# 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)

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