|EVENTFD_CTX_REMOVE_W(9)||Events based on file descripto||EVENTFD_CTX_REMOVE_W(9)|
eventfd_ctx_remove_wait_queue - Read the current counter and removes wait queue.
int eventfd_ctx_remove_wait_queue(struct eventfd_ctx * ctx, wait_queue_t * wait, __u64 * cnt);
Returns 0 if successful, or the following error codes:
-EAGAIN : The operation would have blocked.
This is used to atomically remove a wait queue entry from the eventfd wait queue head, and read/reset the counter value.
|January 2017||Kernel Hackers Manual 4.8.|