# ATOMIC_FLAG_INIT

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< c‎ | atomic

Defined in header `<stdatomic.h>` |  |
#define ATOMIC_FLAG_INIT /* unspecified */ |  | (since C11)

Expands to an expression that can be used to initialize atomic_flag type. The value `atomic_flag` that is not initialized using this macro is undefined.

### Example

Run this code

    #include <stdatomic.h>

    atomic_flag flag = ATOMIC_FLAG_INIT;

### References

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

  - 7.17.1/3 ATOMIC_FLAG_INIT (p: 273)

  - 7.17.8/4 ATOMIC_FLAG_INIT (p: 285)

### See also

ATOMIC_VAR_INIT (C11)(deprecated in C17) | initializes a new atomic object (function macro)
atomic_flag (C11) | lock-free atomic boolean flag (struct)

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