Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / whidbey / NetFxQFE / ndp / fx / src / Services / Monitoring / system / Diagnosticts / Stopwatch.cs / 1 / Stopwatch.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== /*============================================================ ** ** Class: Stopwatch ** ** Purpose: Implementation for Stopwatch class. ** ** Date: Nov 27, 2002 ** ===========================================================*/ namespace System.Diagnostics { using Microsoft.Win32; using System; // This class uses high-resolution performance counter if installed hardware // does not support it. Otherwise, the class will fall back to DateTime class // and uses ticks as a measurement. public class Stopwatch { private const long TicksPerMillisecond = 10000; private const long TicksPerSecond = TicksPerMillisecond * 1000; private long elapsed; private long startTimeStamp; private bool isRunning; // "Frequency" stores the frequency of the high-resolution performance counter, // if one exists. Otherwise it will store TicksPerSecond. // The frequency cannot change while the system is running, // so we only need to initialize it once. public static readonly long Frequency; public static readonly bool IsHighResolution; // performance-counter frequency, in counts per ticks. // This can speed up conversion from high frequency performance-counter // to ticks. private static readonly double tickFrequency; static Stopwatch() { bool succeeded = SafeNativeMethods.QueryPerformanceFrequency(out Frequency); if(!succeeded) { IsHighResolution = false; Frequency = TicksPerSecond; tickFrequency = 1; } else { IsHighResolution = true; tickFrequency = TicksPerSecond; tickFrequency /= Frequency; } } public Stopwatch() { Reset(); } public void Start() { // Calling start on a running Stopwatch is a no-op. if(!isRunning) { startTimeStamp = GetTimestamp(); isRunning = true; } } public static Stopwatch StartNew() { Stopwatch s = new Stopwatch(); s.Start(); return s; } public void Stop() { // Calling stop on a stopped Stopwatch is a no-op. if( isRunning) { long endTimeStamp = GetTimestamp(); long elapsedThisPeriod = endTimeStamp - startTimeStamp; elapsed += elapsedThisPeriod; isRunning = false; } } public void Reset() { elapsed = 0; isRunning = false; startTimeStamp = 0; } public bool IsRunning { get { return isRunning; } } public TimeSpan Elapsed { get { return new TimeSpan( GetElapsedDateTimeTicks()); } } public long ElapsedMilliseconds { get { return GetElapsedDateTimeTicks()/TicksPerMillisecond; } } public long ElapsedTicks { get { return GetRawElapsedTicks(); } } public static long GetTimestamp() { if(IsHighResolution) { long timestamp = 0; SafeNativeMethods.QueryPerformanceCounter(out timestamp); return timestamp; } else { return DateTime.UtcNow.Ticks; } } // Get the elapsed ticks. private long GetRawElapsedTicks() { long timeElapsed = elapsed; if( isRunning) { // If the StopWatch is running, add elapsed time since // the Stopwatch is started last time. long currentTimeStamp = GetTimestamp(); long elapsedUntilNow = currentTimeStamp - startTimeStamp; timeElapsed += elapsedUntilNow; } return timeElapsed; } // Get the elapsed ticks. private long GetElapsedDateTimeTicks() { long rawTicks = GetRawElapsedTicks(); if( IsHighResolution) { // convert high resolution perf counter to DateTime ticks double dticks = rawTicks; dticks *= tickFrequency; return unchecked((long)dticks); } else { return rawTicks; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== /*============================================================ ** ** Class: Stopwatch ** ** Purpose: Implementation for Stopwatch class. ** ** Date: Nov 27, 2002 ** ===========================================================*/ namespace System.Diagnostics { using Microsoft.Win32; using System; // This class uses high-resolution performance counter if installed hardware // does not support it. Otherwise, the class will fall back to DateTime class // and uses ticks as a measurement. public class Stopwatch { private const long TicksPerMillisecond = 10000; private const long TicksPerSecond = TicksPerMillisecond * 1000; private long elapsed; private long startTimeStamp; private bool isRunning; // "Frequency" stores the frequency of the high-resolution performance counter, // if one exists. Otherwise it will store TicksPerSecond. // The frequency cannot change while the system is running, // so we only need to initialize it once. public static readonly long Frequency; public static readonly bool IsHighResolution; // performance-counter frequency, in counts per ticks. // This can speed up conversion from high frequency performance-counter // to ticks. private static readonly double tickFrequency; static Stopwatch() { bool succeeded = SafeNativeMethods.QueryPerformanceFrequency(out Frequency); if(!succeeded) { IsHighResolution = false; Frequency = TicksPerSecond; tickFrequency = 1; } else { IsHighResolution = true; tickFrequency = TicksPerSecond; tickFrequency /= Frequency; } } public Stopwatch() { Reset(); } public void Start() { // Calling start on a running Stopwatch is a no-op. if(!isRunning) { startTimeStamp = GetTimestamp(); isRunning = true; } } public static Stopwatch StartNew() { Stopwatch s = new Stopwatch(); s.Start(); return s; } public void Stop() { // Calling stop on a stopped Stopwatch is a no-op. if( isRunning) { long endTimeStamp = GetTimestamp(); long elapsedThisPeriod = endTimeStamp - startTimeStamp; elapsed += elapsedThisPeriod; isRunning = false; } } public void Reset() { elapsed = 0; isRunning = false; startTimeStamp = 0; } public bool IsRunning { get { return isRunning; } } public TimeSpan Elapsed { get { return new TimeSpan( GetElapsedDateTimeTicks()); } } public long ElapsedMilliseconds { get { return GetElapsedDateTimeTicks()/TicksPerMillisecond; } } public long ElapsedTicks { get { return GetRawElapsedTicks(); } } public static long GetTimestamp() { if(IsHighResolution) { long timestamp = 0; SafeNativeMethods.QueryPerformanceCounter(out timestamp); return timestamp; } else { return DateTime.UtcNow.Ticks; } } // Get the elapsed ticks. private long GetRawElapsedTicks() { long timeElapsed = elapsed; if( isRunning) { // If the StopWatch is running, add elapsed time since // the Stopwatch is started last time. long currentTimeStamp = GetTimestamp(); long elapsedUntilNow = currentTimeStamp - startTimeStamp; timeElapsed += elapsedUntilNow; } return timeElapsed; } // Get the elapsed ticks. private long GetElapsedDateTimeTicks() { long rawTicks = GetRawElapsedTicks(); if( IsHighResolution) { // convert high resolution perf counter to DateTime ticks double dticks = rawTicks; dticks *= tickFrequency; return unchecked((long)dticks); } else { return rawTicks; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- WindowsSysHeader.cs
- BatchStream.cs
- CodeAttributeDeclaration.cs
- LightweightCodeGenerator.cs
- ConnectionOrientedTransportChannelListener.cs
- StylusTouchDevice.cs
- ConfigurationLocationCollection.cs
- BamlResourceContent.cs
- WebPartZone.cs
- KnowledgeBase.cs
- WeakReadOnlyCollection.cs
- ToolBar.cs
- PermissionAttributes.cs
- QueryPageSettingsEventArgs.cs
- ListContractAdapter.cs
- _ListenerAsyncResult.cs
- DesigntimeLicenseContextSerializer.cs
- XmlSchemaAll.cs
- BuildProvider.cs
- NumberSubstitution.cs
- TargetException.cs
- ExpandCollapseProviderWrapper.cs
- MatrixStack.cs
- ExecutionProperties.cs
- ComboBoxAutomationPeer.cs
- SqlTransaction.cs
- EventLogger.cs
- DataBoundControlAdapter.cs
- NonPrimarySelectionGlyph.cs
- RegexCompiler.cs
- RequestCache.cs
- DPTypeDescriptorContext.cs
- IdnMapping.cs
- ReferencedAssembly.cs
- SupportingTokenBindingElement.cs
- Invariant.cs
- FileAuthorizationModule.cs
- RealizationDrawingContextWalker.cs
- TextChange.cs
- DefaultMemberAttribute.cs
- Processor.cs
- InstanceDescriptor.cs
- BamlRecordReader.cs
- VisualTreeHelper.cs
- XmlIterators.cs
- QueryConverter.cs
- RectangleConverter.cs
- Pen.cs
- ImageClickEventArgs.cs
- RNGCryptoServiceProvider.cs
- ChildrenQuery.cs
- SlotInfo.cs
- DetailsView.cs
- DelegateOutArgument.cs
- DockAndAnchorLayout.cs
- InstanceStore.cs
- InfoCardAsymmetricCrypto.cs
- Int64.cs
- Mappings.cs
- TrackingWorkflowEventArgs.cs
- ColorMap.cs
- NativeBuffer.cs
- ComplexPropertyEntry.cs
- HostingPreferredMapPath.cs
- ColorBlend.cs
- StrongNameKeyPair.cs
- StreamMarshaler.cs
- SlipBehavior.cs
- TreeViewTemplateSelector.cs
- FontUnitConverter.cs
- Common.cs
- _SecureChannel.cs
- DataGridTableCollection.cs
- DbInsertCommandTree.cs
- StylusEditingBehavior.cs
- CapabilitiesRule.cs
- SizeChangedInfo.cs
- TextViewBase.cs
- Label.cs
- WSTrustDec2005.cs
- ServiceOperationInfoTypeConverter.cs
- ErrorTableItemStyle.cs
- ObjectTokenCategory.cs
- ObjectListShowCommandsEventArgs.cs
- XsdBuildProvider.cs
- DataGridItem.cs
- wgx_commands.cs
- QueryOutputWriter.cs
- FrameAutomationPeer.cs
- SqlCacheDependencyDatabaseCollection.cs
- XmlSubtreeReader.cs
- OletxTransactionManager.cs
- ReadContentAsBinaryHelper.cs
- SchemaImporterExtensionElementCollection.cs
- HtmlTableCellCollection.cs
- StreamFormatter.cs
- AxisAngleRotation3D.cs
- FlowDocumentScrollViewerAutomationPeer.cs
- DataPointer.cs
- EventWaitHandleSecurity.cs