Was this page helpful?
Your feedback about this content is important. Let us know what you think.
Additional feedback?
1500 characters remaining
Mutex Constructor
Collapse the table of content
Expand the table of content

Mutex Constructor

Initializes a new instance of the Mutex class with a Boolean value that indicates whether the calling thread should have initial ownership of the mutex, and a string that is the name of the mutex.

Namespace:  System.Threading
Assembly:  mscorlib.Extensions (in mscorlib.Extensions.dll)

public Mutex(
	bool initiallyOwned,
	string name


Type: System.Boolean
true to give the calling thread initial ownership of the named system mutex if the named system mutex is created as a result of this call; otherwise, false.
Type: System.String
The name of the Mutex. If the value is null, the Mutex is unnamed.


The named mutex exists and has access control security, but the user does not have MutexRights.FullControl.


The named mutex cannot be created, perhaps because a wait handle of a different type has the same name.


name is longer than 260 characters.

If name is not null and initiallyOwned is true, the calling thread owns the mutex only if the named system mutex was created as a result of this call. Since there is no mechanism for determining whether the named system mutex was created, it is better to specify false for initiallyOwned when calling this constructor. This constructor initializes a Mutex object that represents a named system mutex. You can create multiple Mutex objects that represent the same named system mutex.

Because they are system-wide, named mutexes can be used to coordinate resource use across process boundaries.

Version Notes

Silverlight for Windows Phone Silverlight for Windows Phone

 In Silverlight for Windows Phone, private object namespaces are not supported. In the .NET Framework, object namespaces are supported and because of this the backslash (\) is considered a delimiter and is not supported in the name parameter. In Silverlight for Windows Phone you can use a backslash (\) in the name parameter.

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

Community Additions

© 2015 Microsoft