rtt中建两个线程a和b，怎么确保线程a执行完立刻切到线程b

发布于 2025-02-01 10:13:03 浏览：214 订阅该版

KunYi 2025-02-03

这家伙很懒，什么也没写！

试试看
```c
#include <rtthread.h>

rt_thread_t thread_A, thread_B;
rt_sem_t semAB;

/* 线程 A */
void thread_A_entry(void *parameter)
{
    rt_kprintf("线程A运行，当前 Tick: %d\n", rt_tick_get());
    rt_thread_mdelay(1000); // 模拟运行 1 秒
    rt_kprintf("线程A完成，当前 Tick: %d\n", rt_tick_get());

rt_sem_release(semAB); // 释放信号给 B
}

/* 线程 B */
void thread_B_entry(void *parameter)
{
    rt_kprintf("线程B等待信号，当前 Tick: %d\n", rt_tick_get());
    rt_sem_take(semAB, RT_WAITING_FOREVER); // 等待 A 完成
    rt_kprintf("线程B执行，当前 Tick: %d\n", rt_tick_get());
}

int main(void)
{
    /* 创建信号量，初始值为 0 */
    semAB = rt_sem_create("semAB", 0, RT_IPC_FLAG_FIFO);

/* 创建线程 A (优先级 10) */
    thread_A = rt_thread_create("thread_A", thread_A_entry, RT_NULL, 1024, 10, 10);
    if (thread_A != RT_NULL)
        rt_thread_startup(thread_A);

/* 创建线程 B (优先级 5，优先于 A，但需要等待信号) */
    thread_B = rt_thread_create("thread_B", thread_B_entry, RT_NULL, 1024, 5, 10);
    if (thread_B != RT_NULL)
        rt_thread_startup(thread_B);

return 0;
}

```