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#include <pthread.h>
#include <stdlib.h>
#include <stdio.h>
#include "types.h"
#include "fifoqueue.h"
pthread_mutex_t lock;
pthread_mutex_t bufferEmptyBlock;
Fifo_q *
init_queue(int size)
{
Fifo_q * q = (Fifo_q *) malloc(sizeof(Fifo_q));
q->head = NULL;
q->tail = NULL;
q->maxSize = size;
q->currentSize = 0;
if (pthread_mutex_init(&lock, NULL) != 0)
{
printf("WARNING: Couldn't initialize lock\n");
}
if (pthread_mutex_init(&bufferEmptyBlock, NULL) != 0)
{
printf("WARNING: Couldn't initialize blocking lock\n");
}
pthread_mutex_lock(&bufferEmptyBlock);
return q;
}
boolean
is_full(Fifo_q * q)
{
if(q->currentSize < q->maxSize)
return false;
else
return true;
}
boolean
is_empty(Fifo_q * q)
{
if(q->head==NULL)
return true;
else
return false;
}
int
add_to_queue(Fifo_q * q, Sensor_t * sensor)
{
pthread_mutex_lock(&lock);
/* TODO delete first one if full */
if(q == NULL){
return -1;
}
else if(is_full(q)){
return -1;
}
Queue_t * new_elem = (Queue_t *) malloc(sizeof(Queue_t));
new_elem->next = NULL;
new_elem->sensor = sensor;
if(is_empty(q)){
q->head = new_elem;
pthread_mutex_unlock(&bufferEmptyBlock);
}else
q->tail->next = new_elem;
q->tail = new_elem;
q->currentSize++;
pthread_mutex_unlock(&lock);
return 1;
}
Sensor_t *
pop_from_queue(Fifo_q * q)
{
if(is_empty(q)){
perror("The queue is empty");
pthread_mutex_lock(&bufferEmptyBlock);
}
pthread_mutex_lock(&lock);
Queue_t * head = q->head;
q->head = head->next;
Sensor_t * sensor = head->sensor;
free(head);
q->currentSize--;
pthread_mutex_unlock(&lock);
return sensor;
}
Sensor_t *
create_sensor_object(int value, int uid){
Sensor_t * sensor = (Sensor_t *) malloc(sizeof(Sensor_t));
sensor->value = value;
sensor->uid = uid;
return sensor;
}
void
print_queue(Fifo_q * q)
{
pthread_mutex_lock(&lock);
Queue_t * current = q->head;
if(current == NULL){
printf("The queue is empty!");
return;
}
while(current != NULL){
printf("sensor value=%d, sensor uid=%d\n",
current->sensor->value, current->sensor->uid);
current = current->next;
}
pthread_mutex_unlock(&lock);
}
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