nuclex-shared-dotnet/Nuclex.Support
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Attempt to fix a possible bug in the generic time source class which could potentially attempt to construct an instance of System.DateTime with an invalid tick count

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git-svn-id: file:///srv/devel/repo-conversion/nusu@155 d2e56fa2-650e-0410-a79f-9358c0239efd
This commit is contained in:
Markus Ewald 2009-06-24 20:24:21 +00:00
parent 839d46ecf1
commit 5d36825fc8
1 changed files with 9 additions and 11 deletions
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20
Source/Scheduling/GenericTimeSource.cs
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@ -149,34 +149,32 @@ namespace Nuclex.Support.Scheduling {
private void checkForTimeAdjustment() {
// Grab the current date/time and timer ticks in one go
DateTime currentLocalTime = DateTime.Now;
long currentTicks = Ticks;
long currentDateTimeTicks = DateTime.UtcNow.Ticks;
long currentStopwatchTicks = Ticks;
// Calculate the number of timer ticks that have passed since the last check and
// extrapolate the local date/time we should be expecting to see
long ticksSinceLastCheck = currentTicks - lastCheckedTicks;
DateTime expectedLocalTime = new DateTime(
lastCheckedLocalTime.Ticks + ticksSinceLastCheck, DateTimeKind.Local
);
long ticksSinceLastCheck = currentStopwatchTicks - lastCheckedStopwatchTicks;
long expectedLocalTimeTicks = this.lastCheckedDateTimeTicks + ticksSinceLastCheck;
// Find out by what amount the actual local date/time deviates from
// the extrapolated date/time and trigger the date/time adjustment event if
// we can reasonably assume that the system date/time have been adjusted.
long deviationTicks = Math.Abs(expectedLocalTime.Ticks - currentLocalTime.Ticks);
long deviationTicks = Math.Abs(expectedLocalTimeTicks - currentDateTimeTicks);
if(deviationTicks > TimeAdjustmentToleranceTicks) {
OnDateTimeAdjusted(this, EventArgs.Empty);
}
// Remember the current local date/time and timer ticks for the next run
this.lastCheckedLocalTime = currentLocalTime;
this.lastCheckedTicks = currentTicks;
this.lastCheckedDateTimeTicks = currentDateTimeTicks;
this.lastCheckedStopwatchTicks = currentStopwatchTicks;
}
/// <summary>Last local time we checked for a date/time adjustment</summary>
private DateTime lastCheckedLocalTime;
private long lastCheckedDateTimeTicks;
/// <summary>Timer ticks at which we last checked the local time</summary>
private long lastCheckedTicks;
private long lastCheckedStopwatchTicks;
/// <summary>Number of ticks per Stopwatch time unit</summary>
private static double tickFrequency;