| Defined in header <stdatomic.h> | ||
|---|---|---|
#define ATOMIC_BOOL_LOCK_FREE /* implementation-defined */ #define ATOMIC_CHAR_LOCK_FREE /* implementation-defined */ #define ATOMIC_CHAR16_T_LOCK_FREE /* implementation-defined */ #define ATOMIC_CHAR32_T_LOCK_FREE /* implementation-defined */ #define ATOMIC_WCHAR_T_LOCK_FREE /* implementation-defined */ #define ATOMIC_SHORT_LOCK_FREE /* implementation-defined */ #define ATOMIC_INT_LOCK_FREE /* implementation-defined */ #define ATOMIC_LONG_LOCK_FREE /* implementation-defined */ #define ATOMIC_LLONG_LOCK_FREE /* implementation-defined */ #define ATOMIC_POINTER_LOCK_FREE /* implementation-defined */ | (since C11) |
Expands to preprocessor constant expressions that evaluate to either 0, 1, or 2 which indicate the lock-free property of the corresponding atomic types (both signed and unsigned).
| Value | Explanation |
|---|---|
0 | The atomic type is never lock-free |
1 | The atomic type is sometimes lock-free |
2 | The atomic type is always lock-free |
References
- C11 standard (ISO/IEC 9899:2011):
- 7.17.1/3 atomic lock-free macros (p: 273)
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