{"id":10129,"date":"2024-03-14T11:36:25","date_gmt":"2024-03-14T11:36:25","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-can-two-functions-run-in-parallel-in-the-c-language\/"},"modified":"2025-08-03T19:34:31","modified_gmt":"2025-08-03T19:34:31","slug":"how-can-two-functions-run-in-parallel-in-the-c-language","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-can-two-functions-run-in-parallel-in-the-c-language\/","title":{"rendered":"C Multithreading: Parallel Functions Guide"},"content":{"rendered":"<p>In C programming, it is possible to use multithreading to allow two functions to run in parallel. The pthread library can be used to create threads and have the two functions run in separate threads.<\/p>\n<p>Here is an example code that utilizes the pthread library to create two threads and execute two functions in parallel.<\/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\">void<\/span>* <span class=\"hljs-title function_\">func1<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">void<\/span>* arg)<\/span> {\r\n    <span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-type\">int<\/span> i = <span class=\"hljs-number\">0<\/span>; i &lt; <span class=\"hljs-number\">10<\/span>; i++) {\r\n        <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"Function 1: %d\\n\"<\/span>, i);\r\n    }\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-literal\">NULL<\/span>;\r\n}\r\n\r\n<span class=\"hljs-type\">void<\/span>* <span class=\"hljs-title function_\">func2<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">void<\/span>* arg)<\/span> {\r\n    <span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-type\">int<\/span> i = <span class=\"hljs-number\">0<\/span>; i &lt; <span class=\"hljs-number\">10<\/span>; i++) {\r\n        <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"Function 2: %d\\n\"<\/span>, i);\r\n    }\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_create(&amp;thread1, <span class=\"hljs-literal\">NULL<\/span>, func1, <span class=\"hljs-literal\">NULL<\/span>);\r\n    pthread_create(&amp;thread2, <span class=\"hljs-literal\">NULL<\/span>, func2, <span class=\"hljs-literal\">NULL<\/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    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>In the code above, we have defined two functions, func1 and func2, and created two threads in the main function using the pthread_create function to execute these functions. Finally, we use the pthread_join function to wait for the two threads to finish execution and reclaim resources.<\/p>\n<p>By using multithreading, we can allow two functions to execute in parallel, thus improving the performance and efficiency of the program.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In C programming, it is possible to use multithreading to allow two functions to run in parallel. The pthread library can be used to create threads and have the two functions run in separate threads. Here is an example code that utilizes the pthread library to create two threads and execute two functions in parallel. [&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":[381,450,492,1400,12474],"class_list":["post-10129","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-c-programming","tag-c-tutorial","tag-multithreading","tag-parallel-processing","tag-pthreads"],"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 Multithreading: Parallel Functions Guide - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn how to run C functions in parallel using pthreads. 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