# atomic_flag

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< c‎ | atomic

Defined in header `<stdatomic.h>` |  |
struct atomic_flag; |  | (since C11)

atomic_flag is an atomic boolean type. Unlike other atomic types, it is guaranteed to be lock-free. Unlike atomic_bool, `atomic_flag` does not provide load or store operations.

### References

- C11 standard (ISO/IEC 9899:2011):

  - 7.17.1/4 atomic_flag (p: 273)

  - 7.17.8 Atomic flag type and operations (p: 285-286)

### See also

ATOMIC_FLAG_INIT (C11) | initializes a new atomic_flag (macro constant)
atomic_flag_test_and_set atomic_flag_test_and_set_explicit (C11) | sets an atomic_flag to true and returns the old value (function)
atomic_flag_clear atomic_flag_clear_explicit (C11) | sets an atomic_flag to false (function)

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