Create Building H2O.java

varunu28 · web-flow · commit 1bf1b998160c · 2022-04-06T16:58:41.000+05:30
diff --git a/Concurrency/Building H2O.java b/Concurrency/Building H2O.java
@@ -0,0 +1,26 @@
+class H2O {
+  private Semaphore hydrogen;
+  private Semaphore oxygen;
+  private Semaphore mutex;
+
+  public H2O() {
+    this.hydrogen = new Semaphore(2);
+    this.oxygen = new Semaphore(0);
+    this.mutex = new Semaphore(1);
+  }
+
+  public void hydrogen(Runnable releaseHydrogen) throws InterruptedException {
+    // releaseHydrogen.run() outputs "H". Do not change or remove this line.
+    this.hydrogen.acquire();
+    releaseHydrogen.run();
+    this.oxygen.release();
+  }
+
+  public void oxygen(Runnable releaseOxygen) throws InterruptedException {
+    this.mutex.acquire();
+    this.oxygen.acquire(2);
+    releaseOxygen.run();
+    this.hydrogen.release(2);
+    this.mutex.release();
+  }
+}
