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ReaderWriterLock::ReleaseReaderLock Method ()
.NET Framework (current version)
Decrements the lock count.
Assembly: mscorlib (in mscorlib.dll)
| Exception | Condition |
|---|---|
| ApplicationException | The thread does not have any reader or writer locks. |
ReleaseReaderLock decrements the lock count. When the count reaches zero, the lock is released.
 Note |
|---|
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 namespace System; using namespace System::Threading; public ref class Test { public: // Declaring the ReaderWriterLock at the class level // makes it visible to all threads. static ReaderWriterLock^ rwl = gcnew ReaderWriterLock; // For this example, the shared resource protected by the // ReaderWriterLock is just an integer. static int resource = 0;
// Shows how to request and release a reader lock, and // how to 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( String::Format( "reads resource value {0}", resource ) ); Interlocked::Increment( reads ); } finally { // Ensure that the lock is released. rwl->ReleaseReaderLock(); } } catch ( ApplicationException^ ) { // The reader lock request timed out. Interlocked::Increment( readerTimeouts ); } }
.NET Framework
Available since 1.1
Available since 1.1
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