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ReaderWriterLockSlim.WaitingWriteCount Property

Gets the total number of threads that are waiting to enter the lock in write mode.

Namespace:  System.Threading
Assembly:  System.Core (in System.Core.dll)

public int WaitingWriteCount { get; }

Property Value

Type: System.Int32
The total number of threads that are waiting to enter write mode.

Use this property only for debugging, profiling, and logging purposes, and not to control the behavior of an algorithm. The results can change as soon as they have been calculated. Therefore, it is not safe to make decisions based on this property.

The following example shows how to use the WaitingWriteCount property to generate an event log entry if the number of threads that are blocked, waiting to enter write mode, exceeds a threshold.

using (ReaderWriterLockSlim rwLock = new ReaderWriterLockSlim()) {


int waitingWriteCt = rwLock.WaitingWriteCount;
if (waitingWriteCt > WRITE_THRESHOLD)
        "{0} blocked writer threads; exceeds recommended maximum.", 

.NET Framework

Supported in: 4.5, 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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