# KDP Midterm (2026-01-10) Question 2
Consider a dining table that can seat at most $N$ people ($N > 2$). A person may take some food, sit at the table (`sitAtTable()`), eat, leave the table (`leaveTable()`) and walk away. No person should eat alone i.e. sit at the table alone. Also, every person that takes food must necessarily sit down in order to eat. Create a solution for this probalom using a *signal and wait* monitor. The monitor should only have two methods `sitAtTable()` and `leaveTable()`


## Solution
```c
#define N ... /* N > 2 */

monitor Table {
    int count = 0;
    cond wantToSit;
    cond wantToLeave;
    
    void sitAtTable() {
        while (count == N)
            wantToSit.wait();
        count += 1;
        if (count == 1)
            wantToLeave.wait();
    }
    
    void leaveTable() {
        while (count == 2)
            wantToLeave.wait();
        count -= 1;
        if (count >= 2)
            wantToLeave.signal();
        wantToSit.signal();
    }
}
```