Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / whidbey / NetFXspW7 / ndp / fx / src / Sys / System / Threading / Semaphore.cs / 1 / Semaphore.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== namespace System.Threading { using System.IO; using System.IO.Ports; using Microsoft.Win32; using Microsoft.Win32.SafeHandles; using System.Runtime.InteropServices; using System.Threading; using System.Security.Permissions; #if !FEATURE_PAL using System.Security.AccessControl; #endif using System.Runtime.Versioning; using System.Runtime.ConstrainedExecution; [HostProtection(Synchronization=true, ExternalThreading=true)] [ComVisibleAttribute(false)] public sealed class Semaphore: WaitHandle { private static int MAX_PATH = 260; // creates a nameless semaphore object // Win32 only takes maximum count of Int32.MaxValue [ResourceExposure(ResourceScope.None)] [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)] public Semaphore(int initialCount, int maximumCount) : this(initialCount,maximumCount,null){} [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode)] [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] public Semaphore(int initialCount, int maximumCount, string name) { if (initialCount < 0) { throw new ArgumentOutOfRangeException("initialCount", SR.GetString(SR.ArgumentOutOfRange_NeedNonNegNumRequired)); } if (maximumCount < 1) { throw new ArgumentOutOfRangeException("maximumCount", SR.GetString(SR.ArgumentOutOfRange_NeedNonNegNumRequired)); } if (initialCount > maximumCount) { throw new ArgumentException(SR.GetString(SR.Argument_SemaphoreInitialMaximum)); } if(null != name && MAX_PATH < name.Length) { throw new ArgumentException(SR.GetString(SR.Argument_WaitHandleNameTooLong)); } SafeWaitHandle myHandle = SafeNativeMethods.CreateSemaphore(null, initialCount, maximumCount, name); if (myHandle.IsInvalid) { int errorCode = Marshal.GetLastWin32Error(); if(null != name && 0 != name.Length && NativeMethods.ERROR_INVALID_HANDLE == errorCode) throw new WaitHandleCannotBeOpenedException(SR.GetString(SR.WaitHandleCannotBeOpenedException_InvalidHandle,name)); InternalResources.WinIOError(); } this.SafeWaitHandle = myHandle; } [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode)] [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] public Semaphore(int initialCount, int maximumCount, string name, out bool createdNew) #if !FEATURE_PAL : this(initialCount, maximumCount, name, out createdNew, null) { } [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode)] [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] public unsafe Semaphore(int initialCount, int maximumCount, string name, out bool createdNew, SemaphoreSecurity semaphoreSecurity) #endif { if (initialCount < 0) { throw new ArgumentOutOfRangeException("initialCount", SR.GetString(SR.ArgumentOutOfRange_NeedNonNegNumRequired)); } if (maximumCount < 1) { throw new ArgumentOutOfRangeException("maximumCount", SR.GetString(SR.ArgumentOutOfRange_NeedNonNegNumRequired)); } if (initialCount > maximumCount) { throw new ArgumentException(SR.GetString(SR.Argument_SemaphoreInitialMaximum)); } if(null != name && MAX_PATH < name.Length) { throw new ArgumentException(SR.GetString(SR.Argument_WaitHandleNameTooLong)); } SafeWaitHandle myHandle; #if !FEATURE_PAL // For ACL's, get the security descriptor from the SemaphoreSecurity. if (semaphoreSecurity != null) { NativeMethods.SECURITY_ATTRIBUTES secAttrs = null; secAttrs = new NativeMethods.SECURITY_ATTRIBUTES(); secAttrs.nLength = (int)Marshal.SizeOf(secAttrs); byte[] sd = semaphoreSecurity.GetSecurityDescriptorBinaryForm(); fixed(byte* pSecDescriptor = sd) { secAttrs.lpSecurityDescriptor = new SafeLocalMemHandle((IntPtr) pSecDescriptor, false); myHandle = SafeNativeMethods.CreateSemaphore(secAttrs, initialCount, maximumCount, name); } } else { #endif myHandle = SafeNativeMethods.CreateSemaphore(null, initialCount, maximumCount, name); #if !FEATURE_PAL } #endif int errorCode = Marshal.GetLastWin32Error(); if (myHandle.IsInvalid) { if(null != name && 0 != name.Length && NativeMethods.ERROR_INVALID_HANDLE == errorCode) throw new WaitHandleCannotBeOpenedException(SR.GetString(SR.WaitHandleCannotBeOpenedException_InvalidHandle,name)); InternalResources.WinIOError(); } createdNew = errorCode != NativeMethods.ERROR_ALREADY_EXISTS; this.SafeWaitHandle = myHandle; } private Semaphore(SafeWaitHandle handle) { this.SafeWaitHandle = handle; } [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode)] [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] public static Semaphore OpenExisting(string name) { #if !FEATURE_PAL return OpenExisting(name, SemaphoreRights.Modify | SemaphoreRights.Synchronize); } [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode)] [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] public static Semaphore OpenExisting(string name, SemaphoreRights rights) { #endif // !FEATURE_PAL if (name == null) { throw new ArgumentNullException("name"); } if(name.Length == 0) { throw new ArgumentException(SR.GetString(SR.InvalidNullEmptyArgument, "name"), "name"); } if(null != name && MAX_PATH < name.Length) { throw new ArgumentException(SR.GetString(SR.Argument_WaitHandleNameTooLong)); } //Pass false to OpenSemaphore to prevent inheritedHandles #if FEATURE_PAL SafeWaitHandle myHandle = SafeNativeMethods.OpenSemaphore(Win32Native.SEMAPHORE_MODIFY_STATE | Win32Native.SYNCHRONIZE, false, name); #else SafeWaitHandle myHandle = SafeNativeMethods.OpenSemaphore((int) rights, false, name); #endif if (myHandle.IsInvalid) { int errorCode = Marshal.GetLastWin32Error(); if (NativeMethods.ERROR_FILE_NOT_FOUND == errorCode || NativeMethods.ERROR_INVALID_NAME == errorCode) throw new WaitHandleCannotBeOpenedException(); if (null != name && 0 != name.Length && NativeMethods.ERROR_INVALID_HANDLE == errorCode) throw new WaitHandleCannotBeOpenedException(SR.GetString(SR.WaitHandleCannotBeOpenedException_InvalidHandle,name)); //this is for passed through NativeMethods Errors InternalResources.WinIOError(); } return new Semaphore(myHandle); } // increase the count on a semaphore, returns previous count [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] [PrePrepareMethod] public int Release() { return Release(1); } // increase the count on a semaphore, returns previous count [ResourceExposure(ResourceScope.None)] [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)] [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] public int Release(int releaseCount) { if (releaseCount < 1) { throw new ArgumentOutOfRangeException("releaseCount", SR.GetString(SR.ArgumentOutOfRange_NeedNonNegNumRequired)); } int previousCount; //If ReleaseSempahore returns false when the specified value would cause // the semaphore's count to exceed the maximum count set when Semaphore was created //Non-Zero return if (!SafeNativeMethods.ReleaseSemaphore(SafeWaitHandle, releaseCount, out previousCount)) { throw new SemaphoreFullException(); } return previousCount; } #if !FEATURE_PAL public SemaphoreSecurity GetAccessControl() { return new SemaphoreSecurity(SafeWaitHandle, AccessControlSections.Access | AccessControlSections.Owner | AccessControlSections.Group); } public void SetAccessControl(SemaphoreSecurity semaphoreSecurity) { if (semaphoreSecurity == null) throw new ArgumentNullException("semaphoreSecurity"); semaphoreSecurity.Persist(SafeWaitHandle); } #endif } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== namespace System.Threading { using System.IO; using System.IO.Ports; using Microsoft.Win32; using Microsoft.Win32.SafeHandles; using System.Runtime.InteropServices; using System.Threading; using System.Security.Permissions; #if !FEATURE_PAL using System.Security.AccessControl; #endif using System.Runtime.Versioning; using System.Runtime.ConstrainedExecution; [HostProtection(Synchronization=true, ExternalThreading=true)] [ComVisibleAttribute(false)] public sealed class Semaphore: WaitHandle { private static int MAX_PATH = 260; // creates a nameless semaphore object // Win32 only takes maximum count of Int32.MaxValue [ResourceExposure(ResourceScope.None)] [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)] public Semaphore(int initialCount, int maximumCount) : this(initialCount,maximumCount,null){} [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode)] [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] public Semaphore(int initialCount, int maximumCount, string name) { if (initialCount < 0) { throw new ArgumentOutOfRangeException("initialCount", SR.GetString(SR.ArgumentOutOfRange_NeedNonNegNumRequired)); } if (maximumCount < 1) { throw new ArgumentOutOfRangeException("maximumCount", SR.GetString(SR.ArgumentOutOfRange_NeedNonNegNumRequired)); } if (initialCount > maximumCount) { throw new ArgumentException(SR.GetString(SR.Argument_SemaphoreInitialMaximum)); } if(null != name && MAX_PATH < name.Length) { throw new ArgumentException(SR.GetString(SR.Argument_WaitHandleNameTooLong)); } SafeWaitHandle myHandle = SafeNativeMethods.CreateSemaphore(null, initialCount, maximumCount, name); if (myHandle.IsInvalid) { int errorCode = Marshal.GetLastWin32Error(); if(null != name && 0 != name.Length && NativeMethods.ERROR_INVALID_HANDLE == errorCode) throw new WaitHandleCannotBeOpenedException(SR.GetString(SR.WaitHandleCannotBeOpenedException_InvalidHandle,name)); InternalResources.WinIOError(); } this.SafeWaitHandle = myHandle; } [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode)] [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] public Semaphore(int initialCount, int maximumCount, string name, out bool createdNew) #if !FEATURE_PAL : this(initialCount, maximumCount, name, out createdNew, null) { } [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode)] [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] public unsafe Semaphore(int initialCount, int maximumCount, string name, out bool createdNew, SemaphoreSecurity semaphoreSecurity) #endif { if (initialCount < 0) { throw new ArgumentOutOfRangeException("initialCount", SR.GetString(SR.ArgumentOutOfRange_NeedNonNegNumRequired)); } if (maximumCount < 1) { throw new ArgumentOutOfRangeException("maximumCount", SR.GetString(SR.ArgumentOutOfRange_NeedNonNegNumRequired)); } if (initialCount > maximumCount) { throw new ArgumentException(SR.GetString(SR.Argument_SemaphoreInitialMaximum)); } if(null != name && MAX_PATH < name.Length) { throw new ArgumentException(SR.GetString(SR.Argument_WaitHandleNameTooLong)); } SafeWaitHandle myHandle; #if !FEATURE_PAL // For ACL's, get the security descriptor from the SemaphoreSecurity. if (semaphoreSecurity != null) { NativeMethods.SECURITY_ATTRIBUTES secAttrs = null; secAttrs = new NativeMethods.SECURITY_ATTRIBUTES(); secAttrs.nLength = (int)Marshal.SizeOf(secAttrs); byte[] sd = semaphoreSecurity.GetSecurityDescriptorBinaryForm(); fixed(byte* pSecDescriptor = sd) { secAttrs.lpSecurityDescriptor = new SafeLocalMemHandle((IntPtr) pSecDescriptor, false); myHandle = SafeNativeMethods.CreateSemaphore(secAttrs, initialCount, maximumCount, name); } } else { #endif myHandle = SafeNativeMethods.CreateSemaphore(null, initialCount, maximumCount, name); #if !FEATURE_PAL } #endif int errorCode = Marshal.GetLastWin32Error(); if (myHandle.IsInvalid) { if(null != name && 0 != name.Length && NativeMethods.ERROR_INVALID_HANDLE == errorCode) throw new WaitHandleCannotBeOpenedException(SR.GetString(SR.WaitHandleCannotBeOpenedException_InvalidHandle,name)); InternalResources.WinIOError(); } createdNew = errorCode != NativeMethods.ERROR_ALREADY_EXISTS; this.SafeWaitHandle = myHandle; } private Semaphore(SafeWaitHandle handle) { this.SafeWaitHandle = handle; } [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode)] [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] public static Semaphore OpenExisting(string name) { #if !FEATURE_PAL return OpenExisting(name, SemaphoreRights.Modify | SemaphoreRights.Synchronize); } [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode)] [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] public static Semaphore OpenExisting(string name, SemaphoreRights rights) { #endif // !FEATURE_PAL if (name == null) { throw new ArgumentNullException("name"); } if(name.Length == 0) { throw new ArgumentException(SR.GetString(SR.InvalidNullEmptyArgument, "name"), "name"); } if(null != name && MAX_PATH < name.Length) { throw new ArgumentException(SR.GetString(SR.Argument_WaitHandleNameTooLong)); } //Pass false to OpenSemaphore to prevent inheritedHandles #if FEATURE_PAL SafeWaitHandle myHandle = SafeNativeMethods.OpenSemaphore(Win32Native.SEMAPHORE_MODIFY_STATE | Win32Native.SYNCHRONIZE, false, name); #else SafeWaitHandle myHandle = SafeNativeMethods.OpenSemaphore((int) rights, false, name); #endif if (myHandle.IsInvalid) { int errorCode = Marshal.GetLastWin32Error(); if (NativeMethods.ERROR_FILE_NOT_FOUND == errorCode || NativeMethods.ERROR_INVALID_NAME == errorCode) throw new WaitHandleCannotBeOpenedException(); if (null != name && 0 != name.Length && NativeMethods.ERROR_INVALID_HANDLE == errorCode) throw new WaitHandleCannotBeOpenedException(SR.GetString(SR.WaitHandleCannotBeOpenedException_InvalidHandle,name)); //this is for passed through NativeMethods Errors InternalResources.WinIOError(); } return new Semaphore(myHandle); } // increase the count on a semaphore, returns previous count [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] [PrePrepareMethod] public int Release() { return Release(1); } // increase the count on a semaphore, returns previous count [ResourceExposure(ResourceScope.None)] [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)] [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] public int Release(int releaseCount) { if (releaseCount < 1) { throw new ArgumentOutOfRangeException("releaseCount", SR.GetString(SR.ArgumentOutOfRange_NeedNonNegNumRequired)); } int previousCount; //If ReleaseSempahore returns false when the specified value would cause // the semaphore's count to exceed the maximum count set when Semaphore was created //Non-Zero return if (!SafeNativeMethods.ReleaseSemaphore(SafeWaitHandle, releaseCount, out previousCount)) { throw new SemaphoreFullException(); } return previousCount; } #if !FEATURE_PAL public SemaphoreSecurity GetAccessControl() { return new SemaphoreSecurity(SafeWaitHandle, AccessControlSections.Access | AccessControlSections.Owner | AccessControlSections.Group); } public void SetAccessControl(SemaphoreSecurity semaphoreSecurity) { if (semaphoreSecurity == null) throw new ArgumentNullException("semaphoreSecurity"); semaphoreSecurity.Persist(SafeWaitHandle); } #endif } } // 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
- EqualityArray.cs
- ActivationProxy.cs
- DataGridTablesFactory.cs
- MessageQueueConverter.cs
- ObjectFullSpanRewriter.cs
- GeneralTransform3DGroup.cs
- Internal.cs
- PEFileReader.cs
- PrintDialog.cs
- StringSource.cs
- LocatorManager.cs
- TextEffect.cs
- entityreference_tresulttype.cs
- DataGridTextBox.cs
- DataGridViewCellConverter.cs
- SqlDelegatedTransaction.cs
- BuildManagerHost.cs
- BaseContextMenu.cs
- DataBoundControl.cs
- Timer.cs
- OneOfConst.cs
- __Error.cs
- TimeoutException.cs
- Size3DValueSerializer.cs
- DecimalStorage.cs
- OpCodes.cs
- ModelFunctionTypeElement.cs
- AttributeCollection.cs
- OrderedDictionary.cs
- FindCriteriaElement.cs
- BulletedListEventArgs.cs
- SqlParameter.cs
- Compensation.cs
- TrueReadOnlyCollection.cs
- NullReferenceException.cs
- DataGridViewDataConnection.cs
- GraphicsPath.cs
- JoinGraph.cs
- IsolatedStorageFile.cs
- ExpandoClass.cs
- TypeConverters.cs
- CodeArrayCreateExpression.cs
- SafeWaitHandle.cs
- OdbcConnectionPoolProviderInfo.cs
- WeakRefEnumerator.cs
- KeyBinding.cs
- FrameworkContentElementAutomationPeer.cs
- Behavior.cs
- BatchServiceHost.cs
- PTProvider.cs
- UriWriter.cs
- CombinedGeometry.cs
- _NativeSSPI.cs
- Thread.cs
- ItemsPresenter.cs
- ObjectItemAssemblyLoader.cs
- AutoSizeToolBoxItem.cs
- DataGridViewSelectedCellCollection.cs
- Internal.cs
- MetaModel.cs
- Brush.cs
- HttpCapabilitiesEvaluator.cs
- SynchronizedCollection.cs
- Descriptor.cs
- NamespaceQuery.cs
- WebPartTransformerAttribute.cs
- WebBrowserNavigatedEventHandler.cs
- GridViewEditEventArgs.cs
- WebPartEditorApplyVerb.cs
- ConstraintCollection.cs
- DataObject.cs
- ExpressionConverter.cs
- ToolboxBitmapAttribute.cs
- FloaterParagraph.cs
- fixedPageContentExtractor.cs
- XhtmlBasicLiteralTextAdapter.cs
- DtrList.cs
- XmlCharType.cs
- XmlEntity.cs
- MaterialCollection.cs
- Deflater.cs
- ScrollBarAutomationPeer.cs
- ToolStripControlHost.cs
- DataGridViewCellCollection.cs
- CodeTypeReference.cs
- EdmProviderManifest.cs
- LingerOption.cs
- StrokeNodeOperations2.cs
- CodeTypeParameter.cs
- SqlFlattener.cs
- Query.cs
- DBConcurrencyException.cs
- MetadataWorkspace.cs
- RowBinding.cs
- FillBehavior.cs
- sitestring.cs
- InkCanvas.cs
- TransferRequestHandler.cs
- DbParameterHelper.cs
- DataColumnMapping.cs