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125 lines
4.2 KiB
125 lines
4.2 KiB
/*****************************************************************************
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* vlc_fifo_helper.h: Basic FIFO helper functions
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*****************************************************************************
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* Copyright (C) 2017 VLC authors and VideoLAN
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*
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* Authors: Steve Lhomme <robux4@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#ifndef VLC_FIFO_HELPER_H
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#define VLC_FIFO_HELPER_H 1
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typedef struct FIFO_ITEM {
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struct FIFO_ITEM *p_next;
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} fifo_item_t;
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typedef struct
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{
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fifo_item_t *p_first;
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fifo_item_t **pp_last;
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size_t i_depth;
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} fifo_t;
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static inline void fifo_Init(fifo_t *p_fifo)
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{
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p_fifo->p_first = NULL;
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p_fifo->pp_last = &p_fifo->p_first;
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p_fifo->i_depth = 0;
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}
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static inline void fifo_Release(fifo_t *fifo)
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{
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assert(fifo->i_depth == 0); /* we should have poped all the items */
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}
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static inline size_t fifo_GetCount(fifo_t *fifo)
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{
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return fifo->i_depth;
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}
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static inline fifo_item_t *fifo_Show(fifo_t *p_fifo)
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{
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fifo_item_t *b;
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assert(p_fifo->p_first != NULL);
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b = p_fifo->p_first;
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return b;
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}
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static inline fifo_item_t *fifo_Get(fifo_t *fifo)
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{
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fifo_item_t *block = fifo->p_first;
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if (block == NULL)
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return NULL; /* Nothing to do */
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fifo->p_first = block->p_next;
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if (block->p_next == NULL)
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fifo->pp_last = &fifo->p_first;
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block->p_next = NULL;
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assert(fifo->i_depth > 0);
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fifo->i_depth--;
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return block;
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}
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static inline void fifo_Put(fifo_t *fifo, fifo_item_t *p_item)
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{
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*(fifo->pp_last) = p_item;
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while (p_item != NULL)
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{
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fifo->pp_last = &p_item->p_next;
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fifo->i_depth++;
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p_item = p_item->p_next;
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}
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}
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/* macro to get the proper item type in/out of the FIFO
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* The item type must have a field fifo_item_t named fifo
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*/
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#define TYPED_FIFO(type, prefix) \
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static inline void prefix ## _fifo_Init(fifo_t *p_fifo) \
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{ \
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fifo_Init(p_fifo); \
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} \
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static inline void prefix ## _fifo_Release(fifo_t *p_fifo) \
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{ \
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fifo_Release(p_fifo); \
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} \
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static inline void prefix ## _fifo_Put(fifo_t *p_fifo, type *p_item) \
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{ \
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fifo_Put(p_fifo, &p_item->fifo); \
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} \
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static inline type *prefix ## _fifo_Get(fifo_t *p_fifo) \
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{ \
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return (type*)fifo_Get(p_fifo); \
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} \
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static inline type *prefix ## _fifo_Show(fifo_t *p_fifo) \
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{ \
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return (type*)fifo_Show(p_fifo); \
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} \
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static inline size_t prefix ## _fifo_GetCount(fifo_t *fifo) \
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{ \
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return fifo->i_depth; \
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}
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#endif /* VLC_FIFO_HELPER_H */
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