{"id":8003,"date":"2024-03-14T07:25:48","date_gmt":"2024-03-14T07:25:48","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-set-thread-priority-in-linux\/"},"modified":"2025-08-02T23:27:40","modified_gmt":"2025-08-02T23:27:40","slug":"how-to-set-thread-priority-in-linux","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-set-thread-priority-in-linux\/","title":{"rendered":"Linux Thread Priority Guide: pthread_setschedparam"},"content":{"rendered":"

In Linux, the priority of a thread can be set by calling the function pthread_setschedparam(). This function takes three parameters: the thread identifier, the scheduling policy, and the priority.<\/p>\n

There are several types of scheduling strategies, including:<\/p>\n

    \n
  1. SCHED_FIFO: First In First Out scheduling policy, where the thread with the highest priority will continue running until it voluntarily releases the CPU.<\/li>\n
  2. SCHED_RR: A round-robin scheduling strategy where threads with higher priority run for a period of time before switching to the next thread of the same priority.<\/li>\n
  3. SCHED_OTHER: Standard scheduling policy.<\/li>\n<\/ol>\n

    The range of priority levels is usually between 0-99, with smaller numbers indicating higher priority. It is important to note that in Linux, only privileged processes (such as the root user) can set higher priorities.<\/p>\n

    Here is an example of code for setting thread priority:<\/p>\n

    #include <pthread.h>\r\n\r\nint main() {\r\n    pthread_t thread;\r\n    pthread_attr_t attr;\r\n    struct sched_param param;\r\n\r\n    pthread_attr_init(&attr);\r\n    \r\n    \/\/ \u8bbe\u7f6e\u7ebf\u7a0b\u8c03\u5ea6\u7b56\u7565\u4e3aSCHED_FIFO\r\n    pthread_attr_setschedpolicy(&attr, SCHED_FIFO);\r\n    \r\n    \/\/ \u8bbe\u7f6e\u7ebf\u7a0b\u4f18\u5148\u7ea7\u4e3a50\r\n    param.sched_priority = 50;\r\n    pthread_attr_setschedparam(&attr, &param);\r\n    \r\n    \/\/ \u521b\u5efa\u7ebf\u7a0b\u5e76\u8bbe\u7f6e\u5c5e\u6027\r\n    pthread_create(&thread, &attr, myThreadFunction, NULL);\r\n    \r\n    pthread_join(thread, NULL);\r\n    \r\n    pthread_attr_destroy(&attr);\r\n\r\n    return 0;\r\n}\r\n<\/code><\/pre>\n
    In the above code, the thread’s scheduling policy is set to SCHED_FIFO and priority is set to 50 using the pthread_attr_setschedparam() function. When creating the thread, the preset attributes are used to give the thread the specified priority.<\/p>\n
    Please be careful when setting thread priorities, as setting them too high may lead to system instability or deadlocks.<\/p>\n","protected":false},"excerpt":{"rendered":"
    In Linux, the priority of a thread can be set by calling the function pthread_setschedparam(). This function takes three parameters: the thread identifier, the scheduling policy, and the priority. There are several types of scheduling strategies, including: SCHED_FIFO: First In First Out scheduling policy, where the thread with the highest priority will continue running until […]<\/p>\n","protected":false},"author":14,"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":[4677,10507,10508,10509,10510],"class_list":["post-8003","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-linux-scheduling","tag-linux-thread-priority","tag-pthread_setschedparam","tag-sched_fifo","tag-sched_rr"],"yoast_head":"\nLinux Thread Priority Guide: pthread_setschedparam - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn how to set thread priority in Linux using pthread_setschedparam(). 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