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blockingqueue.c

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#include <pthread.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <errno.h>

#include "base.h"

#include "queue.h"

static void BlockingQueue_add(IQueue* queue, int elem);

static int BlockingQueue_remove(IQueue* queue);

static int BlockingQueue_empty(IQueue* queue);

BlockingQueue* newBlockingQueue(IQueue* queue)

{

BlockingQueue* blockingQueue = (BlockingQueue*)malloc(sizeof(BlockingQueue));

if (blockingQueue == NULL) {

return NULL;

}

blockingQueue->queue = queue;

int err = pthread_mutex_init(&blockingQueue->mutex, NULL);

if (err) {

perror(strerror(err));

exit(1);

}

err = pthread_cond_init(&blockingQueue->cond, NULL);

if (err) {

perror(strerror(err));

exit(1);

}

blockingQueue->iqueue.add = BlockingQueue_add;

blockingQueue->iqueue.remove = BlockingQueue_remove;

blockingQueue->iqueue.empty = BlockingQueue_empty;

return blockingQueue;

}

BlockingQueue* newDefBlockingQueue()

{

LinkedQueue* linkedQueue = newDefLinkedQueue();

if (linkedQueue == NULL) {

return NULL;

}

return newBlockingQueue(&linkedQueue->iqueue);

}

void deleteBlockingQueue(BlockingQueue* queue)

{

int err = pthread_cond_destroy(&queue->cond);

if (err) {

perror(strerror(err));

}

err = pthread_mutex_destroy(&queue->mutex);

if (err) {

perror(strerror(err));

}

free(queue);

}

void deleteDefBlockingQueue(BlockingQueue* queue)

{

LinkedQueue* linkedQueue = container_of(queue->queue, LinkedQueue, iqueue);

deleteLinkedQueue(linkedQueue);

deleteBlockingQueue(queue);

}

void BlockingQueue_add(IQueue* queue, int elem)

{

BlockingQueue* blockingQueue = container_of(queue, BlockingQueue, iqueue);

int err = pthread_mutex_lock(&blockingQueue->mutex);

if (err) {

perror(strerror(err));

}

blockingQueue->queue->add(blockingQueue->queue, elem);

err = pthread_mutex_unlock(&blockingQueue->mutex);

if (err) {

perror(strerror(err));

}

err = pthread_cond_signal(&blockingQueue->cond);

if (err) {

perror(strerror(err));

}

}

int BlockingQueue_remove(IQueue* queue)

{

BlockingQueue* blockingQueue = container_of(queue, BlockingQueue, iqueue);

int err = pthread_mutex_lock(&blockingQueue->mutex);

if (err) {

perror(strerror(err));

}

while (blockingQueue->iqueue.empty(&blockingQueue->iqueue)) {

err = pthread_cond_wait(&blockingQueue->cond, &blockingQueue->mutex);

if (err) {

perror(strerror(err));

}

}

int value = blockingQueue->queue->remove(blockingQueue->queue);

err = pthread_mutex_unlock(&blockingQueue->mutex);

if (err) {

perror(strerror(err));

}

return value;

}

int BlockingQueue_empty(IQueue* queue)

{

BlockingQueue* blockingQueue = container_of(queue, BlockingQueue, iqueue);

return blockingQueue->queue->empty(blockingQueue->queue);

}