Fixed overflow in local_thr results calculation

perf/local_thr.cpp

@@ -26,34 +26,21 @@
 
 int main (int argc, char *argv [])
 {
-    const char *bind_to;
-    int message_count;
-    size_t message_size;
-    void *ctx;
-    void *s;
-    int rc;
-    int i;
-    zmq_msg_t msg;
-    void *watch;
-    unsigned long elapsed;
-    unsigned long throughput;
-    double megabits;
-
     if (argc != 4) {
         printf ("usage: local_thr <bind-to> <message-size> <message-count>\n");
         return 1;
     }
-    bind_to = argv [1];
-    message_size = atoi (argv [2]);
-    message_count = atoi (argv [3]);
+    const char *bind_to = argv [1];
+    size_t message_size = atoi (argv [2]);
+    int message_count = atoi (argv [3]);
 
-    ctx = zmq_init (1);
+    void *ctx = zmq_init (1);
     if (!ctx) {
         printf ("error in zmq_init: %s\n", zmq_strerror (errno));
         return -1;
     }
 
-    s = zmq_socket (ctx, ZMQ_PULL);
+    void *s = zmq_socket (ctx, ZMQ_PULL);
     if (!s) {
         printf ("error in zmq_socket: %s\n", zmq_strerror (errno));
         return -1;
@@ -62,12 +49,13 @@ int main (int argc, char *argv [])
     //  Add your socket options here.
     //  For example ZMQ_RATE, ZMQ_RECOVERY_IVL and ZMQ_MCAST_LOOP for PGM.
 
-    rc = zmq_bind (s, bind_to);
+    int rc = zmq_bind (s, bind_to);
     if (rc != 0) {
         printf ("error in zmq_bind: %s\n", zmq_strerror (errno));
         return -1;
     }
 
+    zmq_msg_t msg;
     rc = zmq_msg_init (&msg);
     if (rc != 0) {
         printf ("error in zmq_msg_init: %s\n", zmq_strerror (errno));
@@ -84,8 +72,9 @@ int main (int argc, char *argv [])
         return -1;
     }
 
-    watch = zmq_stopwatch_start ();
+    void *watch = zmq_stopwatch_start ();
 
+    int i;
     for (i = 0; i != message_count - 1; i++) {
         rc = zmq_recvmsg (s, &msg, 0);
         if (rc < 0) {
@@ -98,7 +87,7 @@ int main (int argc, char *argv [])
         }
     }
 
-    elapsed = zmq_stopwatch_stop (watch);
+    unsigned long elapsed = zmq_stopwatch_stop (watch);
     if (elapsed == 0)
         elapsed = 1;
 
@@ -108,9 +97,8 @@ int main (int argc, char *argv [])
         return -1;
     }
 
-    throughput = (unsigned long)
-        ((double) message_count / (double) elapsed * 1000000);
-    megabits = (double) (throughput * message_size * 8) / 1000000;
+    double throughput = ((double) message_count / (double) elapsed) * 1000000;
+    double megabits = (double) (throughput * message_size * 8) / 1000000;
 
     printf ("message size: %d [B]\n", (int) message_size);
     printf ("message count: %d\n", (int) message_count);