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gh-139231: Fix estimation of available stack size for recursion limit on macOS (GH-139232)

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Use `pthread_get_stackaddr_np()` and `pthread_get_stacksize_np()` to determine the stack address and size.
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Rok Mandeljc 2025-09-24 12:57:00 +02:00 • committed by GitHub
parent a5e0562350
commit 7016044de9
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1 changed files with 7 additions and 0 deletions
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Python/ceval.c
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@ -451,6 +451,13 @@ _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