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Clock replacement algorithm . arr - is physical memory arr2 - pages (virtual memory) if arr haven't page , then replace frame which have R=0 ; If all frames have R=1; Initialize all R=0; IF frame have page and R=1 . Do nothing . Else R=1;

#include<iostream>
using namespace std;
struct Frame
{
    char content;
    int R;
};
int main()
{
    int arr2[] = { 1, 2, 3, 4, 1, 2, 5, 6 };

    Frame arr[3];
    arr[0].R = 1;
    arr[0].content = arr2[0];
    arr[1].R = 1;
    arr[1].content = arr2[1];
    arr[2].R = 1;
    arr[2].content = arr2[2];
    arr[3].R = 1;
    arr[3].content = arr2[3];

    for (int i = 0; i < 3; i++)
    {
        for (int j = 4; j < 8; j++)
        {
            if ((arr[i].content == arr2[j]) && (arr[i].R = 1))
            {
                cout << "Frame have this page";
            }
            else if ((arr[i].content == arr2[j]) && (arr[i].R = 0))
            {
                arr[i].R = 1;
            }
            else if ((arr[i].content != arr2[j]) && (arr[i].R = 1))
            {
                arr[i].R = 0;
            }
            else 
            {
                arr[i].content = arr2[j];
                arr[i].R = 1;
            }
        }
    }

    for (int i = 0; i < 3; i++)
    {
        cout << arr[i].content << " " << arr[i].R << endl;
    }


    system("pause");
    return 0;
}

Error 1 error LNK1168: cannot open C:\Users\h\Documents\Visual Studio 2013\Projects\os clock\Debug\os clock.exe for writing C:\Users\h\Documents\Visual Studio 2013\Projects\os clock\os clock\LINK os clock

Arno
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Lord_of_Games
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  • The crystal ball thinks that the exe is already running. – molbdnilo Nov 25 '14 at 12:23
  • _Oh Lord Won't you buy me..._ What is the question? Error message points to either "os clock.exe" running, missing write permission, or wrong path. – Arno Nov 25 '14 at 12:28

1 Answers1

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This error means program is running and you again command compiler to run program although exe file is remain open. first close exe file than run program eliminate this error.

Shahzil
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