forked from KolibriOS/kolibrios
95 lines
2.3 KiB
C
95 lines
2.3 KiB
C
/**************************************************************************
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*
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* Copyright © 2009 Jakob Bornecrantz
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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#ifndef U_FIFO_H
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#define U_FIFO_H
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#include "util/u_memory.h"
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struct util_fifo
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{
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size_t head;
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size_t tail;
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size_t num;
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size_t size;
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};
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static INLINE struct util_fifo *
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u_fifo_create(size_t size)
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{
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struct util_fifo *fifo;
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fifo = MALLOC(sizeof(*fifo) + size * sizeof(void*));
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fifo->head = 0;
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fifo->tail = 0;
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fifo->num = 0;
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fifo->size = size;
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return fifo;
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}
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static INLINE boolean
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u_fifo_add(struct util_fifo *fifo, void *ptr)
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{
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void **array = (void**)&fifo[1];
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if (fifo->num >= fifo->size)
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return FALSE;
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if (++fifo->head >= fifo->size)
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fifo->head = 0;
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array[fifo->head] = ptr;
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++fifo->num;
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return TRUE;
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}
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static INLINE boolean
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u_fifo_pop(struct util_fifo *fifo, void **ptr)
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{
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void **array = (void**)&fifo[1];
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if (!fifo->num)
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return FALSE;
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if (++fifo->tail >= fifo->size)
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fifo->tail = 0;
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*ptr = array[fifo->tail];
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++fifo->num;
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return TRUE;
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}
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static INLINE void
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u_fifo_destroy(struct util_fifo *fifo)
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{
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FREE(fifo);
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}
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#endif
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