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
- LocalizedNameDescriptionPair.cs
- SafeSystemMetrics.cs
- RawStylusInputCustomData.cs
- CommonRemoteMemoryBlock.cs
- GlyphingCache.cs
- Int64Storage.cs
- SessionStateItemCollection.cs
- HttpProfileGroupBase.cs
- ProvidePropertyAttribute.cs
- PatternMatcher.cs
- streamingZipPartStream.cs
- XPathSingletonIterator.cs
- XpsFilter.cs
- XmlDataImplementation.cs
- WebConfigurationFileMap.cs
- PropagatorResult.cs
- PageCache.cs
- BooleanToVisibilityConverter.cs
- TraceRecords.cs
- ViewCellSlot.cs
- DynamicAttribute.cs
- DataMember.cs
- StreamGeometryContext.cs
- DataIdProcessor.cs
- OracleParameterBinding.cs
- SmiEventSink_DeferedProcessing.cs
- SurrogateEncoder.cs
- TcpConnectionPoolSettingsElement.cs
- TypeUnloadedException.cs
- StringOutput.cs
- HtmlElementErrorEventArgs.cs
- ObjectDataSourceDisposingEventArgs.cs
- SerializerWriterEventHandlers.cs
- ComEventsHelper.cs
- PropertyDescriptor.cs
- WebPartConnectionsEventArgs.cs
- SortQueryOperator.cs
- ErrorHandlerFaultInfo.cs
- BamlResourceContent.cs
- TemplateParser.cs
- OleDbWrapper.cs
- DaylightTime.cs
- RegexMatchCollection.cs
- RadioButtonRenderer.cs
- BitStream.cs
- FunctionMappingTranslator.cs
- SchemaImporterExtension.cs
- GenericsInstances.cs
- DateTimeParse.cs
- DataGridItemEventArgs.cs
- TextTrailingWordEllipsis.cs
- PeerNameRecordCollection.cs
- DetailsViewDeleteEventArgs.cs
- DecoderFallbackWithFailureFlag.cs
- ConfigXmlWhitespace.cs
- SmtpReplyReaderFactory.cs
- DataViewSettingCollection.cs
- MailWebEventProvider.cs
- ItemCheckedEvent.cs
- RC2.cs
- WebBrowserDocumentCompletedEventHandler.cs
- DataGridViewRowCollection.cs
- SelectionHighlightInfo.cs
- ResXFileRef.cs
- Section.cs
- TableAdapterManagerMethodGenerator.cs
- DocumentViewerConstants.cs
- KnownBoxes.cs
- Util.cs
- StylusPointProperties.cs
- SystemIPInterfaceProperties.cs
- WindowsProgressbar.cs
- WebConvert.cs
- LassoHelper.cs
- XmlSchemaAttributeGroup.cs
- SHA256.cs
- PagerStyle.cs
- PolicyLevel.cs
- PageThemeCodeDomTreeGenerator.cs
- SmiEventSink_Default.cs
- RegexWriter.cs
- PrimitiveSchema.cs
- _HTTPDateParse.cs
- WebConfigurationFileMap.cs
- ContainerFilterService.cs
- BamlResourceContent.cs
- SyndicationElementExtension.cs
- LinkButton.cs
- Panel.cs
- ConstrainedDataObject.cs
- CompoundFileDeflateTransform.cs
- UpdateExpressionVisitor.cs
- _AutoWebProxyScriptEngine.cs
- ToolStripMenuItemDesigner.cs
- EntitySetBase.cs
- Model3DGroup.cs
- ServiceInstanceProvider.cs
- RuleInfoComparer.cs
- NativeMethods.cs
- Attributes.cs