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7621d56a1b
Refs: https://github.com/nodejs/node/pull/44619 Co-authored-by: James M Snell <jasnell@gmail.com> PR-URL: https://github.com/nodejs/node/pull/44622 Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
130 lines
4.0 KiB
C
130 lines
4.0 KiB
C
/*
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* nghttp3
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*
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* Copyright (c) 2019 nghttp3 contributors
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* Copyright (c) 2017 ngtcp2 contributors
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* Copyright (c) 2012 nghttp2 contributors
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef NGHTTP3_PQ_H
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#define NGHTTP3_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 <nghttp3/nghttp3.h>
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#include "nghttp3_mem.h"
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/* Implementation of priority queue */
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/* NGHTTP3_PQ_BAD_INDEX is the priority queue index which indicates
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that an entry is not queued. Assigning this value to
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nghttp3_pq_entry.index can check that the entry is queued or not. */
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#define NGHTTP3_PQ_BAD_INDEX SIZE_MAX
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typedef struct nghttp3_pq_entry {
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size_t index;
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} nghttp3_pq_entry;
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/* "less" function, return nonzero if |lhs| is less than |rhs|. */
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typedef int (*nghttp3_less)(const nghttp3_pq_entry *lhs,
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const nghttp3_pq_entry *rhs);
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typedef struct nghttp3_pq {
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/* The pointer to the pointer to the item stored */
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nghttp3_pq_entry **q;
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/* Memory allocator */
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const nghttp3_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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nghttp3_less less;
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} nghttp3_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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void nghttp3_pq_init(nghttp3_pq *pq, nghttp3_less less, const nghttp3_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 nghttp3_pq_free(nghttp3_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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* NGHTTP3_ERR_NOMEM
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* Out of memory.
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*/
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int nghttp3_pq_push(nghttp3_pq *pq, nghttp3_pq_entry *item);
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/*
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* Returns item at the top of the queue |pq|. It is undefined if the
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* queue is empty.
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*/
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nghttp3_pq_entry *nghttp3_pq_top(const nghttp3_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 nghttp3_pq_pop(nghttp3_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 nghttp3_pq_empty(const nghttp3_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 nghttp3_pq_size(const nghttp3_pq *pq);
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typedef int (*nghttp3_pq_item_cb)(nghttp3_pq_entry *item, void *arg);
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/*
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* Applies |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 nghttp3_pq_each(const nghttp3_pq *pq, nghttp3_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 nghttp3_pq_remove(nghttp3_pq *pq, nghttp3_pq_entry *item);
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void nghttp3_pq_clear(nghttp3_pq *pq);
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#endif /* NGHTTP3_PQ_H */
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