ReaderWriterLock.ReleaseReaderLock 方法
定义
重要
一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。 对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。
减少锁计数。
public:
void ReleaseReaderLock();public void ReleaseReaderLock();member this.ReleaseReaderLock : unit -> unitPublic Sub ReleaseReaderLock ()例外
线程没有任何读取器或编写器锁。
示例
下面的代码示例演示如何获取和释放读取器锁，以及如何处理请求超时时引发的异常。
此代码是为类提供的大型示例的 ReaderWriterLock 一部分。
// 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;
' The complete code is located in the ReaderWriterLock class topic.
Imports System.Threading
Public Module Example
Private rwl As New ReaderWriterLock()
' Define the shared resource protected by the ReaderWriterLock.
Private resource As Integer = 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);
}
}
' Request and release a reader lock, and handle time-outs.
Sub ReadFromResource(timeOut As Integer)
Try
rwl.AcquireReaderLock(timeOut)
Try
' It's safe for this thread to read from the shared resource.
Display("reads resource value " & resource)
Interlocked.Increment(reads)
Finally
' Ensure that the lock is released.
rwl.ReleaseReaderLock()
End Try
Catch ex As ApplicationException
' The reader lock request timed out.
Interlocked.Increment(readerTimeouts)
End Try
End Sub
}
End Module
注解
ReleaseReaderLock 递减锁计数。 当计数达到零时，将释放锁。
Note
如果线程具有编写器锁，则调用 ReleaseReaderLock 的效果与调用 ReleaseWriterLock的效果相同。 如果线程没有锁，则调用 ReleaseReaderLock 将引发一个 ApplicationException。
