From 9914c15d0eada49050856298cd423f8b97934d70 Mon Sep 17 00:00:00 2001 From: Rok Mandeljc Date: Wed, 24 Sep 2025 12:57:00 +0200 Subject: [PATCH] gh-139231: Fix estimation of available stack size for recursion limit on macOS (GH-139232) Use `pthread_get_stackaddr_np()` and `pthread_get_stacksize_np()` to determine the stack address and size. (cherry picked from commit 7016044de919fa2f14f7c0e0d15ac076b00f16a0) Co-authored-by: Rok Mandeljc --- Python/ceval.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/Python/ceval.c b/Python/ceval.c index e5b1b82e45e14c..1ff17f3af56f33 100644 --- a/Python/ceval.c +++ b/Python/ceval.c @@ -437,6 +437,13 @@ _Py_InitializeRecursionLimits(PyThreadState *tstate) SetThreadStackGuarantee(&guarantee); _tstate->c_stack_hard_limit = ((uintptr_t)low) + guarantee + _PyOS_STACK_MARGIN_BYTES; _tstate->c_stack_soft_limit = _tstate->c_stack_hard_limit + _PyOS_STACK_MARGIN_BYTES; +#elif defined(__APPLE__) + pthread_t this_thread = pthread_self(); + void *stack_addr = pthread_get_stackaddr_np(this_thread); // top of the stack + size_t stack_size = pthread_get_stacksize_np(this_thread); + _tstate->c_stack_top = (uintptr_t)stack_addr; + _tstate->c_stack_hard_limit = _tstate->c_stack_top - stack_size; + _tstate->c_stack_soft_limit = _tstate->c_stack_hard_limit + _PyOS_STACK_MARGIN_BYTES; #else uintptr_t here_addr = _Py_get_machine_stack_pointer(); /// XXX musl supports HAVE_PTHRED_GETATTR_NP, but the resulting stack size