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
- NetworkInterface.cs
- ScrollEvent.cs
- SocketManager.cs
- FieldBuilder.cs
- FileLoadException.cs
- Zone.cs
- ISAPIApplicationHost.cs
- SqlTypeConverter.cs
- DesignerHierarchicalDataSourceView.cs
- ServiceContractGenerator.cs
- MatcherBuilder.cs
- NumberAction.cs
- QueryAccessibilityHelpEvent.cs
- ErrorsHelper.cs
- InvalidComObjectException.cs
- TemplatedWizardStep.cs
- FlowLayoutPanel.cs
- DataListItemCollection.cs
- ProfileEventArgs.cs
- BookmarkScopeManager.cs
- HeaderCollection.cs
- DataPagerFieldCollection.cs
- MessageContractAttribute.cs
- ResolveCriteriaApril2005.cs
- SelectionList.cs
- RemoteCryptoTokenProvider.cs
- SimpleBitVector32.cs
- DataBoundControlHelper.cs
- SelectionPatternIdentifiers.cs
- DataBindingList.cs
- EntityRecordInfo.cs
- LogicalCallContext.cs
- VisualStyleElement.cs
- OdbcTransaction.cs
- XmlDsigSep2000.cs
- CommandHelpers.cs
- TextOutput.cs
- ExceptionDetail.cs
- Point3DIndependentAnimationStorage.cs
- DESCryptoServiceProvider.cs
- GenericPrincipal.cs
- CodeMethodInvokeExpression.cs
- FixedDocument.cs
- Tokenizer.cs
- TextTreeObjectNode.cs
- ObjectParameterCollection.cs
- ProcessInfo.cs
- EmissiveMaterial.cs
- ConfigViewGenerator.cs
- WebPartConnectionsConnectVerb.cs
- TraceHandler.cs
- manifestimages.cs
- TextBoxView.cs
- ClosureBinding.cs
- LongPath.cs
- LockingPersistenceProvider.cs
- ContainerFilterService.cs
- DBCSCodePageEncoding.cs
- FacetDescriptionElement.cs
- BitStream.cs
- TreeViewImageKeyConverter.cs
- SqlWorkflowInstanceStore.cs
- DbException.cs
- bidPrivateBase.cs
- NativeMethods.cs
- TaiwanCalendar.cs
- DataBindingList.cs
- OptimalBreakSession.cs
- StateInitializationDesigner.cs
- ExecutionContext.cs
- Base64Encoder.cs
- ZeroOpNode.cs
- CodeNamespaceImportCollection.cs
- CharacterHit.cs
- DataColumnPropertyDescriptor.cs
- JapaneseLunisolarCalendar.cs
- FontInfo.cs
- PersonalizableAttribute.cs
- TemplatedWizardStep.cs
- StylusSystemGestureEventArgs.cs
- DataTransferEventArgs.cs
- InheritanceService.cs
- HttpProfileBase.cs
- XmlSchemaCollection.cs
- ManagementEventWatcher.cs
- WebPartZoneCollection.cs
- SchemaDeclBase.cs
- SplayTreeNode.cs
- MarkupCompiler.cs
- altserialization.cs
- ImageUrlEditor.cs
- NullReferenceException.cs
- ProviderUtil.cs
- Floater.cs
- EmptyElement.cs
- SerializationSectionGroup.cs
- XPathItem.cs
- DbDataRecord.cs
- ClientApiGenerator.cs
- SecurityPolicySection.cs