ReaderWriterLock.ReleaseWriterLock 方法
减少写线程锁上的锁计数。
**命名空间:**System.Threading
**程序集:**mscorlib(在 mscorlib.dll 中)
语法
声明
Public Sub ReleaseWriterLock
用法
Dim instance As ReaderWriterLock
instance.ReleaseWriterLock
public void ReleaseWriterLock ()
public:
void ReleaseWriterLock ()
public void ReleaseWriterLock ()
public function ReleaseWriterLock ()
异常
异常类型 | 条件 |
---|---|
线程没有写线程锁。 |
备注
ReleaseWriterLock 将减少写线程锁计数。计数变为零时释放写线程锁。
提示
如果线程持有读线程锁或没有锁,调用 ReleaseWriterLock 会引发 ApplicationException。
示例
' The complete code is located in the ReaderWriterLock
' class topic.
Imports System
Imports System.Threading
Imports Microsoft.VisualBasic
Public Class Test
' Declaring the ReaderWriterLock at the class level
' makes it visible to all threads.
Private Shared rwl As New ReaderWriterLock()
' For this example, the shared resource protected by the
' ReaderWriterLock is just an integer.
Private Shared resource As Integer = 0
...
' Shows how to request and release the writer lock, and
' how to handle time-outs.
Shared Sub WriteToResource(timeOut As Integer)
Try
rwl.AcquireWriterLock(timeOut)
Try
' It is safe for this thread to read or write
' from the shared resource.
resource = rnd.Next(500)
Display("writes resource value " & resource)
Interlocked.Increment(writes)
Finally
' Ensure that the lock is released.
rwl.ReleaseWriterLock()
End Try
Catch ex As ApplicationException
' The writer lock request timed out.
Interlocked.Increment(writerTimeouts)
End Try
End Sub 'WriteToResource
...
End Class 'Test
// The complete code is located in the ReaderWriterLock
// class topic.
using System;
using System.Threading;
public class Test
{
// Declaring the ReaderWriterLock at the class level
// makes it visible to all threads.
static ReaderWriterLock rwl = new 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 the writer lock, and
// how to handle time-outs.
static void WriteToResource(int timeOut)
{
try
{
rwl.AcquireWriterLock(timeOut);
try
{
// It is safe for this thread to read or write
// from the shared resource.
resource = rnd.Next(500);
Display("writes resource value " + resource);
Interlocked.Increment(ref writes);
}
finally
{
// Ensure that the lock is released.
rwl.ReleaseWriterLock();
}
}
catch (ApplicationException)
{
// The writer lock request timed out.
Interlocked.Increment(ref writerTimeouts);
}
}
...
}
// 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 the writer lock, and
// how to handle time-outs.
static void WriteToResource( int timeOut )
{
try
{
rwl->AcquireWriterLock( timeOut );
try
{
// It is safe for this thread to read or write
// from the shared resource.
resource = rnd->Next( 500 );
Display( String::Format( "writes resource value {0}", resource ) );
Interlocked::Increment( writes );
}
finally
{
// Ensure that the lock is released.
rwl->ReleaseWriterLock();
}
}
catch ( ApplicationException^ )
{
// The writer lock request timed out.
Interlocked::Increment( writerTimeouts );
}
}
...
};
// The complete code is located in the ReaderWriterLock
// class topic.
import System.*;
import System.Threading.*;
import System.Threading.Thread;
public class Test
{
// Declaring the ReaderWriterLock at the class level
// makes it visible to all threads.
private static ReaderWriterLock rwl = new ReaderWriterLock();
// For this example, the shared resource protected by the
// ReaderWriterLock is just an integer.
private static int resource = 0;
...
// Shows how to request and release the writer lock, and
// how to handle time-outs.
static void WriteToResource(int timeOut)
{
try {
rwl.AcquireWriterLock(timeOut);
try {
// It is safe for this thread to read or write
// from the shared resource.
resource = rnd.Next(500);
Display(("writes resource value " + resource));
Interlocked.Increment(writes);
}
finally {
// Ensure that the lock is released.
rwl.ReleaseWriterLock();
}
}
catch (ApplicationException exp) {
// The writer lock request timed out.
Interlocked.Increment(writerTimeouts);
}
} //WriteToResource
...
}
平台
Windows 98、Windows 2000 SP4、Windows Millennium Edition、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition
.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表,请参见系统要求。
版本信息
.NET Framework
受以下版本支持:2.0、1.1、1.0
请参见
参考
ReaderWriterLock 类
ReaderWriterLock 成员
System.Threading 命名空间