tests/test_stream_poll.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Copyright 2011 Alexis Laferrière <alexis.laf@xymus.net>
   4 #
   5 # Licensed under the Apache License, Version 2.0 (the "License");
   6 # you may not use this file except in compliance with the License.
   7 # You may obtain a copy of the License at
   8 #
   9 #     http://www.apache.org/licenses/LICENSE-2.0
  10 #
  11 # Unless required by applicable law or agreed to in writing, software
  12 # distributed under the License is distributed on an "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14 # See the License for the specific language governing permissions and
  15 # limitations under the License.
  16
  17 # Test logic: 3 processes are launched with a predictable return order,
  18 # if poll works correctly it will report when their stdout is closed.
  19
  20 var p1
  21 var p2
  22 var p3
  23
  24 p1 = new ProcessReader( "sleep", "0.2" )
  25 p2 = new ProcessReader( "sleep", "0.1" )
  26 p3 = new ProcessReader( "sleep", "0.4" )
  27
  28 var order = new Array[FileStream]
  29 var streams = [p1.stream_in, p2.stream_in, p3.stream_in]
  30
  31 while not streams.is_empty do
  32         var s = poll( streams )
  33         if s == null then continue # may have been interrupted
  34
  35         order.add( s )
  36         streams.remove( s.as(FileReader ) )
  37 end
  38
  39 print order[0] == p2.stream_in
  40 print order[1] == p1.stream_in
  41 print order[2] == p3.stream_in
  42