eventfd_ctx_remove_wait_queue man page on Oracle

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EVENTFD_CTX_REMOVE_W(9) Events based on file descripto EVENTFD_CTX_REMOVE_W(9)

NAME
       eventfd_ctx_remove_wait_queue - Read the current counter and removes
       wait queue.

SYNOPSIS
       int eventfd_ctx_remove_wait_queue(struct eventfd_ctx * ctx,
					 wait_queue_t * wait, __u64 * cnt);

ARGUMENTS
       ctx
	   [in] Pointer to eventfd context.

       wait
	   [in] Wait queue to be removed.

       cnt
	   [out] Pointer to the 64-bit counter value.

DESCRIPTION
       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.

COPYRIGHT
Kernel Hackers Manual 3.8.	   June 2014	       EVENTFD_CTX_REMOVE_W(9)
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