Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / whidbey / NetFxQFE / ndp / fx / src / xsp / System / Web / Util / SystemInfo.cs / 1 / SystemInfo.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.Util { internal static class SystemInfo { static int _trueNumberOfProcessors; static internal int GetNumProcessCPUs() { if (_trueNumberOfProcessors == 0) { UnsafeNativeMethods.SYSTEM_INFO si; UnsafeNativeMethods.GetSystemInfo(out si); if (si.dwNumberOfProcessors == 1) { _trueNumberOfProcessors = 1; } else { // KERNEL32.DLL:GetCurrentProcess() always returns -1 under NT // Note: not really a handle (no need to CloseHandle()) IntPtr processHandle = UnsafeNativeMethods.INVALID_HANDLE_VALUE; IntPtr processAffinityMask; IntPtr systemAffinityMask; int returnCode = UnsafeNativeMethods.GetProcessAffinityMask( processHandle, out processAffinityMask, out systemAffinityMask); if (returnCode == 0) { _trueNumberOfProcessors = 1; } else { // if cpu affinity is set to a single processor busy waiting is a waste of time int numProcessors = 0; if (IntPtr.Size == 4) { uint mask = (uint) processAffinityMask; for (; mask != 0; mask >>= 1) { if ((mask & 1) == 1) { ++numProcessors; } } } else { ulong mask = (ulong) processAffinityMask; for (; mask != 0; mask >>= 1) { if ((mask & 1) == 1) { ++numProcessors; } } } _trueNumberOfProcessors = numProcessors; } } } Debug.Assert(_trueNumberOfProcessors > 0); return _trueNumberOfProcessors; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.Util { internal static class SystemInfo { static int _trueNumberOfProcessors; static internal int GetNumProcessCPUs() { if (_trueNumberOfProcessors == 0) { UnsafeNativeMethods.SYSTEM_INFO si; UnsafeNativeMethods.GetSystemInfo(out si); if (si.dwNumberOfProcessors == 1) { _trueNumberOfProcessors = 1; } else { // KERNEL32.DLL:GetCurrentProcess() always returns -1 under NT // Note: not really a handle (no need to CloseHandle()) IntPtr processHandle = UnsafeNativeMethods.INVALID_HANDLE_VALUE; IntPtr processAffinityMask; IntPtr systemAffinityMask; int returnCode = UnsafeNativeMethods.GetProcessAffinityMask( processHandle, out processAffinityMask, out systemAffinityMask); if (returnCode == 0) { _trueNumberOfProcessors = 1; } else { // if cpu affinity is set to a single processor busy waiting is a waste of time int numProcessors = 0; if (IntPtr.Size == 4) { uint mask = (uint) processAffinityMask; for (; mask != 0; mask >>= 1) { if ((mask & 1) == 1) { ++numProcessors; } } } else { ulong mask = (ulong) processAffinityMask; for (; mask != 0; mask >>= 1) { if ((mask & 1) == 1) { ++numProcessors; } } } _trueNumberOfProcessors = numProcessors; } } } Debug.Assert(_trueNumberOfProcessors > 0); return _trueNumberOfProcessors; } } } // 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
- ComboBox.cs
- EntityConnection.cs
- FormViewPageEventArgs.cs
- WebScriptMetadataMessage.cs
- FormViewUpdateEventArgs.cs
- ToolStripPanelRow.cs
- LinkedList.cs
- VisualStateManager.cs
- ExtendedTransformFactory.cs
- ExpressionBinding.cs
- EventHandlersStore.cs
- ConstraintStruct.cs
- NamedElement.cs
- ExecutionEngineException.cs
- TemplatePagerField.cs
- Command.cs
- XmlAnyElementAttribute.cs
- InstanceContextMode.cs
- CodeVariableReferenceExpression.cs
- Rotation3DAnimation.cs
- HttpProtocolReflector.cs
- WS2007FederationHttpBindingCollectionElement.cs
- MultiAsyncResult.cs
- SessionEndingEventArgs.cs
- DocumentViewerHelper.cs
- ResourceProviderFactory.cs
- LoginView.cs
- DodSequenceMerge.cs
- isolationinterop.cs
- DataSourceSelectArguments.cs
- InOutArgument.cs
- ScopelessEnumAttribute.cs
- ProtocolReflector.cs
- FontNamesConverter.cs
- DocumentCollection.cs
- wgx_exports.cs
- ObjectConverter.cs
- PeerNameResolver.cs
- ScaleTransform3D.cs
- SortAction.cs
- ClientBuildManagerCallback.cs
- PixelShader.cs
- FlowDocumentPageViewerAutomationPeer.cs
- Schema.cs
- TextEditorThreadLocalStore.cs
- GeneratedCodeAttribute.cs
- SelectionList.cs
- SQLInt64.cs
- XPathSingletonIterator.cs
- XmlWrappingReader.cs
- SoapInteropTypes.cs
- XmlNamespaceMappingCollection.cs
- NamedPipeConnectionPoolSettings.cs
- SynchronizationScope.cs
- EntityTypeBase.cs
- CharacterShapingProperties.cs
- GridViewPageEventArgs.cs
- Point3DKeyFrameCollection.cs
- HtmlControl.cs
- SQLDecimal.cs
- RectAnimationBase.cs
- CompilationRelaxations.cs
- BrushValueSerializer.cs
- LicenseContext.cs
- SortAction.cs
- Point3DAnimation.cs
- RequestContext.cs
- OdbcEnvironment.cs
- LinkUtilities.cs
- MorphHelpers.cs
- Frame.cs
- ContextMenuStrip.cs
- _BufferOffsetSize.cs
- _AutoWebProxyScriptHelper.cs
- PassportIdentity.cs
- CorrelationRequestContext.cs
- PathFigureCollection.cs
- LogFlushAsyncResult.cs
- OpCodes.cs
- CharEnumerator.cs
- ObjectConverter.cs
- List.cs
- JsonQueryStringConverter.cs
- TextTreeObjectNode.cs
- BindableAttribute.cs
- _IPv4Address.cs
- TextEditorMouse.cs
- DataShape.cs
- RegexWorker.cs
- WindowsFormsSynchronizationContext.cs
- MatrixTransform.cs
- DockPanel.cs
- WebPartDeleteVerb.cs
- ItemList.cs
- Documentation.cs
- RemotingSurrogateSelector.cs
- TextPointerBase.cs
- CngKey.cs
- LicenseException.cs
- IndividualDeviceConfig.cs