ExitWriteLock Method

ReaderWriterLockSlim.ExitWriteLock Method ()

 

Reduces the recursion count for write mode, and exits write mode if the resulting count is 0 (zero).

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

public void ExitWriteLock()

Exception Condition
SynchronizationLockException

The current thread has not entered the lock in write mode.

This method is not sensitive to recursion order. For example, if a thread enters a lock in upgradeable mode and then enters the lock in write mode, the order in which the thread exits the two modes does not matter. If a lock allows recursion, a thread can enter the lock in write mode and then enter it recursively in read mode; the order in which the thread exits read mode and write mode does not matter.

Exiting the lock might signal other waiting threads.

The following example shows how to use a finally block to execute the ExitWriteLock method, ensuring that the caller exits write mode. The method shown in the example adds a new key/value pair to the synchronized cache. If the key is already in the cache, the exception thrown by the inner Dictionary<TKey, TValue> is allowed to terminate the method. The EnterWriteLock method is used to enter the lock in write mode.

This code is part of a larger example provided for the ReaderWriterLockSlim class.

private ReaderWriterLockSlim cacheLock = new ReaderWriterLockSlim();
private Dictionary<int, string> innerCache = new Dictionary<int, string>();
public void Add(int key, string value)
{
    cacheLock.EnterWriteLock();
    try
    {
        innerCache.Add(key, value);
    }
    finally
    {
        cacheLock.ExitWriteLock();
    }
}

Universal Windows Platform
Available since 8
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1
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