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	"title": "Mutexes - .NET",
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	"authors": "",
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	"plain_text": "Mutexes - .NET\r\nBy BillWagner\r\nArchived: 2026-04-05 23:11:32 UTC\r\nYou can use a Mutex object to provide exclusive access to a resource. The Mutex class uses more system\r\nresources than the Monitor class, but it can be marshalled across application domain boundaries, it can be used\r\nwith multiple waits, and it can be used to synchronize threads in different processes. For a comparison of managed\r\nsynchronization mechanisms, see Overview of Synchronization Primitives.\r\nFor code examples, see the reference documentation for the Mutex constructors.\r\nA thread calls the WaitOne method of a mutex to request ownership. The call blocks until the mutex is available,\r\nor until the optional timeout interval elapses. The state of a mutex is signaled if no thread owns it.\r\nA thread releases a mutex by calling its ReleaseMutex method. Mutexes have thread affinity; that is, the mutex\r\ncan be released only by the thread that owns it. If a thread releases a mutex it does not own, an\r\nApplicationException is thrown in the thread.\r\nBecause the Mutex class derives from WaitHandle, you can also call the static WaitAll or WaitAny methods of\r\nWaitHandle to request ownership of a Mutex in combination with other wait handles.\r\nIf a thread owns a Mutex, that thread can specify the same Mutex in repeated wait-request calls without blocking\r\nits execution; however, it must release the Mutex as many times to release ownership.\r\nIf a thread terminates without releasing a Mutex, the mutex is said to be abandoned. This often indicates a serious\r\nprogramming error because the resource the mutex is protecting might be left in an inconsistent state. An\r\nAbandonedMutexException is thrown in the next thread that acquires the mutex.\r\nIn the case of a system-wide mutex, an abandoned mutex might indicate that an application has been terminated\r\nabruptly (for example, by using Windows Task Manager).\r\nMutexes are of two types: local mutexes and named system mutexes. If you create a Mutex object using a\r\nconstructor that accepts a name, it is associated with an operating-system object of that name. Named system\r\nmutexes are visible throughout the operating system and can be used to synchronize the activities of processes.\r\nYou can create multiple Mutex objects that represent the same named system mutex, and you can use the\r\nOpenExisting method to open an existing named system mutex.\r\nA local mutex exists only within your process. It can be used by any thread in your process that has a reference to\r\nthe local Mutex object. Each Mutex object is a separate local mutex.\r\n.NET Framework provides the ability to query and set Windows access control security for named system objects.\r\nProtecting system mutexes from the moment of creation is recommended because system objects are global and\r\ntherefore can be locked by code other than your own.\r\nhttps://learn.microsoft.com/en-us/dotnet/standard/threading/mutexes\r\nPage 1 of 2\n\nFor information on access control security for mutexes, see the MutexSecurity and MutexAccessRule classes, the\r\nMutexRights enumeration, the GetAccessControl, SetAccessControl, and OpenExisting methods of the Mutex\r\nclass, and the Mutex(Boolean, String, Boolean, MutexSecurity) constructor.\r\nNote\r\nAccess control security for system mutexes is only available with .NET Framework, it's not available with .NET\r\nCore or .NET 5+.\r\nSystem.Threading.Mutex\r\nMutex\r\nSystem.Security.AccessControl.MutexSecurity\r\nSystem.Security.AccessControl.MutexAccessRule\r\nSystem.Threading.Monitor\r\nThreading objects and features\r\nThreads and threading\r\nThreading\r\nSource: https://learn.microsoft.com/en-us/dotnet/standard/threading/mutexes\r\nhttps://learn.microsoft.com/en-us/dotnet/standard/threading/mutexes\r\nPage 2 of 2",
	"extraction_quality": 1,
	"language": "EN",
	"sources": [
		"MITRE"
	],
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	"references": [
		"https://learn.microsoft.com/en-us/dotnet/standard/threading/mutexes"
	],
	"report_names": [
		"mutexes"
	],
	"threat_actors": [],
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