Change sleep_until_file_created to sleep 100 millisecond instead of sleeping 1...

Change sleep_until_file_created to sleep 100 millisecond instead of sleeping 1 seconds between each iteration.

mysql-test/lib/mtr_process.pl

@@ -832,8 +832,10 @@ sub sleep_until_file_created ($$$) {
   my $pidfile= shift;
   my $timeout= shift;
   my $pid=     shift;
+  my $sleeptime= 100; # Milliseconds
+  my $loops= ($timeout * 1000) / $sleeptime;
 
-  for ( my $loop= 1; $loop <= $timeout; $loop++ )
+  for ( my $loop= 1; $loop <= $loops; $loop++ )
   {
     if ( -r $pidfile )
     {
@@ -841,21 +843,25 @@ sub sleep_until_file_created ($$$) {
     }
 
     # Check if it died after the fork() was successful
-    if ( $pid > 0 && waitpid($pid,&WNOHANG) == $pid )
+    if ( $pid != 0 && waitpid($pid,&WNOHANG) == $pid )
     {
       return 0;
     }
 
-    mtr_debug("Sleep 1 second waiting for creation of $pidfile");
+    mtr_debug("Sleep $sleeptime milliseconds waiting for ".
+	      "creation of $pidfile");
 
-    if ( $loop % 60 == 0 )
+    # Print extra message every 60 seconds
+    my $seconds= ($loop * $sleeptime) / 1000;
+    if ( $seconds > 1 and $seconds % 60 == 0 )
     {
-      my $left= $timeout - $loop;
-      mtr_warning("Waited $loop seconds for $pidfile to be created, " .
+      my $left= $timeout - $seconds;
+      mtr_warning("Waited $seconds seconds for $pidfile to be created, " .
                   "still waiting for $left seconds...");
     }
 
-    sleep(1);
+    # Millisceond sleep emulated with select
+    select(undef, undef, undef, ($sleeptime/1000));
   }
 
   return 0;