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

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---------

Co-authored-by: Sam Gross <colesbury@gmail.com>
This commit is contained in:
Donghee Na 2023-12-18 16:54:49 +00:00 committed by GitHub
parent 59f0766ae5
commit d00dbf5415
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2 changed files with 19 additions and 1 deletions
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6
Include/object.h
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@ -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)
{
@ -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;
}

14
Python/pystate.c
View file

@ -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 */