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-.Dd April 20, 2013
-.Dt CK_RING_DEQUEUE_SPMC 3
-.Sh NAME
-.Nm ck_ring_dequeue_spmc
-.Nd dequeue pointer from bounded FIFO
-.Sh LIBRARY
-Concurrency Kit (libck, \-lck)
-.Sh SYNOPSIS
-.In ck_ring.h
-.Ft bool
-.Fn ck_ring_dequeue_spmc "ck_ring_t *ring" "ck_ring_buffer_t *buffer" "void *result"
-.Sh DESCRIPTION
-The
-.Fn ck_ring_dequeue_spmc 3
-function dequeues a pointer from the bounded buffer
-pointed to by
-.Fa ring
-in FIFO fashion. The pointer is stored in the pointer
-pointed to by
-.Fa result .
-The buffer pointed to by
-.Fa buffer
-must be unique to
-.Fa ring .
-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 result .
-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
-and up to one concurrent
-.Fn ck_ring_enqueue_spmc 3
-or
-.Fn ck_ring_tryenqueue_spmc 3
-invocation. This function provides lock-free progress
-guarantees.
-.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
-dequeue(void)
-{
-	void *result;
-
-	/* Dequeue from ring until it is empty. */
-	while (ck_ring_dequeue_spmc(&ring, &buffer, &result) == true) {
-		/*
-		 * Results contains the oldest pointer in ring
-		 * since the dequeue operation returned true.
-		 */
-		operation(result);
-	}
-
-	/* An empty ring was encountered, leave. */
-	return;
-}
-.Ed
-.Sh RETURN VALUES
-The function returns true if the buffer was non-empty.
-The result of the dequeue operation is stored in the
-value pointed to by
-.Fa result .
-The function will return false if the buffer was empty
-and the value in
-.Fa result
-will be undefined.
-.Sh SEE ALSO
-.Xr ck_ring_init 3 ,
-.Xr ck_ring_trydequeue_spmc 3 ,
-.Xr ck_ring_enqueue_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/