{"id":17111,"date":"2024-03-15T14:18:12","date_gmt":"2024-03-15T14:18:12","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-make-setlocale-take-effect-on-threads\/"},"modified":"2025-08-07T08:36:17","modified_gmt":"2025-08-07T08:36:17","slug":"how-to-make-setlocale-take-effect-on-threads","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-make-setlocale-take-effect-on-threads\/","title":{"rendered":"How to make setlocale take effect on threads?"},"content":{"rendered":"<p>To make the locale setting effective in a program, you can use the function std::setlocale() in the thread. Below is an example code:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;iostream&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;thread&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;locale&gt;<\/span><\/span>\r\n\r\n<span class=\"hljs-function\"><span class=\"hljs-type\">void<\/span> <span class=\"hljs-title\">threadFunction<\/span><span class=\"hljs-params\">()<\/span>\r\n<\/span>{\r\n    std::<span class=\"hljs-built_in\">setlocale<\/span>(LC_ALL, <span class=\"hljs-string\">\"\"<\/span>); <span class=\"hljs-comment\">\/\/ \u8bbe\u7f6elocale<\/span>\r\n    std::cout.<span class=\"hljs-built_in\">imbue<\/span>(std::<span class=\"hljs-built_in\">locale<\/span>()); <span class=\"hljs-comment\">\/\/ \u5e94\u7528locale\u5230\u8f93\u51fa\u6d41<\/span>\r\n    std::cout &lt;&lt; <span class=\"hljs-string\">\"\u7ebf\u7a0b\u4e2d\u7684locale\u8bbe\u7f6e\u751f\u6548\u4e86\uff01\"<\/span> &lt;&lt; std::endl;\r\n}\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>\r\n<\/span>{\r\n    <span class=\"hljs-function\">std::thread <span class=\"hljs-title\">t<\/span><span class=\"hljs-params\">(threadFunction)<\/span><\/span>;\r\n    t.<span class=\"hljs-built_in\">join<\/span>();\r\n    \r\n    std::cout &lt;&lt; <span class=\"hljs-string\">\"\u4e3b\u7ebf\u7a0b\u4e2d\u7684locale\u8bbe\u7f6e\u6ca1\u6709\u751f\u6548\uff01\"<\/span> &lt;&lt; std::endl;\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 this example code, the threadFunction() function is executed in a new thread. Inside this function, we first call std::setlocale(LC_ALL, &#8220;&#8221;) to set the locale, and then use std::cout.imbue(std::locale()) to apply the locale to the output stream. This way, the output in the thread will be formatted according to the set locale.<\/p>\n<p>Please note that the std::setlocale() function is not reentrant in a multi-threaded environment and may lead to race conditions. Therefore, caution should be taken when using std::setlocale() in a multi-threaded program.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>To make the locale setting effective in a program, you can use the function std::setlocale() in the thread. Below is an example code: #include &lt;iostream&gt; #include &lt;thread&gt; #include &lt;locale&gt; void threadFunction() { std::setlocale(LC_ALL, &#8220;&#8221;); \/\/ \u8bbe\u7f6elocale std::cout.imbue(std::locale()); \/\/ \u5e94\u7528locale\u5230\u8f93\u51fa\u6d41 std::cout &lt;&lt; &#8220;\u7ebf\u7a0b\u4e2d\u7684locale\u8bbe\u7f6e\u751f\u6548\u4e86\uff01&#8221; &lt;&lt; std::endl; } int main() { std::thread t(threadFunction); t.join(); std::cout &lt;&lt; &#8220;\u4e3b\u7ebf\u7a0b\u4e2d\u7684locale\u8bbe\u7f6e\u6ca1\u6709\u751f\u6548\uff01&#8221; &lt;&lt; [&hellip;]<\/p>\n","protected":false},"author":7,"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":[453,1402,299,1404,1403],"class_list":["post-17111","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-development","tag-guide","tag-programming","tag-technology","tag-tutorial"],"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>How to make setlocale take effect on threads? - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn about how to make setlocale take effect on threads?. 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