1 files changed, 248 insertions, 0 deletions
diff --git a/lib/queue.h b/lib/queue.h
new file mode 100644
index 0000000..3cb6fbc
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+++ b/lib/queue.h
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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
+