AbandonedMutexException Clase

Definición

Excepción que se produce cuando un subproceso adquiere un objeto Mutex que otro subproceso ha abandonado al salir sin liberarlo.The exception that is thrown when one thread acquires a Mutex object that another thread has abandoned by exiting without releasing it.

public ref class AbandonedMutexException : Exception
public ref class AbandonedMutexException : SystemException
public class AbandonedMutexException : Exception
public class AbandonedMutexException : SystemException
[System.Runtime.InteropServices.ComVisible(false)]
[System.Serializable]
public class AbandonedMutexException : SystemException
type AbandonedMutexException = class
    inherit Exception
type AbandonedMutexException = class
    inherit SystemException
[<System.Runtime.InteropServices.ComVisible(false)>]
[<System.Serializable>]
type AbandonedMutexException = class
    inherit SystemException
Public Class AbandonedMutexException
Inherits Exception
Public Class AbandonedMutexException
Inherits SystemException
Herencia
AbandonedMutexException
Herencia
AbandonedMutexException
Atributos

Ejemplos

En el ejemplo de código siguiente se ejecuta un subproceso que abandona cinco exclusiones mutuas, lo que muestra sus efectos en los WaitOne WaitAny métodos, y WaitAll .The following code example executes a thread that abandons five mutexes, demonstrating their effects on the WaitOne, WaitAny, and WaitAll methods. El valor de la MutexIndex propiedad se muestra para la WaitAny llamada.The value of the MutexIndex property is displayed for the WaitAny call.

Nota

WaitAnyUna de las exclusiones mutuas abandonadas interrumpe la llamada al método.The call to the WaitAny method is interrupted by one of the abandoned mutexes. La otra exclusión mutua abandonada podría seguir provocando AbandonedMutexException que los métodos de espera subsiguientes inicien una.The other abandoned mutex could still cause an AbandonedMutexException to be thrown by subsequent wait methods.

using namespace System;
using namespace System::Threading;

namespace SystemThreadingExample
{
    public ref class Example
    {
    private:
        static ManualResetEvent^ dummyEvent = 
            gcnew ManualResetEvent(false);
            
        static Mutex^ orphanMutex1 = gcnew Mutex;
        static Mutex^ orphanMutex2 = gcnew Mutex;
        static Mutex^ orphanMutex3 = gcnew Mutex;
        static Mutex^ orphanMutex4 = gcnew Mutex;
        static Mutex^ orphanMutex5 = gcnew Mutex;
        
    public:
        static void ProduceAbandonMutexException(void)
        {
            
            // Start a thread that grabs all five mutexes, and then
            // abandons them.
            Thread^ abandonThread = 
                gcnew Thread(gcnew ThreadStart(AbandonMutex));

            abandonThread->Start();
            
            // Make sure the thread is finished.
            abandonThread->Join();
            
            // Wait on one of the abandoned mutexes. The WaitOne
            // throws an AbandonedMutexException.
            try
            {
                orphanMutex1->WaitOne();
                Console::WriteLine("WaitOne succeeded.");
            }
            catch (AbandonedMutexException^ ex) 
            {
                Console::WriteLine("Exception in WaitOne: {0}", 
                    ex->Message);
            }
            finally
            {
                
                // Whether or not the exception was thrown, 
                // the current thread owns the mutex, and 
                // must release it.
                orphanMutex1->ReleaseMutex();
            }

            
            // Create an array of wait handles, consisting of one
            // ManualResetEvent and two mutexes, using two more of
            // the abandoned mutexes.
            array <WaitHandle^>^ waitFor = {dummyEvent, 
                orphanMutex2, orphanMutex3};
            
            // WaitAny returns when any of the wait handles in the 
            // array is signaled. Either of the two abandoned mutexes
            // satisfy the wait, but lower of the two index values is
            // returned by MutexIndex. Note that the Try block and
            // the Catch block obtain the index in different ways.
            try
            {
                int index = WaitHandle::WaitAny(waitFor);
                Console::WriteLine("WaitAny succeeded.");
                (safe_cast<Mutex^>(waitFor[index]))->ReleaseMutex();
            }
            catch (AbandonedMutexException^ ex) 
            {
                Console::WriteLine("Exception in WaitAny at index {0}"
                    "\r\n\tMessage: {1}", ex->MutexIndex, 
                    ex->Message);
                (safe_cast<Mutex^>(waitFor[ex->MutexIndex]))->
                    ReleaseMutex();
            }

            orphanMutex3->ReleaseMutex();
            
            // Use two more of the abandoned mutexes for the WaitAll 
            // call. WaitAll doesn't return until all wait handles 
            // are signaled, so the ManualResetEvent must be signaled 
            // by calling Set().
            dummyEvent->Set();
            waitFor[1] = orphanMutex4;
            waitFor[2] = orphanMutex5;
            
            // Because WaitAll requires all the wait handles to be
            // signaled, both mutexes must be released even if the
            // exception is thrown. Thus, the ReleaseMutex calls are 
            // placed in the Finally block. Again, MutexIndex returns
            // the lower of the two index values for the abandoned
            // mutexes.
            //  
            try
            {
                WaitHandle::WaitAll(waitFor);
                Console::WriteLine("WaitAll succeeded.");
            }
            catch (AbandonedMutexException^ ex) 
            {
                Console::WriteLine("Exception in WaitAny at index {0}"
                    "\r\n\tMessage: {1}", ex->MutexIndex, 
                    ex->Message);
            }
            finally
            {
                orphanMutex4->ReleaseMutex();
                orphanMutex5->ReleaseMutex();
            }

        }


    private:
        [MTAThread]
        static void AbandonMutex()
        {
            orphanMutex1->WaitOne();
            orphanMutex2->WaitOne();
            orphanMutex3->WaitOne();
            orphanMutex4->WaitOne();
            orphanMutex5->WaitOne();
            Console::WriteLine(
                "Thread exits without releasing the mutexes.");
        }
    };   
}

//Entry point of example application
[MTAThread]
int main(void)
{
    SystemThreadingExample::Example::ProduceAbandonMutexException();
}

// This code example produces the following output:
// Thread exits without releasing the mutexes.
// Exception in WaitOne: The wait completed due to an abandoned mutex.
// Exception in WaitAny at index 1
//         Message: The wait completed due to an abandoned mutex.
// Exception in WaitAll at index -1
//         Message: The wait completed due to an abandoned mutex.


using System;
using System.Threading;

public class Example
{
    private static ManualResetEvent _dummy = new ManualResetEvent(false);

    private static Mutex _orphan1 = new Mutex();
    private static Mutex _orphan2 = new Mutex();
    private static Mutex _orphan3 = new Mutex();
    private static Mutex _orphan4 = new Mutex();
    private static Mutex _orphan5 = new Mutex();

    [MTAThread]
    public static void Main()
    {
        // Start a thread that takes all five mutexes, and then
        // ends without releasing them.
        //
        Thread t = new Thread(new ThreadStart(AbandonMutex));
        t.Start();
        // Make sure the thread is finished.
        t.Join();

        // Wait on one of the abandoned mutexes. The WaitOne returns
        // immediately, because its wait condition is satisfied by
        // the abandoned mutex, but on return it throws
        // AbandonedMutexException.
        try
        {
            _orphan1.WaitOne();
            Console.WriteLine("WaitOne succeeded.");
        }
        catch(AbandonedMutexException ex)
        {
            Console.WriteLine("Exception on return from WaitOne." +
                "\r\n\tMessage: {0}", ex.Message);
        }
        finally
        {
            // Whether or not the exception was thrown, the current
            // thread owns the mutex, and must release it.
            //
            _orphan1.ReleaseMutex();
        }

        // Create an array of wait handles, consisting of one
        // ManualResetEvent and two mutexes, using two more of the
        // abandoned mutexes.
        WaitHandle[] waitFor = {_dummy, _orphan2, _orphan3};

        // WaitAny returns when any of the wait handles in the 
        // array is signaled, so either of the two abandoned mutexes
        // satisfy its wait condition. On returning from the wait,
        // WaitAny throws AbandonedMutexException. The MutexIndex
        // property returns the lower of the two index values for 
        // the abandoned mutexes. Note that the Try block and the
        // Catch block obtain the index in different ways.
        //  
        try
        {
            int index = WaitHandle.WaitAny(waitFor);
            Console.WriteLine("WaitAny succeeded.");

            // The current thread owns the mutex, and must release
            // it.
            Mutex m = waitFor[index] as Mutex;
            if (m != null) m.ReleaseMutex();
        }
        catch(AbandonedMutexException ex)
        {
            Console.WriteLine("Exception on return from WaitAny at index {0}." +
                "\r\n\tMessage: {1}", ex.MutexIndex, ex.Message);

            // Whether or not the exception was thrown, the current
            // thread owns the mutex, and must release it.
            //
            if (ex.Mutex != null) ex.Mutex.ReleaseMutex();
        }

        // Use two more of the abandoned mutexes for the WaitAll call.
        // WaitAll doesn't return until all wait handles are signaled,
        // so the ManualResetEvent must be signaled by calling Set().
        _dummy.Set();
        waitFor[1] = _orphan4;
        waitFor[2] = _orphan5;

        // The signaled event and the two abandoned mutexes satisfy
        // the wait condition for WaitAll, but on return it throws
        // AbandonedMutexException. For WaitAll, the MutexIndex
        // property is always -1 and the Mutex property is always
        // null.
        //  
        try
        {
            WaitHandle.WaitAll(waitFor);
            Console.WriteLine("WaitAll succeeded.");
        }
        catch(AbandonedMutexException ex)
        {
            Console.WriteLine("Exception on return from WaitAll. MutexIndex = {0}." +
                "\r\n\tMessage: {1}", ex.MutexIndex, ex.Message);
        }
        finally
        {
            // Whether or not the exception was thrown, the current
            // thread owns the mutexes, and must release them.
            //
            _orphan4.ReleaseMutex();
            _orphan5.ReleaseMutex();
        }
    }

    [MTAThread]
    public static void AbandonMutex()
    {
        _orphan1.WaitOne();
        _orphan2.WaitOne();
        _orphan3.WaitOne();
        _orphan4.WaitOne();
        _orphan5.WaitOne();
        // Abandon the mutexes by exiting without releasing them.
        Console.WriteLine("Thread exits without releasing the mutexes.");
    }
}

/* This code example produces the following output:

Thread exits without releasing the mutexes.
Exception on return from WaitOne.
        Message: The wait completed due to an abandoned mutex.
Exception on return from WaitAny at index 1.
        Message: The wait completed due to an abandoned mutex.
Exception on return from WaitAll. MutexIndex = -1.
        Message: The wait completed due to an abandoned mutex.
 */
Option Explicit
Imports System.Threading

Public Class Example
    Private Shared _dummy As New ManualResetEvent(False)

    Private Shared _orphan1 As New Mutex()
    Private Shared _orphan2 As New Mutex()
    Private Shared _orphan3 As New Mutex()
    Private Shared _orphan4 As New Mutex()
    Private Shared _orphan5 As New Mutex()

    <MTAThread> _
    Public Shared Sub Main()
        ' Start a thread that takes all five mutexes, and then
        ' ends without releasing them.
        '
        Dim t As New Thread(AddressOf AbandonMutex)
        t.Start()
        ' Make sure the thread is finished.
        t.Join()

        ' Wait on one of the abandoned mutexes. The WaitOne returns
        ' immediately, because its wait condition is satisfied by
        ' the abandoned mutex, but on return it throws
        ' AbandonedMutexException.
        Try
            _orphan1.WaitOne()
            Console.WriteLine("WaitOne succeeded.")
        Catch ex As AbandonedMutexException
            Console.WriteLine("Exception on return from WaitOne." _
                & vbCrLf & vbTab & "Message: " _
                & ex.Message) 
        Finally
            ' Whether or not the exception was thrown, the current
            ' thread owns the mutex, and must release it.
            '
            _orphan1.ReleaseMutex()
        End Try

        ' Create an array of wait handles, consisting of one
        ' ManualResetEvent and two mutexes, using two more of the
        ' abandoned mutexes.
        Dim waitFor(2) As WaitHandle
        waitFor(0) = _dummy
        waitFor(1) = _orphan2
        waitFor(2) = _orphan3

        ' WaitAny returns when any of the wait handles in the 
        ' array is signaled, so either of the two abandoned mutexes
        ' satisfy its wait condition. On returning from the wait,
        ' WaitAny throws AbandonedMutexException. The MutexIndex
        ' property returns the lower of the two index values for 
        ' the abandoned mutexes. Note that the Try block and the
        ' Catch block obtain the index in different ways.
        '  
        Try
            Dim index As Integer = WaitHandle.WaitAny(waitFor)
            Console.WriteLine("WaitAny succeeded.")

            Dim m As Mutex = TryCast(waitFor(index), Mutex)

            ' The current thread owns the mutex, and must release
            ' it.
            If m IsNot Nothing Then m.ReleaseMutex()
        Catch ex As AbandonedMutexException
            Console.WriteLine("Exception on return from WaitAny at index " _
                & ex.MutexIndex & "." _
                & vbCrLf & vbTab & "Message: " _
                & ex.Message) 

            ' Whether or not the exception was thrown, the current
            ' thread owns the mutex, and must release it.
            '
            If ex.Mutex IsNot Nothing Then ex.Mutex.ReleaseMutex()            
        End Try

        ' Use two more of the abandoned mutexes for the WaitAll call.
        ' WaitAll doesn't return until all wait handles are signaled,
        ' so the ManualResetEvent must be signaled by calling Set(). 
        _dummy.Set()
        waitFor(1) = _orphan4
        waitFor(2) = _orphan5

        ' The signaled event and the two abandoned mutexes satisfy
        ' the wait condition for WaitAll, but on return it throws
        ' AbandonedMutexException. For WaitAll, the MutexIndex
        ' property is always -1 and the Mutex property is always
        ' Nothing.
        '  
        Try
            WaitHandle.WaitAll(waitFor)
            Console.WriteLine("WaitAll succeeded.")
        Catch ex As AbandonedMutexException
            Console.WriteLine("Exception on return from WaitAll. MutexIndex = " _
                & ex.MutexIndex & "." _
                & vbCrLf & vbTab & "Message: " _
                & ex.Message) 
        Finally
            ' Whether or not the exception was thrown, the current
            ' thread owns the mutexes, and must release them.
            '
            CType(waitFor(1), Mutex).ReleaseMutex()
            CType(waitFor(2), Mutex).ReleaseMutex()
        End Try
    End Sub

    <MTAThread> _
    Public Shared Sub AbandonMutex()
        _orphan1.WaitOne()
        _orphan2.WaitOne()
        _orphan3.WaitOne()
        _orphan4.WaitOne()
        _orphan5.WaitOne()
        ' Abandon the mutexes by exiting without releasing them.
        Console.WriteLine("Thread exits without releasing the mutexes.")
    End Sub
End Class

' This code example produces the following output:
'
'Thread exits without releasing the mutexes.
'Exception on return from WaitOne.
'        Message: The wait completed due to an abandoned mutex.
'Exception on return from WaitAny at index 1.
'        Message: The wait completed due to an abandoned mutex.
'Exception on return from WaitAll. MutexIndex = -1.
'        Message: The wait completed due to an abandoned mutex.

Comentarios

Cuando un subproceso abandona una exclusión mutua, la excepción se produce en el subproceso siguiente que adquiere la exclusión mutua.When a thread abandons a mutex, the exception is thrown in the next thread that acquires the mutex. El subproceso podría adquirir la exclusión mutua porque ya estaba esperando en la exclusión mutua o porque entra en la exclusión mutua en otro momento.The thread might acquire the mutex because it was already waiting on the mutex or because it enters the mutex at a later time.

Una exclusión mutua abandonada indica un error de programación grave.An abandoned mutex indicates a serious programming error. Cuando un subproceso sale sin liberar la exclusión mutua, puede que las estructuras de datos protegidas por la exclusión mutua no estén en un estado coherente.When a thread exits without releasing the mutex, the data structures protected by the mutex might not be in a consistent state. Antes de la versión 2,0 del .NET Framework, estos problemas eran difíciles de detectar porque no se produjo ninguna excepción si una espera se completa como resultado de una exclusión mutua abandonada.Prior to version 2.0 of the .NET Framework, such problems were hard to discover because no exception was thrown if a wait completed as the result of an abandoned mutex. Para obtener más información, vea la clase Mutex.For more information, see the Mutex class.

El siguiente subproceso para solicitar la propiedad de la exclusión mutua puede controlar esta excepción y continuar, siempre que se pueda comprobar la integridad de las estructuras de datos.The next thread to request ownership of the mutex can handle this exception and proceed, provided that the integrity of the data structures can be verified.

Constructores

AbandonedMutexException()

Inicializa una nueva instancia de la clase AbandonedMutexException con valores predeterminados.Initializes a new instance of the AbandonedMutexException class with default values.

AbandonedMutexException(Int32, WaitHandle)

Inicializa una nueva instancia de la clase AbandonedMutexException con un índice especificado para la exclusión mutua abandonada, si es aplicable, y un objeto Mutex que representa la exclusión mutua.Initializes a new instance of the AbandonedMutexException class with a specified index for the abandoned mutex, if applicable, and a Mutex object that represents the mutex.

AbandonedMutexException(SerializationInfo, StreamingContext)

Inicializa una nueva instancia de la clase AbandonedMutexException con datos serializados.Initializes a new instance of the AbandonedMutexException class with serialized data.

AbandonedMutexException(String)

Inicializa una nueva instancia de la clase AbandonedMutexException con el mensaje de error especificado.Initializes a new instance of the AbandonedMutexException class with a specified error message.

AbandonedMutexException(String, Exception)

Inicializa una nueva instancia de la clase AbandonedMutexException con un mensaje de error y una excepción interna especificados.Initializes a new instance of the AbandonedMutexException class with a specified error message and inner exception.

AbandonedMutexException(String, Exception, Int32, WaitHandle)

Inicializa una nueva instancia de la clase AbandonedMutexException con un mensaje de error especificado, la excepción interna, el índice para la exclusión mutua abandonada, si es aplicable, y un objeto Mutex que representa la exclusión mutua.Initializes a new instance of the AbandonedMutexException class with a specified error message, the inner exception, the index for the abandoned mutex, if applicable, and a Mutex object that represents the mutex.

AbandonedMutexException(String, Int32, WaitHandle)

Inicializa una nueva instancia de la clase AbandonedMutexException con un mensaje de error especificado, el índice de la exclusión mutua abandonada, si es aplicable, y la exclusión mutua abandonada.Initializes a new instance of the AbandonedMutexException class with a specified error message, the index of the abandoned mutex, if applicable, and the abandoned mutex.

Propiedades

Data

Obtiene una colección de pares clave/valor que proporciona información definida por el usuario adicional sobre la excepción.Gets a collection of key/value pairs that provide additional user-defined information about the exception.

(Heredado de Exception)
HelpLink

Obtiene o establece un vínculo al archivo de ayuda asociado a esta excepción.Gets or sets a link to the help file associated with this exception.

(Heredado de Exception)
HResult

Obtiene o establece HRESULT, un valor numérico codificado que se asigna a una excepción específica.Gets or sets HRESULT, a coded numerical value that is assigned to a specific exception.

(Heredado de Exception)
InnerException

Obtiene la instancia Exception que produjo la excepción actual.Gets the Exception instance that caused the current exception.

(Heredado de Exception)
Message

Obtiene un mensaje que describe la excepción actual.Gets a message that describes the current exception.

(Heredado de Exception)
Mutex

Obtiene la exclusión mutua abandonada que produjo la excepción, si se conoce.Gets the abandoned mutex that caused the exception, if known.

MutexIndex

Obtiene el índice de la exclusión mutua abandonada que produjo la excepción, si se conoce.Gets the index of the abandoned mutex that caused the exception, if known.

Source

Devuelve o establece el nombre de la aplicación o del objeto que generó el error.Gets or sets the name of the application or the object that causes the error.

(Heredado de Exception)
StackTrace

Obtiene una representación de cadena de los marcos inmediatos en la pila de llamadas.Gets a string representation of the immediate frames on the call stack.

(Heredado de Exception)
TargetSite

Obtiene el método que produjo la excepción actual.Gets the method that throws the current exception.

(Heredado de Exception)

Métodos

Equals(Object)

Determina si el objeto especificado es igual que el objeto actual.Determines whether the specified object is equal to the current object.

(Heredado de Object)
GetBaseException()

Cuando se invalida en una clase derivada, devuelve la clase Exception que representa la causa principal de una o más excepciones posteriores.When overridden in a derived class, returns the Exception that is the root cause of one or more subsequent exceptions.

(Heredado de Exception)
GetHashCode()

Sirve como función hash predeterminada.Serves as the default hash function.

(Heredado de Object)
GetObjectData(SerializationInfo, StreamingContext)

Cuando se invalida en una clase derivada, establece SerializationInfo con información sobre la excepción.When overridden in a derived class, sets the SerializationInfo with information about the exception.

(Heredado de Exception)
GetType()

Obtiene el tipo de tiempo de ejecución de la instancia actual.Gets the runtime type of the current instance.

(Heredado de Exception)
MemberwiseClone()

Crea una copia superficial del Object actual.Creates a shallow copy of the current Object.

(Heredado de Object)
ToString()

Crea y devuelve una representación de cadena de la excepción actual.Creates and returns a string representation of the current exception.

(Heredado de Exception)

Eventos

SerializeObjectState

Ocurre cuando una excepción se serializa para crear un objeto de estado de excepción que contenga datos serializados sobre la excepción.Occurs when an exception is serialized to create an exception state object that contains serialized data about the exception.

(Heredado de Exception)

Se aplica a

Consulte también