# std::cv_status

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< cpp‎ | thread

Defined in header `<condition_variable>` |  |
enum class cv_status { no_timeout, timeout }; |  | (since C++11)

The scoped enumeration `std::cv_status` describes whether a timed wait returned because of timeout or not.

`std::cv_status` is used by the `wait_for` and `wait_until` methods of std::condition_variable and std::condition_variable_any.

### Member constants

Constant | Explanation
`no_timeout` | the condition variable was awakened with `notify_all`, `notify_one`, or spuriously
`timeout` | the condition variable was awakened by timeout expiration

### See also

wait_for | blocks the current thread until the condition variable is woken up or after the specified timeout duration (public member function of `std::condition_variable`)
wait_for | blocks the current thread until the condition variable is woken up or after the specified timeout duration (public member function of `std::condition_variable_any`)
wait_until | blocks the current thread until the condition variable is woken up or until specified time point has been reached (public member function of `std::condition_variable`)
wait_until | blocks the current thread until the condition variable is woken up or until specified time point has been reached (public member function of `std::condition_variable_any`)

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