AsyncReaderWriterLock Class

Artikel
10/10/2013

Microsoft internal only. A non-blocking lock that allows concurrent access, exclusive access, or concurrent access that can be upgraded to exclusive access.

Inheritance Hierarchy

System.Object
Microsoft.VisualStudio.Threading.AsyncReaderWriterLock
Microsoft.VisualStudio.Threading.AsyncReaderWriterResourceLock<TMoniker, TResource>

Namespace: Microsoft.VisualStudio.Threading
Assembly: Microsoft.VisualStudio.Threading (in Microsoft.VisualStudio.Threading.dll)

Syntax

'Declaration
Public Class AsyncReaderWriterLock _
    Implements IHangReportContributor

public class AsyncReaderWriterLock : IHangReportContributor

public ref class AsyncReaderWriterLock : IHangReportContributor

type AsyncReaderWriterLock =  
    class 
        interface IHangReportContributor 
    end

public class AsyncReaderWriterLock implements IHangReportContributor

The AsyncReaderWriterLock type exposes the following members.

Constructors

	Name	Description
	AsyncReaderWriterLock()	Microsoft internal only. Initializes a new instance of AsyncReaderWriterLock.
	AsyncReaderWriterLock(Boolean)	Microsoft internal only. Initializes a new instance of syncReaderWriterLock, specifying whether to spend additional resources on diagnostic details.

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Properties

	Name	Description
	AmbientLock	Microsoft internal only. Gets the lock held by the caller's execution context.
	CaptureDiagnostics	Microsoft internal only. Determines whether additional resources should be spent to collect information that would be useful in diagnosing deadlocks.
	Completion	Microsoft internal only. Gets a task whose completion signals that this lock will no longer issue locks.
	IsAnyLockHeld	Microsoft internal only. Determines whether any kind of lock is held by the caller and can be immediately used given the caller's context.
	IsAnyPassiveLockHeld	Microsoft internal only. Determines whether any kind of lock is held by the caller without regard to the lock compatibility of the caller's context.
	IsPassiveReadLockHeld	Determines whether a read lock is held by the caller without regard to the lock compatibility of the caller's context.
	IsPassiveUpgradeableReadLockHeld	Determines whether an upgradeable read lock is held by the caller without regard to the lock compatibility of the caller's context.
	IsPassiveWriteLockHeld	Determines whether a write lock is held by the caller without regard to the lock compatibility of the caller's context.
	IsReadLockHeld	Microsoft internal only. Determines whether the caller holds a read lock.
	IsUpgradeableReadLockHeld	Microsoft internal only. Determines whether the caller holds an upgradeable read lock.
	IsWriteLockHeld	Microsoft internal only. Determines whether the caller holds a write lock.
	SyncObject	Microsoft internal only. Gets the object used to synchronize access to the fields of this instance.

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Methods

	Name	Description
	Complete	Microsoft internal only. Causes new top-level lock requests to be rejected and the Completion task to transition to a completed state after any issued locks have been released.
	Equals	Determines whether the specified object is equal to the current object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
	GetAggregateLockFlags	Microsoft internal only. Gets the aggregate of the lock flags for all nested locks.
	GetHashCode	Serves as the default hash function. (Inherited from Object.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	HideLocks	Microsoft internal only. Prevents use or visibility of the caller's lock(s) until the returned value is disposed.
	LockStackContains	Microsoft internal only. Checks whether the aggregated flags from all the locks in the lock stack satisfy the specified flag(s).
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	OnBeforeExclusiveLockReleasedAsync	Microsoft internal only. Occurs when the last write lock is about to be released.
	OnBeforeLockReleasedAsync	Microsoft internal only. Occurs when any lock is being released.
	OnBeforeWriteLockReleased	Microsoft internal only. Registers a callback that is invoked when the outermost write lock held by the caller is about to be released.
	OnCriticalFailure(Exception)	Occurs when the lock detects an internal error or illegal usage pattern that indicates a serious flaw that should be immediately reported to the application, while possibly also stopping the process to avoid hangs or data corruption.
	OnCriticalFailure(String)	Occurs when the lock detects an internal error or illegal usage pattern that indicates a serious flaw that should be immediately reported to the application, while possibly also stopping the process to avoid hangs or data corruption.
	OnExclusiveLockReleasedAsync	Microsoft internal only. Occurs after an exclusive lock is released but before any other lock consumer has a chance to enter the lock.
	OnUpgradeableReadLockReleased	Microsoft internal only. Occurs when a top-level upgradeable read lock is released, leaving no remaining (write) lock.
	ReadLockAsync	Microsoft internal only. Gets a read lock, asynchronously awaiting for the lock if it is not immediately available.
	ToString	Returns a string that represents the current object. (Inherited from Object.)
	UpgradeableReadLockAsync(CancellationToken)	Microsoft internal only. Gets a read lock, asynchronously awaiting for the lock if it is not immediately available.
	UpgradeableReadLockAsync(AsyncReaderWriterLock.LockFlags, CancellationToken)	Microsoft internal only. Gets a read lock, asynchronously awaiting for the lock if it is not immediately available.
	WriteLockAsync(CancellationToken)	Microsoft internal only. Gets a write lock, asynchronously awaiting for the lock if it is not immediately available.
	WriteLockAsync(AsyncReaderWriterLock.LockFlags, CancellationToken)	Microsoft internal only. Gets a write lock, asynchronously awaiting for the lock if it is not immediately available.

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Explicit Interface Implementations

	Name	Description
	IHangReportContributor.GetHangReport	Microsoft internal only. data for a hang report.

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Remarks

This class is a custom awaitable rather than a Task{LockReleaser}, because it is necessary to set CallContext data in the context of the entity receiving the lock. To do this the code must be executed at the start of the continuation (whether or not it yields).

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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