Stowage/cpython
2
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2026-01-06 15:32:22 +00:00
Code Issues Projects Releases Packages Wiki Activity

gh-114271: Make thread._rlock thread-safe in free-threaded builds (#115102)

Browse source 
The ID of the owning thread (`rlock_owner`) may be accessed by
multiple threads without holding the underlying lock; relaxed
atomics are used in place of the previous loads/stores.

The number of times that the lock has been acquired (`rlock_count`)
is only ever accessed by the thread that holds the lock; we do not
need to use atomics to access it.
This commit is contained in:
mpage 2024-02-16 10:29:25 -08:00 • committed by GitHub
parent 13addd2bbd
commit f366e21504
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
5 changed files with 68 additions and 10 deletions
Download patch file Download diff file Expand all files Collapse all files

6
Include/cpython/pyatomic.h
View file

@ -360,6 +360,8 @@ _Py_atomic_load_ssize_relaxed(const Py_ssize_t *obj);
static inline void *
_Py_atomic_load_ptr_relaxed(const void *obj);
static inline unsigned long long
_Py_atomic_load_ullong_relaxed(const unsigned long long *obj);
// --- _Py_atomic_store ------------------------------------------------------
// Atomically performs `*obj = value` (sequential consistency)
@ -452,6 +454,10 @@ _Py_atomic_store_ptr_relaxed(void *obj, void *value);
static inline void
_Py_atomic_store_ssize_relaxed(Py_ssize_t *obj, Py_ssize_t value);
static inline void
_Py_atomic_store_ullong_relaxed(unsigned long long *obj,
unsigned long long value);
// --- _Py_atomic_load_ptr_acquire / _Py_atomic_store_ptr_release ------------