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cpython/Include/internal/pycore_pyatomic_ft_wrappers.h

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gh-115041: Add wrappers that are atomic only in free-threaded builds (#115046) These are intended to be used in places where atomics are required in free-threaded builds but not in the default build. We don't want to introduce the potential performance overhead of an atomic operation in the default build.
2024-02-14 12:15:05 -08:00
// This header file provides wrappers around the atomic operations found in
// `pyatomic.h` that are only atomic in free-threaded builds.
//
// These are intended to be used in places where atomics are required in
// free-threaded builds, but not in the default build, and we don't want to
// introduce the potential performance overhead of an atomic operation in the
// default build.
//
// All usages of these macros should be replaced with unconditionally atomic or
// non-atomic versions, and this file should be removed, once the dust settles
// on free threading.
#ifndef Py_ATOMIC_FT_WRAPPERS_H
#define Py_ATOMIC_FT_WRAPPERS_H
#ifdef __cplusplus
extern "C" {
#endif
#ifndef Py_BUILD_CORE
#error "this header requires Py_BUILD_CORE define"
#endif
#ifdef Py_GIL_DISABLED
gh-112050: Make collections.deque thread-safe in free-threaded builds (#113830) Use critical sections to make deque methods that operate on mutable state thread-safe when the GIL is disabled. This is mostly accomplished by using the @critical_section Argument Clinic directive, though there are a few places where this was not possible and critical sections had to be manually acquired/released.
2024-02-15 00:22:47 -08:00
#define FT_ATOMIC_LOAD_SSIZE(value) _Py_atomic_load_ssize(&value)
gh-115041: Add wrappers that are atomic only in free-threaded builds (#115046) These are intended to be used in places where atomics are required in free-threaded builds but not in the default build. We don't want to introduce the potential performance overhead of an atomic operation in the default build.
2024-02-14 12:15:05 -08:00
#define FT_ATOMIC_LOAD_SSIZE_RELAXED(value) \
_Py_atomic_load_ssize_relaxed(&value)
gh-112087: Make list_{concat, repeat, inplace_repeat, ass_item) to be thread-safe (gh-115605)
2024-02-21 10:38:09 +09:00
#define FT_ATOMIC_STORE_PTR_RELAXED(value, new_value) \
_Py_atomic_store_ptr_relaxed(&value, new_value)
#define FT_ATOMIC_STORE_PTR_RELEASE(value, new_value) \
_Py_atomic_store_ptr_release(&value, new_value)
gh-115041: Add wrappers that are atomic only in free-threaded builds (#115046) These are intended to be used in places where atomics are required in free-threaded builds but not in the default build. We don't want to introduce the potential performance overhead of an atomic operation in the default build.
2024-02-14 12:15:05 -08:00
#define FT_ATOMIC_STORE_SSIZE_RELAXED(value, new_value) \
_Py_atomic_store_ssize_relaxed(&value, new_value)
#else
gh-112050: Make collections.deque thread-safe in free-threaded builds (#113830) Use critical sections to make deque methods that operate on mutable state thread-safe when the GIL is disabled. This is mostly accomplished by using the @critical_section Argument Clinic directive, though there are a few places where this was not possible and critical sections had to be manually acquired/released.
2024-02-15 00:22:47 -08:00
#define FT_ATOMIC_LOAD_SSIZE(value) value
gh-115041: Add wrappers that are atomic only in free-threaded builds (#115046) These are intended to be used in places where atomics are required in free-threaded builds but not in the default build. We don't want to introduce the potential performance overhead of an atomic operation in the default build.
2024-02-14 12:15:05 -08:00
#define FT_ATOMIC_LOAD_SSIZE_RELAXED(value) value
gh-112087: Make list_{concat, repeat, inplace_repeat, ass_item) to be thread-safe (gh-115605)
2024-02-21 10:38:09 +09:00
#define FT_ATOMIC_STORE_PTR_RELAXED(value, new_value) value = new_value
#define FT_ATOMIC_STORE_PTR_RELEASE(value, new_value) value = new_value
gh-115041: Add wrappers that are atomic only in free-threaded builds (#115046) These are intended to be used in places where atomics are required in free-threaded builds but not in the default build. We don't want to introduce the potential performance overhead of an atomic operation in the default build.
2024-02-14 12:15:05 -08:00
#define FT_ATOMIC_STORE_SSIZE_RELAXED(value, new_value) value = new_value
#endif
#ifdef __cplusplus
}
#endif
#endif /* !Py_ATOMIC_FT_WRAPPERS_H */
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