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gh-139231: Fix estimation of available stack size for recursion limit on macOS by rokm · Pull Request #139232 · python/cpython · GitHub

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

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Merged
markshannon merged 1 commit into from
Sep 24, 2025
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gh-139231: Fix estimation of available stack size for recursion limit on macOS #139232

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7 changes: 7 additions & 0 deletions Python/ceval.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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__)
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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
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