{"id":8667,"date":"2024-03-14T08:30:17","date_gmt":"2024-03-14T08:30:17","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-use-entercriticalsection-in-c\/"},"modified":"2025-08-03T08:04:59","modified_gmt":"2025-08-03T08:04:59","slug":"how-to-use-entercriticalsection-in-c","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-use-entercriticalsection-in-c\/","title":{"rendered":"C++ Thread Sync: EnterCriticalSection"},"content":{"rendered":"<p>In C++, EnterCriticalSection is a critical section locking mechanism provided by the Windows API. It is used to restrict access to shared resources to ensure that only one thread can access the resource at any given time.<\/p>\n<p>Here are the basic steps for using EnterCriticalSection:<\/p>\n<ol>\n<li>First, define a CRITICAL_SECTION object to represent the critical section.<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code>CRITICAL_SECTION cs;\r\n<\/code><\/pre>\n<ol>\n<li>Use the EnterCriticalSection function to lock the critical section in places where protection of shared resources is required.<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-built_in\">EnterCriticalSection<\/span>(&amp;cs);\r\n<\/code><\/pre>\n<ol>\n<li>Perform operations on shared resources.<\/li>\n<li>Release the critical section using the LeaveCriticalSection function.<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-built_in\">LeaveCriticalSection<\/span>(&amp;cs);\r\n<\/code><\/pre>\n<p>The complete example code is shown below:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;Windows.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;iostream&gt;<\/span><\/span>\r\n\r\nCRITICAL_SECTION cs;\r\n\r\n<span class=\"hljs-function\"><span class=\"hljs-type\">int<\/span> <span class=\"hljs-title\">main<\/span><span class=\"hljs-params\">()<\/span> <\/span>{\r\n    <span class=\"hljs-comment\">\/\/ \u521d\u59cb\u5316\u4e34\u754c\u533a<\/span>\r\n    <span class=\"hljs-built_in\">InitializeCriticalSection<\/span>(&amp;cs);\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u8fdb\u5165\u4e34\u754c\u533a<\/span>\r\n    <span class=\"hljs-built_in\">EnterCriticalSection<\/span>(&amp;cs);\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u8bbf\u95ee\u5171\u4eab\u8d44\u6e90<\/span>\r\n    std::cout &lt;&lt; <span class=\"hljs-string\">\"Accessing shared resource\"<\/span> &lt;&lt; std::endl;\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u79bb\u5f00\u4e34\u754c\u533a<\/span>\r\n    <span class=\"hljs-built_in\">LeaveCriticalSection<\/span>(&amp;cs);\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u9500\u6bc1\u4e34\u754c\u533a<\/span>\r\n    <span class=\"hljs-built_in\">DeleteCriticalSection<\/span>(&amp;cs);\r\n\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>Please note that EnterCriticalSection and LeaveCriticalSection must be used in pairs and the operations on shared resources should be performed within the critical section. Also, it is necessary to call DeleteCriticalSection before the program ends to destroy the critical section.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In C++, EnterCriticalSection is a critical section locking mechanism provided by the Windows API. It is used to restrict access to shared resources to ensure that only one thread can access the resource at any given time. Here are the basic steps for using EnterCriticalSection: First, define a CRITICAL_SECTION object to represent the critical section. [&hellip;]<\/p>\n","protected":false},"author":9,"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":[274,11788,391,218,7040],"class_list":["post-8667","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-c","tag-entercriticalsection","tag-multi-threading","tag-thread-synchronization","tag-windows-api"],"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++ Thread Sync: EnterCriticalSection - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn how to use EnterCriticalSection in C++ for thread synchronization. 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