Thread开发实例

1、内核编程开发——Thread多线程

在Niobe WIFI IoT开发板上使用smsis 2.0 接口进行多线程开发

Thread API分析

osThreadNew()

osThreadId_t osThreadNew(osThreadFunc_tfunc, void *argument,const osThreadAttr_t *attr )

描述：

线程函数

参数：

软件设计

主要代码分析

在OS_Thread_example函数中，通过osThreadNew()函数创建了thread1和thread2两个进程，thread1和thread2启动后会输出打印日志。

void thread_entry1(void)
{
    int sum=0;
    while (1)
    {
        /* 示例代码 */
        printf("This is Niobe Thread1----%d\r\n",sum++);
        usleep(500000);
    }
}
​
void thread_entry2(void)
{
    int sum=0;
    while (1)
    {
       /* 示例代码 */
        printf("This is Niobe Thread2----%d\r\n",sum++);
        usleep(500000);
    }
}
​
static void OS_Thread_example(void)
{
    osThreadAttr_t attr;
​
    attr.name = "thread1";
    attr.attr_bits = 0U;
    attr.cb_mem = NULL;
    attr.cb_size = 0U;
    attr.stack_mem = NULL;
    attr.stack_size = 1024*4;
    attr.priority = 25;
​
    if (osThreadNew((osThreadFunc_t)thread_entry1, NULL, &attr) == NULL) {
        printf("Falied to create thread1!\n");
    }
​
    attr.name = "thread2";
​
    if (osThreadNew((osThreadFunc_t)thread_entry2, NULL, &attr) == NULL) {
        printf("Falied to create thread2!\n");
    }
}
编译调试
修改 BUILD.gn 文件
修改 applications\app路径下 BUILD.gn 文件，指定 os_thread_example 参与编译。
​
#"TW001_OS_helloworld:helloworld_example",
"TW002_OS_thread:os_thread_example",
#"TW003_OS_timer:os_timer_example",
#"TW004_OS_event:os_event_example",
#"TW005_OS_mutex:os_mutex_example",
#"TW006_OS_semp:os_semaphore_example",
#"TW007_OS_message:os_message_example",

运行结果

示例代码编译烧录代码后，按下开发板的RESET按键，通过串口助手查看日志，Thread1和Thread2会交替打印信息，显示如下

This is Niobe Thread1----2
This is Niobe Thread2----5
This is Niobe Thread1----3
This is Niobe Thread2----6