ReaderWriterLock.ReleaseReaderLock Method

Definition

Namespace:

System.Threading

Assembly:

System.Threading.dll

Source:

ReaderWriterLock.cs

Decrements the lock count.

public void ReleaseReaderLock ();

Exceptions

ApplicationException

The thread does not have any reader or writer locks.

Examples

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 {
      rwl.AcquireReaderLock(timeOut);
      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.
         rwl.ReleaseReaderLock();
      }
   }
   catch (ApplicationException) {
      // The reader lock request timed out.
      Interlocked.Increment(ref readerTimeouts);
   }
}

}

Remarks

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

Nota

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.

Applies to

See also

• Managed Threading
• ReaderWriterLock