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Most mutable data is protected by a striped lock that is keyed on the referenced object's address. The weakref's hash is protected using the weakref's per-object lock. Note that this only affects free-threaded builds. Apart from some minor refactoring, the added code is all either gated by `ifdef`s or is a no-op (e.g. `Py_BEGIN_CRITICAL_SECTION`).
48 lines
1.9 KiB
C
48 lines
1.9 KiB
C
// This header file provides wrappers around the atomic operations found in
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// `pyatomic.h` that are only atomic in free-threaded builds.
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//
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// These are intended to be used in places where atomics are required in
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// free-threaded builds, but not in the default build, and we don't want to
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// introduce the potential performance overhead of an atomic operation in the
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// default build.
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//
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// All usages of these macros should be replaced with unconditionally atomic or
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// non-atomic versions, and this file should be removed, once the dust settles
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// on free threading.
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#ifndef Py_ATOMIC_FT_WRAPPERS_H
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#define Py_ATOMIC_FT_WRAPPERS_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef Py_BUILD_CORE
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#error "this header requires Py_BUILD_CORE define"
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#endif
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#ifdef Py_GIL_DISABLED
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#define FT_ATOMIC_LOAD_PTR(value) _Py_atomic_load_ptr(&value)
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#define FT_ATOMIC_LOAD_SSIZE(value) _Py_atomic_load_ssize(&value)
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#define FT_ATOMIC_LOAD_SSIZE_RELAXED(value) \
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_Py_atomic_load_ssize_relaxed(&value)
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#define FT_ATOMIC_STORE_PTR(value, new_value) \
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_Py_atomic_store_ptr(&value, new_value)
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#define FT_ATOMIC_STORE_PTR_RELAXED(value, new_value) \
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_Py_atomic_store_ptr_relaxed(&value, new_value)
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#define FT_ATOMIC_STORE_PTR_RELEASE(value, new_value) \
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_Py_atomic_store_ptr_release(&value, new_value)
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#define FT_ATOMIC_STORE_SSIZE_RELAXED(value, new_value) \
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_Py_atomic_store_ssize_relaxed(&value, new_value)
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#else
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#define FT_ATOMIC_LOAD_PTR(value) value
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#define FT_ATOMIC_LOAD_SSIZE(value) value
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#define FT_ATOMIC_LOAD_SSIZE_RELAXED(value) value
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#define FT_ATOMIC_STORE_PTR(value, new_value) value = new_value
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#define FT_ATOMIC_STORE_PTR_RELAXED(value, new_value) value = new_value
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#define FT_ATOMIC_STORE_PTR_RELEASE(value, new_value) value = new_value
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#define FT_ATOMIC_STORE_SSIZE_RELAXED(value, new_value) value = new_value
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* !Py_ATOMIC_FT_WRAPPERS_H */
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