8c24d921b0
sample: examples\aliyun_iotkit_csdk_mqtt project: board\TencentOS_tiny_EVB_MX_Plus\KEIL\aliyun_iotkit_csdk_mqtt
112 lines
2.8 KiB
C
112 lines
2.8 KiB
C
/*
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* Copyright (C) 2015-2018 Alibaba Group Holding Limited
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*/
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#ifndef NGHTTP2_PQ_H
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#define NGHTTP2_PQ_H
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif /* HAVE_CONFIG_H */
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#include "nghttp2.h"
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#include "nghttp2_int.h"
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#include "nghttp2_mem.h"
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/* Implementation of priority queue */
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typedef struct {
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size_t index;
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} nghttp2_pq_entry;
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typedef struct {
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/* The pointer to the pointer to the item stored */
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nghttp2_pq_entry **q;
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/* Memory allocator */
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nghttp2_mem *mem;
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/* The number of items stored */
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size_t length;
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/* The maximum number of items this pq can store. This is
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automatically extended when length is reached to this value. */
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size_t capacity;
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/* The less function between items */
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nghttp2_less less;
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} nghttp2_pq;
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/*
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* Initializes priority queue |pq| with compare function |cmp|.
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*
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* This function returns 0 if it succeeds, or one of the following
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* negative error codes:
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*
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* NGHTTP2_ERR_NOMEM
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* Out of memory.
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*/
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int nghttp2_pq_init(nghttp2_pq *pq, nghttp2_less less, nghttp2_mem *mem);
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/*
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* Deallocates any resources allocated for |pq|. The stored items are
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* not freed by this function.
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*/
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void nghttp2_pq_free(nghttp2_pq *pq);
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/*
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* Adds |item| to the priority queue |pq|.
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*
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* This function returns 0 if it succeeds, or one of the following
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* negative error codes:
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*
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* NGHTTP2_ERR_NOMEM
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* Out of memory.
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*/
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int nghttp2_pq_push(nghttp2_pq *pq, nghttp2_pq_entry *item);
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/*
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* Returns item at the top of the queue |pq|. If the queue is empty,
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* this function returns NULL.
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*/
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nghttp2_pq_entry *nghttp2_pq_top(nghttp2_pq *pq);
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/*
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* Pops item at the top of the queue |pq|. The popped item is not
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* freed by this function.
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*/
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void nghttp2_pq_pop(nghttp2_pq *pq);
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/*
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* Returns nonzero if the queue |pq| is empty.
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*/
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int nghttp2_pq_empty(nghttp2_pq *pq);
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/*
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* Returns the number of items in the queue |pq|.
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*/
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size_t nghttp2_pq_size(nghttp2_pq *pq);
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typedef int (*nghttp2_pq_item_cb)(nghttp2_pq_entry *item, void *arg);
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/*
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* Updates each item in |pq| using function |fun| and re-construct
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* priority queue. The |fun| must return non-zero if it modifies the
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* item in a way that it affects ordering in the priority queue. The
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* |arg| is passed to the 2nd parameter of |fun|.
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*/
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void nghttp2_pq_update(nghttp2_pq *pq, nghttp2_pq_item_cb fun, void *arg);
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/*
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* Applys |fun| to each item in |pq|. The |arg| is passed as arg
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* parameter to callback function. This function must not change the
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* ordering key. If the return value from callback is nonzero, this
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* function returns 1 immediately without iterating remaining items.
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* Otherwise this function returns 0.
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*/
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int nghttp2_pq_each(nghttp2_pq *pq, nghttp2_pq_item_cb fun, void *arg);
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/*
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* Removes |item| from priority queue.
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*/
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void nghttp2_pq_remove(nghttp2_pq *pq, nghttp2_pq_entry *item);
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#endif /* NGHTTP2_PQ_H */
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