# thread_local

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< c‎ | thread

Defined in header ``<threads.h>`` |  |
#define thread_local _Thread_local |  | (since C11) (removed in C23)

Convenience macro which can be used to specify that an object has thread-local storage duration.

### Notes

Since C23, `thread_local` is itself a keyword, which may also be a predefined macro, so `<threads.h>` no longer provides it.

### References

- C17 standard (ISO/IEC 9899:2018):

  - 7.26.1/3 thread_local (p: 274)

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

  - 7.26.1/3 thread_local (p: 376)

### See also

C++ documentation for thread_local

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