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gh-159603: Call pthread_attr_init() in hardware_stack_limits() by vstinner · Pull Request #159857 · python/cpython · GitHub

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gh-159603: Call pthread_attr_init() in hardware_stack_limits() #159857

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Merged
vstinner merged 2 commits into from
Oct 20, 2026
Conversation 2 Commits 2 Checks 56 Files changed
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gh-159603: Call pthread_attr_init() in hardware_stack_limits() #159857

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gh-159603: Call pthread_attr_init() in hardware_stack_limits()
vstinner Oct 20, 2026
8cf4b8f
Emscripten: add pthread_attr_init() workaround
vstinner Oct 20, 2026
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12 changes: 10 additions & 2 deletions Python/ceval.c
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Original file line number Diff line number Diff line change
Expand Up @@ -79,6 +79,7 @@ _Py_ReachedRecursionLimitWithMargin(PyThreadState *tstate, int margin_count)
#include "emscripten/stack.h"

#define pthread_attr_t workaround_pthread_attr_t
#define pthread_attr_init workaround_pthread_attr_init
#define pthread_getattr_np workaround_pthread_getattr_np
#define pthread_attr_getguardsize workaround_pthread_attr_getguardsize
#define pthread_attr_getstack workaround_pthread_attr_getstack
Expand All @@ -91,6 +92,11 @@ typedef struct {

extern __attribute__((__visibility__("hidden"))) unsigned __default_guardsize;

int pthread_attr_init(pthread_attr_t *a)
{
return 0;
}

// Modified version of pthread_getattr_np from the upstream PR.

int pthread_getattr_np(pthread_t thread, pthread_attr_t *attr) {
Expand Down Expand Up @@ -158,11 +164,12 @@ hardware_stack_limits(uintptr_t *base, uintptr_t *top, uintptr_t sp)
size_t stack_size, guard_size;
void *stack_addr;
pthread_attr_t attr;
#ifdef _Py_HAVE_PTHREAD_ATTR_GET_NP

int err = pthread_attr_init(&attr);
#ifdef _Py_HAVE_PTHREAD_ATTR_GET_NP
err |= pthread_attr_get_np(pthread_self(), &attr);
#else
int err = pthread_getattr_np(pthread_self(), &attr);
err |= pthread_getattr_np(pthread_self(), &attr);
#endif
if (err == 0) {
err = pthread_attr_getguardsize(&attr, &guard_size);
Expand All @@ -175,6 +182,7 @@ hardware_stack_limits(uintptr_t *base, uintptr_t *top, uintptr_t sp)
return;
}
# endif

// Add some space for caller function then round to minimum page size
// This is a guess at the top of the stack, but should be a reasonably
// good guess if called from _PyThreadState_Attach when creating a thread.
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