ReaderWriterLock.ReleaseReaderLock Method ()


Decrements the lock count.

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

public void ReleaseReaderLock()

Exception Condition

The thread does not have any reader or writer locks.

ReleaseReaderLock decrements the lock count. When the count reaches zero, the lock is released.


If a thread has the writer lock, calling ReleaseReaderLock has the same effect as calling ReleaseWriterLock. If a thread has no locks, calling ReleaseReaderLock throws an ApplicationException.

The following code example shows how to acquire and release a reader lock, and how to handle the exception thrown when a request times out.

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

// The complete code is located in the ReaderWriterLock class topic.
using System;
using System.Threading;

public class Example
   static ReaderWriterLock rwl = new ReaderWriterLock();
   // Define the shared resource protected by the ReaderWriterLock.
   static int resource = 0;
// Request and release a reader lock, and handle time-outs.
static void ReadFromResource(int timeOut)
   try {
      try {
         // It is safe for this thread to read from the shared resource.
         Display("reads resource value " + resource);
         Interlocked.Increment(ref reads);
      finally {
         // Ensure that the lock is released.
   catch (ApplicationException) {
      // The reader lock request timed out.
      Interlocked.Increment(ref readerTimeouts);

.NET Framework
Available since 1.1
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