.NET Mutext.ReleaseMutex and Mutex.Close

ReleaseMutex is used to allow another thread to obtain the mutex. It should only be called if you have acquired the mutex (called WaitOne and acquired it or acquired through the constructor). Important Note ReleaseMutex will throw an exception if you have not acquired the mutex.

Close is used to clean up the resources that have been allocated by declaring the mutex object, whether you ever blocked on it or not, if you have acquired the mutex it will release it (equivalent to calling ReleaseMutex. If you plan to lock on the mutex for the whole application (i.e. using this to ensure a single instance of your app), then I would wrap it in a using statement like the example in Joseph Albahari's threading guide (a must read).


Comments

  1. Toby

    • 2017/10/16

    Close is used to clean up the resources that have been allocated by declaring the mutex object, whether you ever blocked on it or not, if you have acquired the 

  2. Marlon

    • 2017/2/23

    I took your advice and changed Mutex.ReleaseMutex() to Mutex.Close() in my solution to the collision between VB's Application Framework and the ClickOnce API. – InteXX Mar 24 '14 at 9:05

  3. Taylor

    • 2017/3/10

    docs.microsoft.com › Docs › .NET › .NET API browser › System.Threading

  4. Beckett

    • 2021/2/3

    I've got a quick question about Mutex. Let's take the following situation. ----- Program Instance 1: Starts & Runs, creating the Mutex. Program Instance 2: Starts, checks

  5. Jones

    • 2019/9/16

    Because each calling thread is blocked until it acquires ownership of the mutex, it must call the ReleaseMutex method to release ownership of the mutex. C# Copy.

  6. Lyle

    • 2019/3/12

    (1) Start the mutex creator program, and display the "Will stop using mutex when closed" message. (2) Start the mutex user program, and display the "Click ok to start waiting for mutex" message, and click OK on that message. (3) Click the message box "OK" in the mutex creator program. (4) Close the mutex creator program.

  7. Leone

    • 2018/7/30

    WaitOne method to lock and ReleaseMutex to unlock. Closing or disposing a Mutex automatically releases it. Just as with the lock statement, 

  8. Graham

    • 2015/4/2

    In C#, it's as simple as: Instantiating a new static Mutex object that's accessible from each thread. Wrapping whatever code you want to be executed in the critical section with that object's WaitOne() and ReleaseMutex() methods in each thread; With a Mutex class, you call the WaitHandle.WaitOne method to lock and ReleaseMutex to unlock. Closing or disposing a Mutex automatically releases it.

  9. Thiago

    • 2016/4/15

    NET framework class Mutex is actually a wrapper class for the same Win32 kernel Monitor and you need to explicitly close the mutex when it is released.

  10. Ameer

    • 2019/12/6

    The Mutex class provides the WaitOne() method which we need to call to lock the resource and similarly it provides ReleaseMutex() which is used to unlock the resource. Note that a Mutex can only be released from the same thread which obtained it. Example: The following example shows the use of the C# Mutex class. The code is self-explained.

  11. Giordano

    • 2015/10/7

    Net is represented by the Mutex class. Take a short detour if (firstInstance) { mutex.ReleaseMutex(); } mutex.Close(); mutex = null; }

  12. Gunner

    • 2019/9/2

    To own a mutex object, a thread uses WaitOne() method whereas ReleaseMutex() method is being used to release the mutex object.

  13. Mack

    • 2018/12/13

    Mutex.Close extracted from open source projects. WriteLine("CloseMutex release mutex."); Thread. NET 4.0 var value = Registry.

  14. Mac

    • 2017/10/8

    NET Applications Using Component-Oriented Programming Juval Lowy. public Mutex(bool Only the current owner of the mutex can call ReleaseMutex( ).

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