{"id":14674,"date":"2024-03-15T09:43:33","date_gmt":"2024-03-15T09:43:33","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-access-global-variables-in-c-language-threads\/"},"modified":"2025-08-06T11:55:15","modified_gmt":"2025-08-06T11:55:15","slug":"how-to-access-global-variables-in-c-language-threads","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-access-global-variables-in-c-language-threads\/","title":{"rendered":"Thread-Safe Global Variables in C"},"content":{"rendered":"<p>In the C programming language, it is important to address thread synchronization issues when multiple threads access global variables to avoid data races and unpredictable results. Here are some common methods to do so:<\/p>\n<ol>\n<li>Using mutex: before accessing global variables, the thread first acquires the mutex, and then releases it after finishing the access. This ensures that only one thread can access global variables at a time.<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><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\">int<\/span> global_variable;\r\n<span class=\"hljs-type\">pthread_mutex_t<\/span> mutex;\r\n\r\n<span class=\"hljs-type\">void<\/span>* <span class=\"hljs-title function_\">thread_function<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">void<\/span>* arg)<\/span> {\r\n    <span class=\"hljs-comment\">\/\/ \u83b7\u53d6\u4e92\u65a5\u9501<\/span>\r\n    pthread_mutex_lock(&amp;mutex);\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u8bbf\u95ee\u5168\u5c40\u53d8\u91cf<\/span>\r\n    global_variable++;\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u91ca\u653e\u4e92\u65a5\u9501<\/span>\r\n    pthread_mutex_unlock(&amp;mutex);\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-comment\">\/\/ \u521d\u59cb\u5316\u4e92\u65a5\u9501<\/span>\r\n    pthread_mutex_init(&amp;mutex, <span class=\"hljs-literal\">NULL<\/span>);\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u521b\u5efa\u7ebf\u7a0b<\/span>\r\n    <span class=\"hljs-type\">pthread_t<\/span> thread;\r\n    pthread_create(&amp;thread, <span class=\"hljs-literal\">NULL<\/span>, thread_function, <span class=\"hljs-literal\">NULL<\/span>);\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u7b49\u5f85\u7ebf\u7a0b\u7ed3\u675f<\/span>\r\n    pthread_join(thread, <span class=\"hljs-literal\">NULL<\/span>);\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u9500\u6bc1\u4e92\u65a5\u9501<\/span>\r\n    pthread_mutex_destroy(&amp;mutex);\r\n\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>Using semaphore: Set a semaphore to 1, before accessing the global variable, the thread first performs a P operation (wait), and after finishing the access, it performs a V operation (release).<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;pthread.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;semaphore.h&gt;<\/span><\/span>\r\n\r\n<span class=\"hljs-type\">int<\/span> global_variable;\r\n<span class=\"hljs-type\">sem_t<\/span> sem;\r\n\r\n<span class=\"hljs-type\">void<\/span>* <span class=\"hljs-title function_\">thread_function<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">void<\/span>* arg)<\/span> {\r\n    <span class=\"hljs-comment\">\/\/ \u7b49\u5f85\u4fe1\u53f7\u91cf<\/span>\r\n    sem_wait(&amp;sem);\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u8bbf\u95ee\u5168\u5c40\u53d8\u91cf<\/span>\r\n    global_variable++;\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u91ca\u653e\u4fe1\u53f7\u91cf<\/span>\r\n    sem_post(&amp;sem);\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-comment\">\/\/ \u521d\u59cb\u5316\u4fe1\u53f7\u91cf<\/span>\r\n    sem_init(&amp;sem, <span class=\"hljs-number\">0<\/span>, <span class=\"hljs-number\">1<\/span>);\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u521b\u5efa\u7ebf\u7a0b<\/span>\r\n    <span class=\"hljs-type\">pthread_t<\/span> thread;\r\n    pthread_create(&amp;thread, <span class=\"hljs-literal\">NULL<\/span>, thread_function, <span class=\"hljs-literal\">NULL<\/span>);\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u7b49\u5f85\u7ebf\u7a0b\u7ed3\u675f<\/span>\r\n    pthread_join(thread, <span class=\"hljs-literal\">NULL<\/span>);\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u9500\u6bc1\u4fe1\u53f7\u91cf<\/span>\r\n    sem_destroy(&amp;sem);\r\n\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>Condition variables are used by setting up a condition variable and a mutex lock. Threads use the mutex lock to protect access to global variables. Before accessing, a thread waits for the condition variable to be met, and notifies other waiting threads through the condition variable after accessing is completed.<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><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\">int<\/span> global_variable;\r\n<span class=\"hljs-type\">pthread_mutex_t<\/span> mutex;\r\n<span class=\"hljs-type\">pthread_cond_t<\/span> cond;\r\n\r\n<span class=\"hljs-type\">void<\/span>* <span class=\"hljs-title function_\">thread_function<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">void<\/span>* arg)<\/span> {\r\n    <span class=\"hljs-comment\">\/\/ \u83b7\u53d6\u4e92\u65a5\u9501<\/span>\r\n    pthread_mutex_lock(&amp;mutex);\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u7b49\u5f85\u6761\u4ef6\u53d8\u91cf\u6ee1\u8db3<\/span>\r\n    <span class=\"hljs-keyword\">while<\/span> (global_variable == <span class=\"hljs-number\">0<\/span>) {\r\n        pthread_cond_wait(&amp;cond, &amp;mutex);\r\n    }\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u8bbf\u95ee\u5168\u5c40\u53d8\u91cf<\/span>\r\n    global_variable++;\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u91ca\u653e\u4e92\u65a5\u9501<\/span>\r\n    pthread_mutex_unlock(&amp;mutex);\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-comment\">\/\/ \u521d\u59cb\u5316\u4e92\u65a5\u9501\u548c\u6761\u4ef6\u53d8\u91cf<\/span>\r\n    pthread_mutex_init(&amp;mutex, <span class=\"hljs-literal\">NULL<\/span>);\r\n    pthread_cond_init(&amp;cond, <span class=\"hljs-literal\">NULL<\/span>);\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u521b\u5efa\u7ebf\u7a0b<\/span>\r\n    <span class=\"hljs-type\">pthread_t<\/span> thread;\r\n    pthread_create(&amp;thread, <span class=\"hljs-literal\">NULL<\/span>, thread_function, <span class=\"hljs-literal\">NULL<\/span>);\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u4fee\u6539\u5168\u5c40\u53d8\u91cf\uff0c\u5e76\u53d1\u9001\u6761\u4ef6\u53d8\u91cf\u901a\u77e5<\/span>\r\n    pthread_mutex_lock(&amp;mutex);\r\n    global_variable++;\r\n    pthread_cond_signal(&amp;cond);\r\n    pthread_mutex_unlock(&amp;mutex);\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u7b49\u5f85\u7ebf\u7a0b\u7ed3\u675f<\/span>\r\n    pthread_join(thread, <span class=\"hljs-literal\">NULL<\/span>);\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u9500\u6bc1\u4e92\u65a5\u9501\u548c\u6761\u4ef6\u53d8\u91cf<\/span>\r\n    pthread_mutex_destroy(&amp;mutex);\r\n    pthread_cond_destroy(&amp;cond);\r\n\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>By using the above methods, it is possible to ensure that multiple threads can safely access global variables, avoiding data races and unpredictable results.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the C programming language, it is important to address thread synchronization issues when multiple threads access global variables to avoid data races and unpredictable results. Here are some common methods to do so: Using mutex: before accessing global variables, the thread first acquires the mutex, and then releases it after finishing the access. This [&hellip;]<\/p>\n","protected":false},"author":8,"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":[381,19826,9733,13315,218],"class_list":["post-14674","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-c-programming","tag-data-races","tag-global-variables","tag-mutex","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>Thread-Safe Global Variables in C - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Safely access global variables in C threads using mutexes. 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