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authordeva <deva>2006-03-04 14:53:17 +0000
committerdeva <deva>2006-03-04 14:53:17 +0000
commitf02095ee5ceb78f1781a9e250693b8866ca42181 (patch)
tree7953c6b5f004f31ee9b340d7cdff5e85890594fc /lib/queue.h
parent71c713dce2b5128862b293aa7fcc1d7ee89ffaf1 (diff)
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ * queue.h
+ *
+ * Tue Nov 9 10:57:20 CET 2004
+ * Copyright 2004 Bent Bisballe
+ * deva@aasimon.org
+ ****************************************************************************/
+
+/*
+ * Originally from:
+ * RTVideoRec Realtime video recoder and encoder for Linux
+ *
+ * Copyright (C) 2004 B. Stultiens
+ */
+
+/*
+ * This file is part of MIaV.
+ *
+ * MIaV 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.
+ *
+ * MIaV 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 MIaV; 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();
+
+ int length();
+
+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>
+int Queue<T>::length()
+{
+ int length;
+ pthread_mutex_lock(&mutex);
+ length = count;
+ pthread_mutex_unlock(&mutex);
+ return length;
+}
+
+/**
+ * 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
+