Util/IoPriority.cs

   1 //
   2 // IoPriority.cs
   3 //
   4 // Copyright (C) 2005 Novell, Inc.
   5 //
   6
   7 //
   8 // Permission is hereby granted, free of charge, to any person obtaining a
   9 // copy of this software and associated documentation files (the "Software"),
  10 // to deal in the Software without restriction, including without limitation
  11 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12 // and/or sell copies of the Software, and to permit persons to whom the
  13 // Software is furnished to do so, subject to the following conditions:
  14 //
  15 // The above copyright notice and this permission notice shall be included in
  16 // all copies or substantial portions of the Software.
  17 //
  18 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  21 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  23 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  24 // DEALINGS IN THE SOFTWARE.
  25 //
  26
  27 using System;
  28 using System.Runtime.InteropServices;
  29
  30 namespace Beagle.Util {
  31
  32         public class IoPriority {
  33
  34                 private IoPriority () {} // Static class
  35
  36                 [DllImport ("libbeagleglue")]
  37                 static extern int set_io_priority_idle ();
  38
  39                 [DllImport ("libbeagleglue")]
  40                 static extern int set_io_priority_best_effort (int ioprio);
  41
  42                 static public bool SetIdle ()
  43                 {
  44                         // Continue with a warning if we can't set the
  45                         // IO-priority to idle, not a big deal.
  46                         if (set_io_priority_idle () == -1) {
  47                                 Logger.Log.Warn ("Unable to set IO priority for process to idle");
  48                                 return false;
  49                         }
  50
  51                         Logger.Log.Debug ("IO priority for process set to idle");
  52                         return true;
  53                 }
  54
  55                 static public bool SetIoPriority (int ioprio)
  56                 {
  57                         if (set_io_priority_best_effort (ioprio) == -1) {
  58                                 Logger.Log.Warn ("Unable to set best effort IO priority for process to {0}", ioprio);
  59                                 return false;
  60                         }
  61
  62                         Logger.Log.Debug ("IO priority for process set to best effort {0}", ioprio);
  63                         return true;
  64                 }
  65         }
  66 }