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5610573 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 | /* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* ====================================================================
* Copyright (c) 2015 Carnegie Mellon University. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* This work was supported in part by funding from the Defense Advanced
* Research Projects Agency and the National Science Foundation of the
* United States of America, and the CMU Sphinx Speech Consortium.
*
* THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND
* ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY
* NOR ITS EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* ====================================================================
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <pocketsphinx/err.h>
#include "util/priority_queue.h"
#include "util/ckd_alloc.h"
struct priority_queue_s {
void **pointers;
size_t alloc_size;
size_t size;
void *max_element;
int (*compare)(const void *a, const void *b);
};
priority_queue_t* priority_queue_create(size_t len, int (*compare)(const void *a, const void *b))
{
priority_queue_t* queue;
queue = (priority_queue_t *)ckd_calloc(1, sizeof(*queue));
queue->alloc_size = len;
queue->pointers = (void **)ckd_calloc(len, sizeof(*queue->pointers));
queue->size = 0;
queue->max_element = NULL;
queue->compare = compare;
return queue;
}
void* priority_queue_poll(priority_queue_t *queue)
{
size_t i;
void *res;
if (queue->size == 0) {
E_WARN("Trying to poll from empty queue\n");
return NULL;
}
if (queue->max_element == NULL) {
E_ERROR("Trying to poll from queue and max element is undefined\n");
return NULL;
}
res = queue->max_element;
for (i = 0; i < queue->alloc_size; i++) {
if (queue->pointers[i] == queue->max_element) {
queue->pointers[i] = NULL;
break;
}
}
queue->max_element = NULL;
for (i = 0; i < queue->alloc_size; i++) {
if (queue->pointers[i] == 0)
continue;
if (queue->max_element == NULL) {
queue->max_element = queue->pointers[i];
} else {
if (queue->compare(queue->pointers[i], queue->max_element) < 0)
queue->max_element = queue->pointers[i];
}
}
queue->size--;
return res;
}
void priority_queue_add(priority_queue_t *queue, void *element)
{
size_t i;
if (queue->size == queue->alloc_size) {
E_ERROR("Trying to add element into full queue\n");
return;
}
for (i = 0; i < queue->alloc_size; i++) {
if (queue->pointers[i] == NULL) {
queue->pointers[i] = element;
break;
}
}
if (queue->max_element == NULL || queue->compare(element, queue->max_element) < 0) {
queue->max_element = element;
}
queue->size++;
}
size_t priority_queue_size(priority_queue_t *queue)
{
return queue->size;
}
void priority_queue_free(priority_queue_t *queue, void (*free_ptr)(void *a))
{
size_t i;
for (i = 0; i < queue->alloc_size; i++) {
if (queue->pointers[i] != NULL) {
if (free_ptr == NULL) {
ckd_free(queue->pointers[i]);
} else {
free_ptr(queue->pointers[i]);
}
}
}
ckd_free(queue->pointers);
ckd_free(queue);
}
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