ATOMIC_*_LOCK_FREE

From cppreference.com
C
Concurrency support library
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)
#define ATOMIC_CHAR8_T_LOCK_FREE  /* implementation-defined */
(since C23)

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

  • C17 standard (ISO/IEC 9899:2018):
  • 7.17.1/3 atomic lock-free macros (p: 200)
  • C11 standard (ISO/IEC 9899:2011):
  • 7.17.1/3 atomic lock-free macros (p: 273)
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