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#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <stdint.h> /* defines SIZE_MAX */
#include "../error/error.h"
#include "knowledge.h"
/** Basic functions of the ZoO_knowledge structure ****************************/
/* See: "knowledge.h" */
int ZoO_knowledge_initialize (struct ZoO_knowledge k [const restrict static 1])
{
int error;
ZoO_index reserved_word_id;
k->words = (struct ZoO_knowledge_word *) NULL;
k->words_length = 0;
k->words_sorted = (ZoO_index *) NULL;
k->sequences = (ZoO_index **) NULL;
k->sequences_length = 0;
k->sequences_sorted = (ZoO_index *) NULL;
error = pthread_mutex_init(&(k->mutex), (const pthread_mutexattr_t *) NULL);
if (error != 0)
{
fprintf
(
stderr,
"[F] Unable to initialize knowledge mutex: %s.\n",
strerror(error)
);
return -1;
}
if
(
(
ZoO_knowledge_learn_word
(
k,
"[SoS]",
5,
&reserved_word_id,
stderr
) < 0
)
||
(
ZoO_knowledge_learn_word
(
k,
"[EoS]",
5,
&reserved_word_id,
stderr
) < 0
)
)
{
ZoO_S_FATAL(stderr, "Unable to learn reserved words.");
return -1;
}
return 0;
}
int ZoO_knowledge_lock_access
(
struct ZoO_knowledge k [const restrict static 1],
FILE io [const restrict static 1]
)
{
int err;
err = pthread_mutex_lock(&(k->mutex));
if (err != 0)
{
ZoO_ERROR
(
io,
"Unable to get exclusive access to knowledge: %s",
strerror(err)
);
return -1;
}
return 0;
}
void ZoO_knowledge_unlock_access
(
struct ZoO_knowledge k [const restrict static 1],
FILE io [const restrict static 1]
)
{
int err;
err = pthread_mutex_unlock(&(k->mutex));
if (err != 0)
{
ZoO_ERROR
(
io,
"Unable to release exclusive access to knowledge: %s",
strerror(err)
);
}
}
void ZoO_knowledge_get_word
(
const struct ZoO_knowledge k [const static 1],
const ZoO_index word_ref,
const ZoO_char * word [const restrict static 1],
ZoO_index word_length [const restrict static 1]
)
{
*word = k->words[word_ref].word;
*word_length = k->words[word_ref].word_length;
}
int ZoO_knowledge_rarest_word
(
const struct ZoO_knowledge k [const static 1],
const ZoO_index sequence [const restrict static 1],
const size_t sequence_length,
ZoO_index word_id [const restrict static 1]
)
{
ZoO_index current_max_score;
size_t i;
int success;
current_max_score = ZoO_INDEX_MAX;
success = -1;
for (i = 0; i < sequence_length; ++i)
{
if
(
(k->words[sequence[i]].occurrences <= current_max_score)
/* Otherwise we might just have learned it, or it must not be used. */
&& (k->words[sequence[i]].occurrences > 1)
)
{
current_max_score = k->words[sequence[i]].occurrences;
*word_id = sequence[i];
success = 0;
}
}
return success;
}
|
