{"id":14683,"date":"2024-03-15T09:44:06","date_gmt":"2024-03-15T09:44:06","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/what-is-the-method-of-adding-locks-in-multi-threaded-programming-in-c-language\/"},"modified":"2025-08-06T12:02:06","modified_gmt":"2025-08-06T12:02:06","slug":"what-is-the-method-of-adding-locks-in-multi-threaded-programming-in-c-language","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/what-is-the-method-of-adding-locks-in-multi-threaded-programming-in-c-language\/","title":{"rendered":"C Multi-threading: Implementing Mutex Locks"},"content":{"rendered":"<p>In C language, you can use Mutex to implement locking for multi-threading.<\/p>\n<p>The general steps for using a mutex are as follows:<\/p>\n<ol>\n<li>To define a mutex variable in the program, you can use a variable of type pthread_mutex_t to represent the mutex.<\/li>\n<li>Use the pthread_mutex_lock function to lock the mutex in places where shared resources need protection.<\/li>\n<li>Operate on shared resources.<\/li>\n<li>Unlock the mutex by using the pthread_mutex_unlock function.<\/li>\n<\/ol>\n<p>The sample code is as follows:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;stdio.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;pthread.h&gt;<\/span><\/span>\r\n\r\n<span class=\"hljs-type\">pthread_mutex_t<\/span> mutex;  <span class=\"hljs-comment\">\/\/ \u5b9a\u4e49\u4e92\u65a5\u9501<\/span>\r\n\r\n<span class=\"hljs-type\">void<\/span>* <span class=\"hljs-title function_\">thread_func<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">void<\/span>* arg)<\/span> {\r\n    pthread_mutex_lock(&amp;mutex);  <span class=\"hljs-comment\">\/\/ \u52a0\u9501<\/span>\r\n    <span class=\"hljs-comment\">\/\/ \u5bf9\u5171\u4eab\u8d44\u6e90\u8fdb\u884c\u64cd\u4f5c<\/span>\r\n    <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"Thread #%ld is working...\\n\"<\/span>, (<span class=\"hljs-type\">long<\/span>)arg);\r\n    pthread_mutex_unlock(&amp;mutex);  <span class=\"hljs-comment\">\/\/ \u89e3\u9501<\/span>\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-literal\">NULL<\/span>;\r\n}\r\n\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">()<\/span> {\r\n    <span class=\"hljs-type\">pthread_t<\/span> thread1, thread2;\r\n    \r\n    pthread_mutex_init(&amp;mutex, <span class=\"hljs-literal\">NULL<\/span>);  <span class=\"hljs-comment\">\/\/ \u521d\u59cb\u5316\u4e92\u65a5\u9501<\/span>\r\n    \r\n    pthread_create(&amp;thread1, <span class=\"hljs-literal\">NULL<\/span>, thread_func, (<span class=\"hljs-type\">void<\/span>*)<span class=\"hljs-number\">1<\/span>);\r\n    pthread_create(&amp;thread2, <span class=\"hljs-literal\">NULL<\/span>, thread_func, (<span class=\"hljs-type\">void<\/span>*)<span class=\"hljs-number\">2<\/span>);\r\n    \r\n    pthread_join(thread1, <span class=\"hljs-literal\">NULL<\/span>);\r\n    pthread_join(thread2, <span class=\"hljs-literal\">NULL<\/span>);\r\n    \r\n    pthread_mutex_destroy(&amp;mutex);  <span class=\"hljs-comment\">\/\/ \u9500\u6bc1\u4e92\u65a5\u9501<\/span>\r\n    \r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>In the example above, a mutex variable is defined, and lock and unlock operations are performed on the mutex variable in two threads. This ensures that only one thread can access the shared resource at any given time.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In C language, you can use Mutex to implement locking for multi-threading. The general steps for using a mutex are as follows: To define a mutex variable in the program, you can use a variable of type pthread_mutex_t to represent the mutex. Use the pthread_mutex_lock function to lock the mutex in places where shared resources [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[381,391,13315,19836,218],"class_list":["post-14683","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-c-programming","tag-multi-threading","tag-mutex","tag-pthread","tag-thread-synchronization"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>C Multi-threading: Implementing Mutex Locks - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn how to implement mutex locks in C multi-threading. 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