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Showing content from https://en.cppreference.com/w/cpp/algorithm/../../cpp/../cpp/../c/thread/cnd_timedwait.html below:

cnd_timedwait - cppreference.com

int cnd_timedwait( cnd_t* restrict cond, mtx_t* restrict mutex,
                   const struct timespec* restrict time_point ); (since C11)

Atomically unlocks the mutex pointed to by mutex and blocks on the condition variable pointed to by cond until the thread is signalled by cnd_signal or cnd_broadcast, or until the TIME_UTC based time point pointed to by time_point has been reached, or until a spurious wake-up occurs. The mutex is locked again before the function returns.

The behavior is undefined if the mutex is not already locked by the calling thread.

[edit] Parameters cond - pointer to the condition variable to block on mutex - pointer to the mutex to unlock for the duration of the block time_point - pointer to an object specifying timeout time to wait until [edit] Return value

thrd_success if successful, thrd_timedout if the timeout time has been reached before the mutex is locked, or thrd_error if an error occurred.

[edit] References
[edit] See also

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