Mutex.cs :  » 2.6.4-mono-.net-core » System.Threading » System » Threading » C# / CSharp Open Source

//
// System.Threading.Mutex.cs
//
// Author:
//   Dick Porter (dick@ximian.com)
//   Veronica De Santis (veron78@interfree.it)
//
// (C) Ximian, Inc.  http://www.ximian.com
// Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System.Runtime.CompilerServices;
using System.Security.Permissions;

using System.Runtime.ConstrainedExecution;
using System.IO;
using System.Runtime.InteropServices;
#if !NET_2_1
using System.Security.AccessControl;
#endif

namespace System.Threading{
  [ComVisible (true)]
  public sealed class Mutex : WaitHandle 
  {
    [MethodImplAttribute(MethodImplOptions.InternalCall)]
    private static extern IntPtr  CreateMutex_internal(
                                             bool initiallyOwned,
                                             string name,
               out bool created);

    [MethodImplAttribute(MethodImplOptions.InternalCall)]
    private static extern bool ReleaseMutex_internal(IntPtr handle);

#if !NET_2_1
    [MethodImplAttribute (MethodImplOptions.InternalCall)]
    private static extern IntPtr OpenMutex_internal (string name, MutexRights rights, out MonoIOError error);
    
    private Mutex (IntPtr handle)
    {
      Handle = handle;
    }
#endif
    
    [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.MayFail)]
    public Mutex() {
      bool created;
      
      Handle=CreateMutex_internal(false, null, out created);
    }
    
    [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.MayFail)]
    public Mutex(bool initiallyOwned) {
      bool created;
      
      Handle=CreateMutex_internal(initiallyOwned, null,
                out created);
    }

    [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.MayFail)]
    [SecurityPermission (SecurityAction.LinkDemand, UnmanagedCode = true)]
    public Mutex (bool initiallyOwned, string name)
    {
      bool created;
      Handle = CreateMutex_internal (initiallyOwned, name, out created);
    }

    [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.MayFail)]
    [SecurityPermission (SecurityAction.LinkDemand, UnmanagedCode = true)]
    public Mutex (bool initiallyOwned, string name, out bool createdNew)
    {
      Handle = CreateMutex_internal (initiallyOwned, name, out createdNew);
    }

#if !NET_2_1
    [MonoTODO ("Implement MutexSecurity")]
    [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.MayFail)]
    public Mutex (bool initiallyOwned, string name, out bool createdNew, MutexSecurity mutexSecurity)
    {
      Handle = CreateMutex_internal (initiallyOwned, name, out createdNew);
    }

    public MutexSecurity GetAccessControl ()
    {
      throw new NotImplementedException ();
    }

    public static Mutex OpenExisting (string name)
    {
      return(OpenExisting (name, MutexRights.Synchronize |
               MutexRights.Modify));
    }
    
    public static Mutex OpenExisting (string name,
              MutexRights rights)
    {
      if (name == null) {
        throw new ArgumentNullException ("name");
      }
      if ((name.Length == 0) ||
          (name.Length > 260)) {
        throw new ArgumentException ("name", Locale.GetText ("Invalid length [1-260]."));
      }
      
      MonoIOError error;
      IntPtr handle = OpenMutex_internal (name, rights,
                  out error);
      if (handle == (IntPtr)null) {
        if (error == MonoIOError.ERROR_FILE_NOT_FOUND) {
          throw new WaitHandleCannotBeOpenedException (Locale.GetText ("Named Mutex handle does not exist: ") + name);
        } else if (error == MonoIOError.ERROR_ACCESS_DENIED) {
          throw new UnauthorizedAccessException ();
        } else {
          throw new IOException (Locale.GetText ("Win32 IO error: ") +  error.ToString ());
        }
      }
      
      return(new Mutex (handle));
    }
#endif

    [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.MayFail)]
    public void ReleaseMutex() {
      bool success = ReleaseMutex_internal(Handle);
      if (!success) {
        throw new ApplicationException ("Mutex is not owned");
      }
    }

#if !NET_2_1
    public void SetAccessControl (MutexSecurity mutexSecurity)
    {
      throw new NotImplementedException ();
    }
#endif
  }
}