linux/include/drm/spsc_queue.h

/*
 * Copyright 2017 Advanced Micro Devices, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 */

#ifndef DRM_SCHEDULER_SPSC_QUEUE_H_
#define DRM_SCHEDULER_SPSC_QUEUE_H_

#include <linux/atomic.h>
#include <linux/preempt.h>

/** SPSC lockless queue */

struct spsc_node { … };

struct spsc_queue { … };

static inline void spsc_queue_init(struct spsc_queue *queue)
{ … }

static inline struct spsc_node *spsc_queue_peek(struct spsc_queue *queue)
{ … }

static inline int spsc_queue_count(struct spsc_queue *queue)
{ … }

static inline bool spsc_queue_push(struct spsc_queue *queue, struct spsc_node *node)
{ … }


static inline struct spsc_node *spsc_queue_pop(struct spsc_queue *queue)
{ … }



#endif /* DRM_SCHEDULER_SPSC_QUEUE_H_ */