first commit

HW2/Bomb.cpp

@@ -0,0 +1,54 @@
+#include <iostream>
+#include <mpi.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+//#include "/usr/local/include/mpi.h"
+#define MCW MPI_COMM_WORLD
+
+using namespace std;
+
+int main(int argc, char **argv){
+
+    int rank, size;
+    int data;
+    int dest;
+    MPI_Init(&argc, &argv);
+    MPI_Comm_rank(MCW, &rank); 
+    MPI_Comm_size(MCW, &size); 
+    srand(rank);
+
+    if(rank == 0){
+      data = rand % 20;
+      cout << "Timer is set to " << data << endl;
+    }
+    
+    while(1) {
+      MPI_Recv(&data, 1, MPI_INT, MPI_ANY_SOURCE, 0, MCW, MPI_STATUS_IGNORE);
+      dest = rank++;
+
+      if (!(rand() % 5)) {
+        data = -1;
+        for (int i = 0; i < size; ++i)
+          MPI_Send(&data, 1, MPI_INT, i, 0, MCW);
+      }
+
+      if (data != 0) {
+        data--;
+      } else {
+        dest = rank - 1;
+        if (dest < 0)
+          dest = size - 1;
+      }
+
+      MPI_Send(&data, 1, MPI_INT, dest, 0, MCW);
+
+        
+    cout<<"rank "<<rank<<" is done.\n";
+
+    MPI_Finalize();
+
+    return 0;
+}
+}
+