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MutexRights Enumeration

Note: This enumeration is new in the .NET Framework version 2.0.

Specifies the access control rights that can be applied to named system mutex objects.

This enumeration has a FlagsAttribute attribute that allows a bitwise combination of its member values.

Namespace: System.Security.AccessControl
Assembly: mscorlib (in mscorlib.dll)

[FlagsAttribute] 
public enum MutexRights
/** @attribute FlagsAttribute() */ 
public enum MutexRights
FlagsAttribute 
public enum MutexRights

 Member nameDescription
ChangePermissionsThe right to change the security and audit rules associated with a named mutex. 
DeleteThe right to delete a named mutex. 
FullControlThe right to exert full control over a named mutex, and to modify its access rules and audit rules. 
ModifyThe right to release a named mutex. 
ReadPermissionsThe right to open and copy the access rules and audit rules for a named mutex. 
SynchronizeThe right to wait on a named mutex. 
TakeOwnershipThe right to change the owner of a named mutex. 

Use the MutexRights enumeration to specify access control rights when you create MutexSecurity objects. To apply access rights to a named system mutex, use MutexSecurity objects with the Mutex constructor and the Mutex.SetAccessControl method.

The following code example demonstrates the use of MutexRights values when creating and using MutexAccessRule objects. The example creates an MutexSecurity object, adds rules that allow and deny various rights for the current user, and displays the resulting pair of rules. The example then allows new rights for the current user and displays the result, showing that the new rights are merged with the existing AccessControlType.Allow rule.

NoteNote

This example does not attach the security object to a Mutex object; see MutexSecurity, Mutex.GetAccessControl method, and Mutex.SetAccessControl.

using System;
using System.Threading;
using System.Security.AccessControl;
using System.Security.Principal;

public class Example
{
    public static void Main()
    {
        // Create a string representing the current user.
        string user = Environment.UserDomainName + "\\" + 
            Environment.UserName;

        // Create a security object that grants no access.
        MutexSecurity mSec = new MutexSecurity();

        // Add a rule that grants the current user the 
        // right to enter or release the mutex.
        MutexAccessRule rule = new MutexAccessRule(user, 
            MutexRights.Synchronize | MutexRights.Modify, 
            AccessControlType.Allow);
        mSec.AddAccessRule(rule);

        // Add a rule that denies the current user the 
        // right to change permissions on the mutex.
        rule = new MutexAccessRule(user, 
            MutexRights.ChangePermissions, 
            AccessControlType.Deny);
        mSec.AddAccessRule(rule);

        // Display the rules in the security object.
        ShowSecurity(mSec);

        // Add a rule that allows the current user the 
        // right to read permissions on the mutex. This rule
        // is merged with the existing Allow rule.
        rule = new MutexAccessRule(user, 
            MutexRights.ReadPermissions, 
            AccessControlType.Allow);
        mSec.AddAccessRule(rule);

        ShowSecurity(mSec);
    }

    private static void ShowSecurity(MutexSecurity security)
    {
        Console.WriteLine("\r\nCurrent access rules:\r\n");

        foreach(MutexAccessRule ar in 
            security.GetAccessRules(true, true, typeof(NTAccount)))
        {
            Console.WriteLine("        User: {0}", ar.IdentityReference);
            Console.WriteLine("        Type: {0}", ar.AccessControlType);
            Console.WriteLine("      Rights: {0}", ar.MutexRights);
            Console.WriteLine();
        }
    }
}

/*This code example produces output similar to following:

Current access rules:

        User: TestDomain\TestUser
        Type: Deny
      Rights: ChangePermissions

        User: TestDomain\TestUser
        Type: Allow
      Rights: Modify, Synchronize


Current access rules:

        User: TestDomain\TestUser
        Type: Deny
      Rights: ChangePermissions

        User: TestDomain\TestUser
        Type: Allow
      Rights: Modify, ReadPermissions, Synchronize
 */

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

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0

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