mcs/class/referencesource/System.Web/Util/counter.cs

   1 //------------------------------------------------------------------------------
   2 // <copyright file="counter.cs" company="Microsoft">
   3 //     Copyright (c) Microsoft Corporation.  All rights reserved.
   4 // </copyright>
   5 //------------------------------------------------------------------------------
   6
   7 namespace System.Web.Util {
   8     using System;
   9     using System.Web;
  10     using System.Runtime.InteropServices;
  11
  12
  13     /// <devdoc>
  14     ///    <para>Provides access to system timers.</para>
  15     /// </devdoc>
  16     internal sealed class Counter {
  17
  18         /// <devdoc>
  19         ///     not creatable
  20         /// </devdoc>
  21         private Counter() {
  22         }
  23
  24
  25         /// <devdoc>
  26         ///    Gets the current system counter value.
  27         /// </devdoc>
  28         internal static long Value {
  29             get {
  30                 long count = 0;
  31                 SafeNativeMethods.QueryPerformanceCounter(ref count);
  32                 return count;
  33             }
  34         }
  35
  36
  37         /// <devdoc>
  38         ///    Gets the frequency of the system counter in counts per second.
  39         /// </devdoc>
  40         internal static long Frequency {
  41             get {
  42                 long freq = 0;
  43                 SafeNativeMethods.QueryPerformanceFrequency(ref freq);
  44                 return freq;
  45             }
  46         }
  47     }
  48 }