0,0 → 1,94 |
/************************************************************************** |
* |
* Copyright © 2009 Jakob Bornecrantz |
* |
* Permission is hereby granted, free of charge, to any person obtaining a |
* copy of this software and associated documentation files (the "Software"), |
* to deal in the Software without restriction, including without limitation |
* the rights to use, copy, modify, merge, publish, distribute, sublicense, |
* and/or sell copies of the Software, and to permit persons to whom the |
* Software is furnished to do so, subject to the following conditions: |
* |
* The above copyright notice and this permission notice (including the next |
* paragraph) shall be included in all copies or substantial portions of the |
* Software. |
* |
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
* DEALINGS IN THE SOFTWARE. |
* |
**************************************************************************/ |
|
#ifndef U_FIFO_H |
#define U_FIFO_H |
|
#include "util/u_memory.h" |
|
struct util_fifo |
{ |
size_t head; |
size_t tail; |
size_t num; |
size_t size; |
}; |
|
static INLINE struct util_fifo * |
u_fifo_create(size_t size) |
{ |
struct util_fifo *fifo; |
fifo = MALLOC(sizeof(*fifo) + size * sizeof(void*)); |
|
fifo->head = 0; |
fifo->tail = 0; |
fifo->num = 0; |
fifo->size = size; |
|
return fifo; |
} |
|
static INLINE boolean |
u_fifo_add(struct util_fifo *fifo, void *ptr) |
{ |
void **array = (void**)&fifo[1]; |
if (fifo->num >= fifo->size) |
return FALSE; |
|
if (++fifo->head >= fifo->size) |
fifo->head = 0; |
|
array[fifo->head] = ptr; |
|
++fifo->num; |
|
return TRUE; |
} |
|
static INLINE boolean |
u_fifo_pop(struct util_fifo *fifo, void **ptr) |
{ |
void **array = (void**)&fifo[1]; |
|
if (!fifo->num) |
return FALSE; |
|
if (++fifo->tail >= fifo->size) |
fifo->tail = 0; |
|
*ptr = array[fifo->tail]; |
|
++fifo->num; |
|
return TRUE; |
} |
|
static INLINE void |
u_fifo_destroy(struct util_fifo *fifo) |
{ |
FREE(fifo); |
} |
|
#endif |