ReaderWriterLock.IsWriterLockHeld 属性
定义
获取一个值,该值指示当前线程是否持有写线程锁。Gets a value indicating whether the current thread holds the writer lock.
public:
property bool IsWriterLockHeld { bool get(); };
public bool IsWriterLockHeld { get; }
member this.IsWriterLockHeld : bool
Public ReadOnly Property IsWriterLockHeld As Boolean
属性值
如果当前线程持有写线程锁,则为 true;否则为 false。true if the current thread holds the writer lock; otherwise, false.
示例
下面的代码示例演示当尝试获取具有编写器锁定的线程上的读取器锁时,不 ReaderWriterLock 会授予读取器锁,而是递增写入器锁上的锁计数。The following code example demonstrates that when an attempt is made to acquire a reader lock on a thread that has a writer lock, ReaderWriterLock does not grant the reader lock but instead increments the lock count on the writer lock.
using namespace System;
using namespace System::Threading;
int main()
{
ReaderWriterLock^ rwLock = gcnew ReaderWriterLock;
rwLock->AcquireWriterLock( Timeout::Infinite );
rwLock->AcquireReaderLock( Timeout::Infinite );
if ( rwLock->IsReaderLockHeld )
{
Console::WriteLine( "Reader lock held." );
rwLock->ReleaseReaderLock();
}
else
if ( rwLock->IsWriterLockHeld )
{
Console::WriteLine( "Writer lock held." );
rwLock->ReleaseWriterLock();
}
else
{
Console::WriteLine( "No locks held." );
}
if ( rwLock->IsReaderLockHeld )
{
Console::WriteLine( "Reader lock held." );
rwLock->ReleaseReaderLock();
}
else
if ( rwLock->IsWriterLockHeld )
{
Console::WriteLine( "Writer lock held." );
rwLock->ReleaseWriterLock();
}
else
{
Console::WriteLine( "No locks held." );
}
}
using System;
using System.Threading;
class LockHeld
{
static void Main()
{
ReaderWriterLock rwLock = new ReaderWriterLock();
rwLock.AcquireWriterLock(Timeout.Infinite);
rwLock.AcquireReaderLock(Timeout.Infinite);
if(rwLock.IsReaderLockHeld)
{
Console.WriteLine("Reader lock held.");
rwLock.ReleaseReaderLock();
}
else if(rwLock.IsWriterLockHeld)
{
Console.WriteLine("Writer lock held.");
rwLock.ReleaseWriterLock();
}
else
{
Console.WriteLine("No locks held.");
}
if(rwLock.IsReaderLockHeld)
{
Console.WriteLine("Reader lock held.");
rwLock.ReleaseReaderLock();
}
else if(rwLock.IsWriterLockHeld)
{
Console.WriteLine("Writer lock held.");
rwLock.ReleaseWriterLock();
}
else
{
Console.WriteLine("No locks held.");
}
}
}
Imports System.Threading
Public Class LockHeld
<MTAThread> _
Shared Sub Main()
Dim rwLock As New ReaderWriterLock()
rwLock.AcquireWriterLock(Timeout.Infinite)
rwLock.AcquireReaderLock(Timeout.Infinite)
If rwLock.IsReaderLockHeld Then
Console.WriteLine("Reader lock held.")
rwLock.ReleaseReaderLock()
Else If rwLock.IsWriterLockHeld Then
Console.WriteLine("Writer lock held.")
rwLock.ReleaseWriterLock()
Else
Console.WriteLine("No locks held.")
End If
If rwLock.IsReaderLockHeld Then
Console.WriteLine("Reader lock held.")
rwLock.ReleaseReaderLock()
Else If rwLock.IsWriterLockHeld Then
Console.WriteLine("Writer lock held.")
rwLock.ReleaseWriterLock()
Else
Console.WriteLine("No locks held.")
End If
End Sub
End Class