
 	return self->frame;
 }
 
-PyThreadState *
-PyThreadState_New(PyInterpreterState *interp)
+static PyThreadState *
+new_threadstate(PyInterpreterState *interp, int init)
 {
 	PyThreadState *tstate = (PyThreadState *)malloc(sizeof(PyThreadState));
 
@@ -193,9 +193,8 @@ PyThreadState_New(PyInterpreterState *interp)
 		tstate->c_profileobj = NULL;
 		tstate->c_traceobj = NULL;
 
-#ifdef WITH_THREAD
-		_PyGILState_NoteThreadState(tstate);
-#endif
+		if (init)
+			_PyThreadState_Init(tstate);
 
 		HEAD_LOCK();
 		tstate->next = interp->tstate_head;
@@ -206,6 +205,25 @@ PyThreadState_New(PyInterpreterState *interp)
 	return tstate;
 }
 
+PyThreadState *
+PyThreadState_New(PyInterpreterState *interp)
+{
+	return new_threadstate(interp, 1);
+}
+
+PyThreadState *
+_PyThreadState_Prealloc(PyInterpreterState *interp)
+{
+	return new_threadstate(interp, 0);
+}
+
+void
+_PyThreadState_Init(PyThreadState *tstate)
+{
+#ifdef WITH_THREAD
+	_PyGILState_NoteThreadState(tstate);
+#endif
+}
 
 void
 PyThreadState_Clear(PyThreadState *tstate)