云恒制造：如何监控各个线程的资源占用情况？

嵌入式Linux开发中，有时候为了定位问题，需要查看某个进程的各个线程的运行情况。

例子

multi_thread.c：

#define _GNU_SOURCE #include #include #include #include// 线程名称最大长度 #define APP_THREAD_NAME_MAX_LEN 32// 线程索引 typedef enum _app_thread_index { APP_THREAD_INDEX_TEST0, APP_THREAD_INDEX_TEST1, APP_THREAD_INDEX_TEST2, APP_THREAD_INDEX_TEST3, APP_THREAD_INDEX_TEST4, APP_THREAD_INDEX_TEST5, APP_THREAD_INDEX_MAX }app_thread_index_e;// 线程入口函数指针类型 typedef void *(*p_thread_fun)(void *param);// 线程数据表 typedef struct _app_thread { pthread_t thread_handle; p_thread_fun thread_entry; char name[APP_THREAD_NAME_MAX_LEN]; }app_thread_s;static void *test0_thread_entry(void *param); static void *test1_thread_entry(void *param); static void *test2_thread_entry(void *param); static void *test3_thread_entry(void *param); static void *test4_thread_entry(void *param); static void *test5_thread_entry(void *param);// 线程表 app_thread_s s_app_thread_table[APP_THREAD_INDEX_MAX] = { {0, test0_thread_entry, “test0_thread”}, {0, test1_thread_entry, “test1_thread”}, {0, test2_thread_entry, “test2_thread”}, {0, test3_thread_entry, “test3_thread”}, {0, test4_thread_entry, “test4_thread”}, {0, test5_thread_entry, “test5_thread”} };static void *test0_thread_entry(void *param) { printf(“test0_thread running…\n”);while (1) { usleep(2 * 1000); }return NULL; }static void *test1_thread_entry(void *param) { printf(“test1_thread running…\n”);while (1) { usleep(2 * 1000); }return NULL; }static void *test2_thread_entry(void *param) { printf(“test2_thread running…\n”);while (1) { usleep(2 * 1000); }return NULL; }static void *test3_thread_entry(void *param) { printf(“test3_thread running…\n”);while (1) { usleep(2 * 1000); }return NULL; }static void *test4_thread_entry(void *param) { printf(“test4_thread running…\n”);while (1) { usleep(2 * 1000); }return NULL; }static void *test5_thread_entry(void *param) { printf(“test5_thread running…\n”);while (1) { usleep(2 * 1000); }return NULL; };static int create_all_app_thread(void) { int ret = 0;for (int i = 0; i < APP_THREAD_INDEX_MAX; i++) { ret = pthread_create(&s_app_thread_table[i].thread_handle, NULL, s_app_thread_table[i].thread_entry, NULL);if (0 != ret) { printf(“%s thread create error! thread_id = %ld\n”, s_app_thread_table[i].name, s_app_thread_table[i].thread_handle); return ret; } else { printf(“%s thread create success! thread_id = %ld\n”, s_app_thread_table[i].name, s_app_thread_table[i].thread_handle); pthread_setname_np(s_app_thread_table[i].thread_handle, s_app_thread_table[i].name); }pthread_detach(s_app_thread_table[i].thread_handle); }return ret; }int main(int argc, char argv) { create_all_app_thread();while (1) { usleep(2 * 1000); }return 0; }

我们可以通过top命令来查看。要在top输出中开启线程查看，请调用top命令的“-H”选项，该选项会列出所有Linux线程。

这里我们指定查看multi_thread进程的各线程运行情况，命令：

top -H -p `pidof multi_thread`