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/******************************************************************************
*
* Copyright (C) 2014 Google, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************/
#include "osi/allocator.h"
#include "osi/fixed_queue.h"
#include "osi/list.h"
#include "osi/osi.h"
#include "osi/mutex.h"
#include "osi/semaphore.h"
typedef struct fixed_queue_t {
list_t *list;
osi_sem_t enqueue_sem;
osi_sem_t dequeue_sem;
osi_mutex_t lock;
size_t capacity;
fixed_queue_cb dequeue_ready;
} fixed_queue_t;
fixed_queue_t *fixed_queue_new(size_t capacity)
{
fixed_queue_t *ret = osi_calloc(sizeof(fixed_queue_t));
if (!ret) {
goto error;
}
osi_mutex_new(&ret->lock);
ret->capacity = capacity;
ret->list = list_new(NULL);
if (!ret->list) {
goto error;
}
osi_sem_new(&ret->enqueue_sem, capacity, capacity);
if (!ret->enqueue_sem) {
goto error;
}
osi_sem_new(&ret->dequeue_sem, capacity, 0);
if (!ret->dequeue_sem) {
goto error;
}
return ret;
error:;
fixed_queue_free(ret, NULL);
return NULL;
}
void fixed_queue_free(fixed_queue_t *queue, fixed_queue_free_cb free_cb)
{
const list_node_t *node;
if (queue == NULL) {
return;
}
fixed_queue_unregister_dequeue(queue);
if (free_cb) {
for (node = list_begin(queue->list); node != list_end(queue->list); node = list_next(node)) {
free_cb(list_node(node));
}
}
list_free(queue->list);
osi_sem_free(&queue->enqueue_sem);
osi_sem_free(&queue->dequeue_sem);
osi_mutex_free(&queue->lock);
osi_free(queue);
}
bool fixed_queue_is_empty(fixed_queue_t *queue)
{
bool is_empty = false;
if (queue == NULL) {
return true;
}
osi_mutex_lock(&queue->lock, OSI_MUTEX_MAX_TIMEOUT);
is_empty = list_is_empty(queue->list);
osi_mutex_unlock(&queue->lock);
return is_empty;
}
size_t fixed_queue_length(fixed_queue_t *queue)
{
size_t length;
if (queue == NULL) {
return 0;
}
osi_mutex_lock(&queue->lock, OSI_MUTEX_MAX_TIMEOUT);
length = list_length(queue->list);
osi_mutex_unlock(&queue->lock);
return length;
}
size_t fixed_queue_capacity(fixed_queue_t *queue)
{
assert(queue != NULL);
return queue->capacity;
}
bool fixed_queue_enqueue(fixed_queue_t *queue, void *data, uint32_t timeout)
{
bool status=false; //Flag whether enqueued success
assert(queue != NULL);
assert(data != NULL);
if (osi_sem_take(&queue->enqueue_sem, timeout) != 0) {
return false;
}
osi_mutex_lock(&queue->lock, OSI_MUTEX_MAX_TIMEOUT);
status = list_append(queue->list, data); //Check whether enqueued success
osi_mutex_unlock(&queue->lock);
if(status == true )
osi_sem_give(&queue->dequeue_sem);
return status;
}
void *fixed_queue_dequeue(fixed_queue_t *queue, uint32_t timeout)
{
void *ret = NULL;
assert(queue != NULL);
if (osi_sem_take(&queue->dequeue_sem, timeout) != 0) {
return NULL;
}
osi_mutex_lock(&queue->lock, OSI_MUTEX_MAX_TIMEOUT);
ret = list_front(queue->list);
list_remove(queue->list, ret);
osi_mutex_unlock(&queue->lock);
osi_sem_give(&queue->enqueue_sem);
return ret;
}
void *fixed_queue_try_peek_first(fixed_queue_t *queue)
{
void *ret = NULL;
if (queue == NULL) {
return NULL;
}
osi_mutex_lock(&queue->lock, OSI_MUTEX_MAX_TIMEOUT);
ret = list_is_empty(queue->list) ? NULL : list_front(queue->list);
osi_mutex_unlock(&queue->lock);
return ret;
}
void *fixed_queue_try_peek_last(fixed_queue_t *queue)
{
void *ret = NULL;
if (queue == NULL) {
return NULL;
}
osi_mutex_lock(&queue->lock, OSI_MUTEX_MAX_TIMEOUT);
ret = list_is_empty(queue->list) ? NULL : list_back(queue->list);
osi_mutex_unlock(&queue->lock);
return ret;
}
void *fixed_queue_try_remove_from_queue(fixed_queue_t *queue, void *data)
{
bool removed = false;
if (queue == NULL) {
return NULL;
}
osi_mutex_lock(&queue->lock, OSI_MUTEX_MAX_TIMEOUT);
if (list_contains(queue->list, data) &&
osi_sem_take(&queue->dequeue_sem, 0) == 0) {
removed = list_remove(queue->list, data);
assert(removed);
}
osi_mutex_unlock(&queue->lock);
if (removed) {
osi_sem_give(&queue->enqueue_sem);
return data;
}
return NULL;
}
list_t *fixed_queue_get_list(fixed_queue_t *queue)
{
assert(queue != NULL);
// NOTE: This function is not thread safe, and there is no point for
// calling osi_mutex_lock() / osi_mutex_unlock()
return queue->list;
}
void fixed_queue_register_dequeue(fixed_queue_t *queue, fixed_queue_cb ready_cb)
{
assert(queue != NULL);
assert(ready_cb != NULL);
queue->dequeue_ready = ready_cb;
}
void fixed_queue_unregister_dequeue(fixed_queue_t *queue)
{
assert(queue != NULL);
queue->dequeue_ready = NULL;
}
void fixed_queue_process(fixed_queue_t *queue)
{
assert(queue != NULL);
if (queue->dequeue_ready) {
queue->dequeue_ready(queue);
}
}
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