{"id":94885,"date":"2023-08-26T07:30:46","date_gmt":"2023-08-26T05:30:46","guid":{"rendered":"https:\/\/code-maze.com\/?p=94885"},"modified":"2023-08-26T08:11:04","modified_gmt":"2023-08-26T06:11:04","slug":"csharp-how-to-use-mutex-class","status":"publish","type":"post","link":"https:\/\/code-maze.com\/csharp-how-to-use-mutex-class\/","title":{"rendered":"How to Use Mutex in C#"},"content":{"rendered":"<p>In this article, we are going to learn how to use the Mutex class in C#.<\/p>\n<p>Multithreading can significantly boost an application&#8217;s performance, but it also brings challenges related to synchronizing and coordinating tasks across different threads (and even processes). With C#, we have a variety of tools at our disposal to overcome these challenges and build a resilient, performant application that makes full use of the available computing resources. One such tool is the Mutex class.<\/p>\n<div style=\"padding: 20px; border-left: 5px #dc2323 solid; display: block; margin-bottom: 20px; box-shadow: 1px 1px 5px 0px lightgrey;\">To download the source code for this article, you can visit our <a href=\"https:\/\/github.com\/CodeMazeBlog\/CodeMazeGuides\/tree\/main\/csharp-advanced-topics\/MutexClassInCSharp\" target=\"_blank\" rel=\"nofollow noopener\">GitHub repository<\/a>.<\/div>\n<p>Let&#8217;s start.<\/p>\n<h2><a id=\"what-are-synchronization-primitives\"><\/a>What Are Synchronization Primitives?<\/h2>\n<p style=\"direction: ltr;\">In many cases, <strong>trying to access a resource simultaneously from multiple threads will cause corruption<\/strong>. For example, we can only write to a file from one place at a time\u2014otherwise, the operations will mangle the data up and the file will get corrupt! Synchronization primitives are tools we have at our disposal to safely access these types of resources from a multi-threaded environment. They do this by making sure we <strong>don&#8217;t make more simultaneous requests to a resource than is acceptable<\/strong>.<\/p>\n<h2><a id=\"overview-of-mutexes-in-csharp\"><\/a>Overview of a Mutex in C#<\/h2>\n<p>A Mutex is one of the synchronization primitives that the operating system provides which we can use in C#. Simply put, a <code>Mutex<\/code> restricts access to a resource so that <strong>only one thread can access it at a time<\/strong>.<\/p>\n<p>It does this through the concept of ownership: <b>threads must only access the resource protected by the <code>Mutex<\/code> if they own the <code>Mutex<\/code><\/b>. Any thread may attempt to acquire ownership of the <code>Mutex<\/code> upon which one of these outcomes may happen:<\/p>\n<ul>\n<li style=\"direction: ltr;\">If the <code>Mutex<\/code> is free, the requesting thread will successfully acquire its ownership<\/li>\n<li>If another thread currently owns the <code>Mutex<\/code>, the requesting thread will be blocked until the currently owning thread releases it<\/li>\n<li>If the thread that currently owns the <code>Mutex<\/code> (or last owned it) exits without releasing it, an <code>AbandonedMutexException<\/code> exception will be thrown.<\/li>\n<\/ul>\n<p>This means that\u00a0<strong>it is not possible for more than one thread to own the <code>Mutex<\/code> at once<\/strong>.<\/p>\n<h2><a id=\"basic-usage-of-mutexes-in-csharp\"><\/a>Basic Usage of a Mutex in C#<\/h2>\n<p>Let&#8217;s create a <code>Mutex<\/code> using its constructor:<\/p>\n<p><code class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\">var mutex = new Mutex();<\/code><\/p>\n<p>Doing this, we&#8217;ll get a <code>Mutex<\/code> that&#8217;s local and that no thread initially owns. If we instead want the current thread to own the <code>Mutex<\/code>, we can specify the first parameter, <code>initiallyOwned<\/code> as <code>true<\/code>. We&#8217;ll soon learn what we mean by a local <code>Mutex<\/code> and also create a <code>Mutex<\/code> that isn&#8217;t local.<\/p>\n<p>We should have a reference to the <code>Mutex<\/code> object from each thread we might need to access a protected resource in. Once that need arises, from that same thread we want to access the resource, we&#8217;ll invoke its <code>WaitOne<\/code> method:<\/p>\n<p><code class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\">mutex.WaitOne();<\/code><\/p>\n<p>This method will only return once we&#8217;ve acquired ownership of the <code>Mutex<\/code>. After this point, <strong>we can safely access the protected resource<\/strong> without the risk of a race condition.<\/p>\n<p>Once we&#8217;re done with the resource, <strong>we must take care to release the <code>Mutex<\/code><\/strong> so that other threads can acquire it:<\/p>\n<p><code class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\">mutex.ReleaseMutex();<\/code><\/p>\n<p>If our thread terminates without releasing the <code>Mutex<\/code>, it will be put in an <strong>abandoned state<\/strong>. The next thread that acquires the <code>Mutex<\/code> will encounter an <code>AbandonedMutexException<\/code> exception on the <code>WaitOne<\/code> method. It&#8217;s good practice to handle this exception when waiting on a <code>Mutex<\/code>.<\/p>\n<h2><a id=\"named-system-mutexes\"><\/a>Named System Mutexes in C#<\/h2>\n<p>Local <code>Mutex<\/code> objects are sufficient for coordinating access to a protected resource in a single process. However, if we have <strong>multiple processes that need to access a single resource<\/strong>, we need a <code>Mutex<\/code> that can span all those processes. We call this type of <code>Mutex<\/code> a <strong>named system <code>Mutex<\/code><\/strong>\u2014it has a name associated with it and any process on the system can access the same <code>Mutex<\/code> with its name.<\/p>\n<p>To create a named system <code>Mutex<\/code>, we provide the <code>name<\/code> parameter to the constructor (this is the second parameter):<\/p>\n<p><code class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">var mutex = new Mutex(initiallyOwned: false, \"MyMutex\");<\/code><\/p>\n<p>All <code>Mutex<\/code> objects on the system with this name refer to the same underlying <code>Mutex<\/code> in the operating system. The rules we discussed still apply: only one thread can own this <code>Mutex<\/code> at a time (<strong>even across different <code>Mutex<\/code> instances<\/strong> as long as they all have the same name).<\/p>\n<p>We can prefix <code>Mutex<\/code> names with either <code>Global\\<\/code> or <code>Local\\<\/code>. The exact behavior of these prefixes varies by platform, but <code>Mutex<\/code> instances with the former prefix are generally visible throughout the entire system; those prefixed with the latter may be more isolated.<\/p>\n<p>On certain platforms which isolate processes well, we may have to prefix all <code>Mutex<\/code> names with <code>Global\\<\/code> to get the behavior we expect.<\/p>\n<h2><a id=\"example-mutex-use-case-file-io\"><\/a>Example Mutex Use-Case: File IO<\/h2>\n<p>Let&#8217;s start with a very simple method that writes some data to a file:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\">public static void WriteNumbers(string fileName)\r\n{\r\n    for (int number = 1; number &lt;= 50; number++)\r\n    {\r\n        File.AppendAllText(fileName, $\"{number} \");\r\n        Thread.Sleep(100);\r\n    }\r\n}\r\n<\/pre>\n<p>It appends all integers from 1 to 50 to the file\u00a0each time we execute it.<\/p>\n<p>However, we haven&#8217;t implemented any synchronization between threads or processes yet. If we execute this code multiple times simultaneously, we will see multiple different number streams interweaved into the file.<\/p>\n<p>Let&#8217;s fix this:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-highlight=\"3,5,13\">public static void WriteNumbers(string fileName)\r\n{\r\n    using var mutex = new Mutex(initiallyOwned: false, \"Global\\\\numbers_output\");\r\n\r\n    mutex.WaitOne();\r\n\r\n    for (var number = 1; number &lt;= 50; number++)\r\n    {\r\n        File.AppendAllText(fileName, $\"{number} \");\r\n        Thread.Sleep(100);\r\n    }\r\n\r\n    mutex.ReleaseMutex();\r\n}<\/pre>\n<p>We create a named system <code>Mutex<\/code> to synchronize access to the file. We then acquire ownership of the <code>Mutex<\/code> before beginning to write the numbers. Finally, after writing to the file, we release the <code>Mutex<\/code>.<\/p>\n<p>Now, even if we run this code multiple times simultaneously, we won&#8217;t get any interweaving between the different number streams. That&#8217;s because we&#8217;re only writing to the file while we have ownership of the <code>Mutex<\/code>, and that can only be the case with one thread at a time.<\/p>\n<h2>Error Handling in Mutex-Protected Code<\/h2>\n<p>In our code, we haven&#8217;t implemented any error handling. The <code>ReleaseMutex<\/code> method will never be called if we encounter an exception in our loop. The next thread to acquire this <code>Mutex<\/code> will face an <code>AbandonedMutexException<\/code> exception.<\/p>\n<p>Another scenario we haven&#8217;t considered is if the <code>Mutex<\/code> is in an abandoned state when we try to acquire it.<\/p>\n<p>Let&#8217;s solve that:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-highlight=\"5-6,8-12,14-15,21-25\">public static void WriteNumbers(string fileName)\r\n{\r\n    using var mutex = new Mutex(initiallyOwned: false, \"Global\\\\numbers_output\");\r\n\r\n    try\r\n    {\r\n        mutex.WaitOne();\r\n    }\r\n    catch (AbandonedMutexException)\r\n    {\r\n        File.WriteAllText(fileName, string.Empty);\r\n    }\r\n\r\n    try\r\n    {\r\n        for (var number = 1; number &lt;= 50; number++)\r\n        {\r\n            File.AppendAllText(fileName, $\"{number} \");\r\n            Thread.Sleep(100);\r\n        }\r\n    }\r\n    finally\r\n    {\r\n        mutex.ReleaseMutex();\r\n    }\r\n}<\/pre>\n<p>Now, if the last owner of the <code>Mutex<\/code> abandoned it, we assume that the file is corrupt and clear its contents. We&#8217;ll then proceed with writing the numbers as usual.<\/p>\n<p>We also guarantee that we call the <code>ReleaseMutex<\/code> method if the loop throws an exception.<\/p>\n<h2><a id=\"conclusion\"><\/a>Conclusion<\/h2>\n<p>With the <code>Mutex<\/code> class in C#, we can easily overcome a lot of the different challenges we face when trying to access a shared resource from a multi-threaded environment. We can offload the heavy lifting to the operating system and rely on its guarantees to write safe, performant code that makes the maximum use of all the resources it has available.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this article, we are going to learn how to use the Mutex class in C#. Multithreading can significantly boost an application&#8217;s performance, but it also brings challenges related to synchronizing and coordinating tasks across different threads (and even processes). With C#, we have a variety of tools at our disposal to overcome these challenges [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":62189,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[12],"tags":[1811,1483,1926,1927],"class_list":["post-94885","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-csharp","tag-c","tag-multi-threading","tag-mutex","tag-synchronization","et-has-post-format-content","et_post_format-et-post-format-standard"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to Use Mutex in C# - Code Maze<\/title>\n<meta name=\"description\" content=\"In this article, we look at how to use the Mutex in C#, explore the types of Mutex, and how to handle errors when using it in our code\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/code-maze.com\/csharp-how-to-use-mutex-class\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Use Mutex in C# - 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