Add other concurrency-focused Data Structures

README.md

@@ -156,6 +156,8 @@ For instance, take into account the snaptshot above. If you already know how to
         * [Courated List of the 10 best free resources](https://medium.freecodecamp.org/these-are-the-best-free-courses-to-learn-data-structures-and-algorithms-in-depth-4d52f0d6b35a) 📰 🆓
          * Locks
            * [Let's talk locks! - Kavya Joshi](https://www.youtube.com/watch?v=tjpncm3xTTc) 📼 🆓
+         * Futex
+         * Semaphores
          * Alternative Data Structures
            * [“Esoteric Data Structures and Where to Find Them” - Allan Deutsch](https://www.youtube.com/watch?v=-8UZhDjgeZU) 📼 🆓
                 * 0:36 Slot map

resources/topic-graph.mmd

@@ -27,9 +27,11 @@ graph TD
       ALG --> CPX[Complexity]
     PT --> DS[Data Scructures]
       DS --> Lock[Lock]
+      DS --> Futex[Futex]
+      DS --> Semaphore
       DS --> Graph[Graph]
       DS --> T3[Tree]
-      DS --> HS[Hash]
+      DS --> HS[HashMap/Table]
 
     SW --> DB[Databases]
       DB --> DBT[Theory]