73 lines
2.2 KiB
C
73 lines
2.2 KiB
C
/*
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* Copyright (c) 2015 iComm-semi Ltd.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef _SSV_DATA_STRUCT_H_
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#define _SSV_DATA_STRUCT_H_
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#include <linux/spinlock_types.h>
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#include <linux/spinlock.h>
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#include <linux/types.h>
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struct ssv6xxx_queue {
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struct list_head queue;
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spinlock_t lock;
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};
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struct ssv6xxx_list_node {
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struct list_head list;
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};
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static inline void ssv6xxx_init_queue(struct ssv6xxx_queue *ssv_queue) {
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INIT_LIST_HEAD(&ssv_queue->queue);
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spin_lock_init(&ssv_queue->lock);
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}
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static inline void ssv6xxx_init_list_node(struct ssv6xxx_list_node *node) {
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INIT_LIST_HEAD(&node->list);
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}
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static inline void ssv6xxx_enqueue_list_node(struct ssv6xxx_list_node *node, struct ssv6xxx_queue *ssv_queue) {
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unsigned long flags;
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spin_lock_irqsave(&ssv_queue->lock, flags);
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list_del_init(&node->list);
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list_add_tail(&node->list, &ssv_queue->queue);
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spin_unlock_irqrestore(&ssv_queue->lock, flags);
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}
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static inline struct ssv6xxx_list_node *ssv6xxx_dequeue_list_node(struct ssv6xxx_queue *ssv_queue) {
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unsigned long flags;
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struct ssv6xxx_list_node *ssv_list_node;
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spin_lock_irqsave(&ssv_queue->lock, flags);
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if (list_empty(&ssv_queue->queue)) {
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ssv_list_node = NULL;
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} else {
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ssv_list_node = container_of((&ssv_queue->queue)->next, struct ssv6xxx_list_node, list);
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list_del_init(&ssv_list_node->list);
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}
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spin_unlock_irqrestore(&ssv_queue->lock, flags);
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return ssv_list_node;
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}
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#endif /* _SSV_DATA_STRUCT_H_ */
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