ReaderWriterLock.IsReaderLockHeld Proprietà
Importante
Alcune informazioni sono relative alla release non definitiva del prodotto, che potrebbe subire modifiche significative prima della release definitiva. Microsoft non riconosce alcuna garanzia, espressa o implicita, in merito alle informazioni qui fornite.
Ottiene un valore che indica se il thread corrente è responsabile di un blocco del lettore.
public:
property bool IsReaderLockHeld { bool get(); };
public bool IsReaderLockHeld { get; }
member this.IsReaderLockHeld : bool
Public ReadOnly Property IsReaderLockHeld As Boolean
true
se il thread corrente è responsabile del blocco del lettore; in caso contrario, false
.
Nell'esempio di codice seguente viene illustrato come usare IsReaderLockHeld
per evitare deadlock.
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
Prodotto | Versioni |
---|---|
.NET | Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 2.0, 2.1 |
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