- Bryan Henderson introduces two things:

1) the progress callback gets called more frequently (at times)
  2) libcurl *might* call the callback when it receives a signal

lib/progress.c

@@ -280,9 +280,6 @@ int Curl_pgrsUpdate(struct connectdata *conn)
     ((double)data->progress.uploaded/
      (data->progress.timespent>0?data->progress.timespent:1));
 
-  if(data->progress.lastshow == Curl_tvlong(now))
-    return 0; /* never update this more than once a second if the end isn't
-                 reached */
   data->progress.lastshow = now.tv_sec;
 
   /* Let's do the "current speed" thing, which should use the fastest
@@ -359,6 +356,10 @@ int Curl_pgrsUpdate(struct connectdata *conn)
     return result;
   }
 
+  if(data->progress.lastshow == Curl_tvlong(now))
+    return 0; /* never update this more than once a second if the end isn't
+                 reached */
+
   /* Figure out the estimated time of arrival for the upload */
   if((data->progress.flags & PGRS_UL_SIZE_KNOWN) &&
      (data->progress.ulspeed>0) &&