std::atomic_ref<T>::is_lock_free
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C++
Concurrency support library
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std::atomic_ref
| Member functions | ||||
atomic_ref::is_lock_free | ||||
(C++26) | ||||
| Operations for arithmetic types (except bool and pointer-to-object) | ||||
| Operations for integral types (except bool and pointer-to-object) | ||||
(C++26) | ||||
(C++26) | ||||
| Operations for integral types (except bool) | ||||
| Constants | ||||
| bool is_lock_free() const noexcept; |
(since C++20) | |
Checks whether the atomic operations on this object are lock-free.
Contents |
[edit] Parameters
(none)
[edit] Return value
true if the atomic operations on this object are lock-free, false otherwise.
[edit] Notes
All atomic types except for std::atomic_flag may be implemented using mutexes or other locking operations, rather than using the lock-free atomic CPU instructions. Atomic types are also allowed to be sometimes lock-free, e.g. if only aligned memory accesses are naturally atomic on a given architecture, misaligned objects of the same type have to use locks.
The C++ standard recommends (but does not require) that lock-free atomic operations are also address-free, that is, suitable for communication between processes using shared memory.
[edit] Example
| This section is incomplete Reason: no example |
[edit] See also
| [static] |
indicates that the type is always lock-free (public static member constant) [edit] |
