add fine_list with implemented add_function

Assignment_2/FineList.cpp

@@ -0,0 +1,76 @@
+#include<iostream>
+#include<thread>
+#include <algorithm>
+#include <queue>
+#include <mutex>
+#include <assert.h>
+#include <bits/stdc++.h> 
+
+// TODO: implement fine grained locking
+
+class Node { 
+public: 
+    int data; 
+    Node* next;
+    std::mutex mut; 
+    public:
+        void lock();
+        void unlock();
+};
+void Node::lock() {
+    this->mut.lock();
+} 
+void Node::unlock() {
+    this->mut.unlock();
+}
+
+class Set {
+    Node* first;
+    public:
+        Set();
+        bool add(int element);
+        bool rmv(int element);
+        bool ctn(int element);
+};
+
+Set::Set(){
+    first = new Node(); // dummy node;
+    Node* last = new Node();
+    last->data = INT_MAX; // end node;
+    first->next = last;
+}
+
+bool Set::add(int element) {
+    this->first->lock();
+    Node* p = this->first;
+    Node* c = p->next;
+    c->lock();
+    while (c->data < element) {
+        p->unlock();
+        p = c;
+        c = c->next;
+        c->lock();
+
+        if (c->data == element) {
+            c->unlock();
+            p->unlock();
+            return false;
+        }
+    }
+        
+        Node* n = new Node();
+        n->data = element;
+        n->next = c;
+        p->next = n;
+        
+        c->unlock();
+        p->unlock();
+        return true;        
+    }
+
+bool Set::rmv(int element) {
+    return false;
+}
+bool Set::ctn(int element) {
+    return false;
+}