You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
116 lines
3.5 KiB
116 lines
3.5 KiB
.\"
|
|
.\" Copyright 2012-2013 Samy Al Bahra.
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\"
|
|
.Dd April 20, 2013
|
|
.Dt CK_RING_ENQUEUE_SPMC 3
|
|
.Sh NAME
|
|
.Nm ck_ring_enqueue_spmc
|
|
.Nd enqueue pointer into bounded FIFO
|
|
.Sh LIBRARY
|
|
Concurrency Kit (libck, \-lck)
|
|
.Sh SYNOPSIS
|
|
.In ck_ring.h
|
|
.Ft bool
|
|
.Fn ck_ring_enqueue_spmc "ck_ring_t *ring" "ck_ring_buffer_t *buffer" "void *entry"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn ck_ring_enqueue_spmc 3
|
|
function enqueues the pointer
|
|
.Fa entry
|
|
into the bounded buffer pointed to by
|
|
.Fa ring
|
|
in FIFO fashion.
|
|
The buffer pointed to by
|
|
.Fa buffer
|
|
must be unique to
|
|
.Fa ring
|
|
and point to an array of ck_ring_buffer_t of sufficient
|
|
length (according to the power-of-2 elements in the buffer).
|
|
The decoupling of the ring from the buffer serves
|
|
to address use-cases involving multiple address spaces
|
|
and DMA, among others.
|
|
If you are on non-POSIX platforms or wish for strict
|
|
compliance with C, then it is recommended to pass a
|
|
pointer of type void ** for
|
|
.Fa entry .
|
|
This function is safe to call without locking for UINT_MAX
|
|
concurrent invocations of
|
|
.Fn ck_ring_dequeue_spmc 3
|
|
or
|
|
.Fn ck_ring_trydequeue_spmc 3 .
|
|
This function provides wait-free progress
|
|
guarantees for one active invocation.
|
|
.Sh EXAMPLE
|
|
.Bd -literal -offset indent
|
|
#include <ck_ring.h>
|
|
|
|
/* This ring was previously initialized with ck_ring_init. */
|
|
ck_ring_t ring;
|
|
|
|
/* The ring was initialized for 1023 elements. */
|
|
ck_ring_buffer_t buffer[1024];
|
|
|
|
void
|
|
enqueue(void)
|
|
{
|
|
void *entry = some_object;
|
|
|
|
/* Attempt to enqueue pointer to some_object into buffer. */
|
|
if (ck_ring_enqueue_spmc(&ring, &buffer, &entry) == false) {
|
|
/*
|
|
* The buffer was full and the enqueue operation
|
|
* has failed.
|
|
*/
|
|
return;
|
|
}
|
|
|
|
/* Enqueue operation completed successfully. */
|
|
return;
|
|
}
|
|
.Ed
|
|
.Sh RETURN VALUES
|
|
The function returns true if the value of
|
|
.Fa entry
|
|
was successfully enqueued into
|
|
.Fa ring .
|
|
The function will return false if the value of
|
|
.Fa entry
|
|
could not be enqueued which only occurs if
|
|
.Fa ring
|
|
was full.
|
|
.Sh SEE ALSO
|
|
.Xr ck_ring_init 3 ,
|
|
.Xr ck_ring_dequeue_spmc 3 ,
|
|
.Xr ck_ring_trydequeue_spmc 3 ,
|
|
.Xr ck_ring_enqueue_spmc_size 3 ,
|
|
.Xr ck_ring_dequeue_spsc 3 ,
|
|
.Xr ck_ring_enqueue_spsc 3 ,
|
|
.Xr ck_ring_enqueue_spsc_size 3 ,
|
|
.Xr ck_ring_capacity 3 ,
|
|
.Xr ck_ring_size 3
|
|
.Pp
|
|
Additional information available at http://concurrencykit.org/
|