try_wait_for_completion(9) [centos man page]

TRY_WAIT_FOR_COMPLET(9) 					   Driver Basics					   TRY_WAIT_FOR_COMPLET(9)

NAME

       try_wait_for_completion - try to decrement a completion without blocking

SYNOPSIS

       bool try_wait_for_completion(struct completion * x);

ARGUMENTS

       x
	   completion structure

RETURN

       0 if a decrement cannot be done without blocking 1 if a decrement succeeded.

       If a completion is being used as a counting completion, attempt to decrement the counter without blocking. This enables us to avoid waiting
       if the resource the completion is protecting is not available.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014						   TRY_WAIT_FOR_COMPLET(9)

IBV_CREATE_COMP_CHANNEL(3)				  Libibverbs Programmer's Manual				IBV_CREATE_COMP_CHANNEL(3)

NAME

       ibv_create_comp_channel, ibv_destroy_comp_channel - create or destroy a completion event channel

SYNOPSIS

       #include <infiniband/verbs.h>

       struct ibv_comp_channel *ibv_create_comp_channel(struct ibv_context
							*context);

       int ibv_destroy_comp_channel(struct ibv_comp_channel *channel);

DESCRIPTION

       ibv_create_comp_channel() creates a completion event channel for the RDMA device context context.

       ibv_destroy_comp_channel() destroys the completion event channel channel.

RETURN VALUE

       ibv_create_comp_channel() returns a pointer to the created completion event channel, or NULL if the request fails.

       ibv_destroy_comp_channel() returns 0 on success, or the value of errno on failure (which indicates the failure reason).

NOTES

       A "completion channel" is an abstraction introduced by libibverbs that does not exist in the InfiniBand Architecture verbs specification or
       RDMA Protocol Verbs Specification.  A completion channel is essentially file descriptor that is used to deliver completion notifications to
       a  userspace  process.  When a completion event is generated for a completion queue (CQ), the event is delivered via the completion channel
       attached to that CQ.  This may be useful to steer completion events to different threads by using multiple completion channels.

       ibv_destroy_comp_channel() fails if any CQs are still associated with the completion event channel being destroyed.

SEE ALSO

       ibv_open_device(3), ibv_create_cq(3), ibv_get_cq_event(3)

AUTHORS

       Dotan Barak <dotanba@gmail.com>

libibverbs							    2006-10-31						IBV_CREATE_COMP_CHANNEL(3)