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/*
* Copyright © 2015 Intel Corporation
*
* 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.
*/
/*
* u_vector is a vector based queue for storing arbitrary
* sized arrays of objects without using a linked list.
*/
#ifndef U_VECTOR_H
#define U_VECTOR_H
#include <stdint.h>
#include <stdlib.h>
#include "util/macros.h"
#include "util/u_math.h"
#ifdef __cplusplus
extern "C" {
#endif
/* TODO - move to u_math.h - name it better etc */
static inline uint32_t
u_align_u32(uint32_t v, uint32_t a)
{
assert(a != 0 && a == (a & -((int32_t) a)));
return (v + a - 1) & ~(a - 1);
}
struct u_vector {
uint32_t head;
uint32_t tail;
uint32_t element_size;
uint32_t size;
void *data;
};
int u_vector_init_pow2(struct u_vector *queue,
uint32_t initial_element_count,
uint32_t element_size);
void *u_vector_add(struct u_vector *queue);
void *u_vector_remove(struct u_vector *queue);
static inline int
u_vector_init(struct u_vector *queue,
uint32_t initial_element_count,
uint32_t element_size)
{
initial_element_count = util_next_power_of_two(initial_element_count);
element_size = util_next_power_of_two(element_size);
return u_vector_init_pow2(queue, initial_element_count, element_size);
}
static inline int
u_vector_length(struct u_vector *queue)
{
return (queue->head - queue->tail) / queue->element_size;
}
static inline void *
u_vector_head(struct u_vector *vector)
{
assert(vector->tail < vector->head);
return (void *)((char *)vector->data +
((vector->head - vector->element_size) &
(vector->size - 1)));
}
static inline void *
u_vector_tail(struct u_vector *vector)
{
return (void *)((char *)vector->data + (vector->tail & (vector->size - 1)));
}
static inline void
u_vector_finish(struct u_vector *queue)
{
free(queue->data);
}
#ifdef __cplusplus
#define u_vector_element_cast(elem) (decltype(elem))
#else
#define u_vector_element_cast(elem) (void *)
#endif
#define u_vector_foreach(elem, queue) \
STATIC_ASSERT(__builtin_types_compatible_p(__typeof__(queue), struct u_vector *)); \
for (uint32_t __u_vector_offset = (queue)->tail; \
elem = u_vector_element_cast(elem)((char *)(queue)->data + \
(__u_vector_offset & ((queue)->size - 1))), \
__u_vector_offset != (queue)->head; \
__u_vector_offset += (queue)->element_size)
#ifdef __cplusplus
}
#endif
#endif
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