You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
102 lines
1.7 KiB
102 lines
1.7 KiB
/*
|
|
queues frames
|
|
Copyright (C) 2001 Martin Vogt
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU Library General Public License as published by
|
|
the Free Software Foundation.
|
|
|
|
For more information look at the file COPYRIGHT in this package
|
|
|
|
*/
|
|
|
|
|
|
#include "frameQueue.h"
|
|
|
|
#include <iostream>
|
|
|
|
using namespace std;
|
|
|
|
FrameQueue::FrameQueue(int maxsize) {
|
|
this->size=maxsize;
|
|
entries = new Frame*[size];
|
|
int i;
|
|
for(i=0;i<size;i++) {
|
|
entries[i]=NULL;
|
|
}
|
|
fillgrade=0;
|
|
writepos=0;
|
|
readpos=0;
|
|
}
|
|
|
|
|
|
FrameQueue::~FrameQueue() {
|
|
int i;
|
|
for(i=0;i<size;i++) {
|
|
if (entries[i] != NULL) {
|
|
delete entries[i];
|
|
}
|
|
}
|
|
delete entries;
|
|
}
|
|
|
|
int FrameQueue::canRead() {
|
|
return (fillgrade > 0);
|
|
}
|
|
|
|
|
|
int FrameQueue::canWrite() {
|
|
return (fillgrade < size);
|
|
}
|
|
|
|
|
|
int FrameQueue::getFillgrade() {
|
|
return fillgrade;
|
|
}
|
|
|
|
|
|
void FrameQueue::enqueue(Frame* frame) {
|
|
if(canWrite() == false) {
|
|
cout << "FrameQueue full cannot enqueue"<<endl;
|
|
exit(0);
|
|
}
|
|
fillgrade++;
|
|
entries[writepos]=frame;
|
|
writepos++;
|
|
if (writepos == size) {
|
|
writepos=0;
|
|
}
|
|
}
|
|
|
|
|
|
Frame* FrameQueue::dequeue() {
|
|
if(canRead() == false) {
|
|
cout << "FrameQueue empty cannot dequeue"<<endl;
|
|
exit(0);
|
|
}
|
|
Frame* back=entries[readpos];
|
|
// invalide this frame, we do not longer own it!
|
|
entries[readpos]=NULL;
|
|
fillgrade--;
|
|
readpos++;
|
|
if (readpos == size) {
|
|
readpos=0;
|
|
}
|
|
return back;
|
|
}
|
|
|
|
Frame* FrameQueue::peekqueue(int pos) {
|
|
if(fillgrade-pos <= 0) {
|
|
cout << "FrameQueue : cannot peek this positon"<<endl;
|
|
cout << "fillgrade:"<<fillgrade<<endl;
|
|
cout << "pos:"<<pos<<endl;
|
|
exit(0);
|
|
}
|
|
int getpos=(readpos+pos) % size;
|
|
|
|
|
|
Frame* back=entries[getpos];
|
|
return back;
|
|
}
|
|
|