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gh-112535: Implement fallback implementation of _Py_ThreadId() #113185

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Merged
merged 4 commits into from
Dec 18, 2023
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gh-112535: Implement fallback implementation of _Py_ThreadId() #113185

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1b16137
gh-112535: Implement fallback implementation of _Py_ThreadId()
corona10 Dec 15, 2023
8cb8f27
Rename
corona10 Dec 15, 2023
05cac38
Apply suggestions from code review
corona10 Dec 18, 2023
a1551d3
Address code review
corona10 Dec 18, 2023
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6 changes: 5 additions & 1 deletion Include/object.h
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Original file line number Diff line number Diff line change
Expand Up @@ -239,6 +239,8 @@ PyAPI_FUNC(int) Py_Is(PyObject *x, PyObject *y);
#define Py_Is(x, y) ((x) == (y))

#if defined(Py_GIL_DISABLED) && !defined(Py_LIMITED_API)
PyAPI_FUNC(uintptr_t) _Py_GetThreadLocal_Addr(void);

static inline uintptr_t
_Py_ThreadId(void)
{
Expand Down Expand Up @@ -291,7 +293,9 @@ _Py_ThreadId(void)
__asm__ ("mv %0, tp" : "=r" (tid));
#endif
#else
# error "define _Py_ThreadId for this platform"
// Fallback to a portable implementation if we do not have a faster
// platform-specific implementation.
tid = _Py_GetThreadLocal_Addr();
#endif
return tid;
}
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14 changes: 14 additions & 0 deletions Python/pystate.c
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Expand Up @@ -1951,6 +1951,20 @@ _PyThreadState_Bind(PyThreadState *tstate)
}
}

#if defined(Py_GIL_DISABLED) && !defined(Py_LIMITED_API)
uintptr_t
_Py_GetThreadLocal_Addr(void)
{
#ifdef HAVE_THREAD_LOCAL
// gh-112535: Use the address of the thread-local PyThreadState variable as
// a unique identifier for the current thread. Each thread has a unique
// _Py_tss_tstate variable with a unique address.
return (uintptr_t)&_Py_tss_tstate;
#else
# error "no supported thread-local variable storage classifier"
#endif
}
#endif

/***********************************/
/* routines for advanced debuggers */
Expand Down