csci480_Project5/FIFO_4.cpp at main · pageap/csci480_Project5 · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
/*
Programmer: Adam Page
Programmer ID:
Class: csci480
Assignment#: 5
Date Due: 11/29/2020
*/
#include <fstream>
#include <iostream>
#include <stdlib.h>
#include <string>
#include <vector>
#include "enteryPage.h"
#include "physicalMemory.h"
#include "pageTable.h"

using namespace std;

vector<string> runList;
vector<string> virtualMemoryList;


//use void loadRunList to load each item to be referenced
void loadRunList()
{
	//load the reference string
	runList.push_back("main");
	runList.push_back("activity");
	runList.push_back("net");
	runList.push_back("main");
	runList.push_back("load");
	runList.push_back("holding");
	runList.push_back("main");
	runList.push_back("tax");
	runList.push_back("net");
	runList.push_back("main");
	runList.push_back("update");
	runList.push_back("holding");
	runList.push_back("net");
	runList.push_back("activity");
	runList.push_back("main");
	runList.push_back("print");
	runList.push_back("net");
}

//load the virtual memory with each item
void loadVirtualMemory()
{
	virtualMemoryList.push_back("main");
	virtualMemoryList.push_back("load");
	virtualMemoryList.push_back("tax");
	virtualMemoryList.push_back("update");
	virtualMemoryList.push_back("print");
	virtualMemoryList.push_back("holding");
	virtualMemoryList.push_back("activity");
	virtualMemoryList.push_back("net");
}


//int ItemtoPage accepts a string item name and returns the item's
//matching virtual page index
int ItemtoPageID(string ItemIn)
{
	//use for loop for every item in virtualMemoryList
	for (int i = 0; i < virtualMemoryList.size(); i++)
	{
		//get the current virutal memory list item
		string cItem = virtualMemoryList.at(i);

		//compare the requested run list item with the current virtual memory list item
		int sComp = cItem.compare(ItemIn);

		//if the two items match
		if (sComp == 0)
		{
			//return the current virtual memory list index
			return i;
		}
	}

	//if we get to here, no match was found
	return -1;
}

int main()
{
	//display welcome
	cout << "Welcome!" << endl;

	loadVirtualMemory();
	loadRunList();

	//running with 4 instead of 5
	PhysicalMemory physicalMem(4, 1);
	PageTable pTable(&physicalMem, virtualMemoryList.size());
	cout << "FIFO with 5 physical frames: " << endl;

	//for each item in the run list
	for (int i = 0; i < runList.size(); i++)
	{
		//fetch the virtual index for the string item
		int virtualIdx = ItemtoPageID(runList.at(i));

		//if the virtual frame index was found
		if (virtualIdx != -1)
		{
			//reference the item at the specified virtual index
			pTable.reference(virtualIdx, virtualMemoryList.at(virtualIdx));
		}
		//otherwise the item to virtual frame index failed
		else
		{
			//print an error message and break
			cout << "Failed to convert reference to virtual memory: " << runList.at(i) << endl;
			break;
		}
	}

	cout << "Main: now print" << endl << endl;

	//print physical memory and page table
	physicalMem.printMemory();
	pTable.printTable();

	return 0;
}