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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

struct eventfd_ctx * ctx

[in] Pointer to eventfd context.

wait_queue_t * wait

[in] Wait queue to be removed.

__u64 * 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

September 2017 Kernel Hackers Manual 4.12