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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*
* RTVideoRec Realtime video recoder and encoder for Linux
*
* Copyright (C) 2004 Bent Bisballe
* Copyright (C) 2004 B. Stultiens
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <config.h>
#ifndef __RTVIDEOREC_QUEUE_H
#define __RTVIDEOREC_QUEUE_H
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <avformat.h>
#include <avcodec.h>
#include "thread.h"
#include "util.h"
typedef struct __buf_t {
struct __buf_t *next;
struct __buf_t *prev;
void *data;
} buf_t;
template<typename T>
class Queue {
public:
Queue(int glimit = 0);
~Queue();
void push(T *t);
T *pop();
T *peek();
void lock();
void unlock();
void plength();
private:
volatile bool locked;
int limit;
buf_t *head;
buf_t *tail;
int count;
pthread_mutex_t mutex;
T *_pop();
};
/**
* Initialize queue
*/
template<typename T>
Queue<T>::Queue(int glimit)
{
locked = false;
pthread_mutex_init (&mutex, NULL);
limit = glimit;
count = 0;
head = NULL;
tail = NULL;
}
/**
* Clean up queue.
*/
template<typename T>
Queue<T>::~Queue()
{
if(count != 0) {
fprintf(stderr, "Queue not empty (%d)\n", count);
while(T *t = _pop()) delete t;
}
pthread_mutex_destroy(&mutex);
}
/**
* Push element on queue.
*/
template<typename T>
void Queue<T>::push(T *t)
{
if(locked) {
delete t;
return;
}
pthread_mutex_lock(&mutex);
buf_t *b = (buf_t*)xmalloc(sizeof(*b));
b->data = (void*)t;
assert(b != NULL);
if(limit && count > 0) {
T* tmp = (T*)_pop();
delete tmp;
}
if(!head) {
head = tail = b;
b->next = b->prev = NULL;
count = 1;
pthread_mutex_unlock(&mutex);
return;
}
b->next = tail;
b->prev = NULL;
if(tail)
tail->prev = b;
tail = b;
count++;
pthread_mutex_unlock(&mutex);
}
/**
* Pop element from queue.
* If queue is empty, NULL is returned.
*/
template<typename T>
T *Queue<T>::pop()
{
pthread_mutex_lock(&mutex);
T *d = _pop();
pthread_mutex_unlock(&mutex);
return d;
}
/**
* Pop helper method
* If queue is empty, NULL is returned.
*/
template<typename T>
T *Queue<T>::_pop()
{
T *d;
buf_t *b;
assert(count >= 0);
if(count == 0) {
return NULL;
}
b = head;
if(b->prev)
b->prev->next = NULL;
head = b->prev;
if(b == tail)
tail = NULL;
count--;
d = (T*)b->data;
free(b);
return d;
}
/**
* Peek foremost element in queue
* If queue is empty, NULL is returned.
*/
template<typename T>
T *Queue<T>::peek()
{
// pthread_mutex_lock(&mutex);
T *d;
// assert(count >= 0);
if(count == 0) {
return NULL;
}
d = (T*)head->data;
// pthread_mutex_unlock(&mutex);
return d;
}
/**
* Print current length of queue
*/
template<typename T>
void Queue<T>::plength()
{
pthread_mutex_lock(&mutex);
fprintf(stderr, "[ql: %d]", count);
fflush(stderr);
pthread_mutex_unlock(&mutex);
}
/**
* Lock the queue (all elements pushed from this point will be deleted.)
*/
template<typename T>
void Queue<T>::lock()
{
fprintf(stderr, "Lock this motherfucker..."); fflush(stderr);
locked = true;
fprintf(stderr, "done\n"); fflush(stderr);
}
/**
* Unlock the queue.
*/
template<typename T>
void Queue<T>::unlock()
{
fprintf(stderr, "Unlock this motherfucker..."); fflush(stderr);
locked = false;
fprintf(stderr, "done\n"); fflush(stderr);
}
#endif
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