How can the current task be suspended in ucos?

2 years ago
Sophia Anderson
1 minute

In uCOS, it is possible to suspend the current task using the function OSTaskSuspend(). The prototype of this function is:

void OSTaskSuspend (OS_TCB *ptcb, OS_ERR *perr);

In this case, ptcb is a pointer to the task control block (TCB) that indicates the task to be suspended. Passing NULL as a parameter suspends the current task. perr is a pointer to an error code, used to return the result of the function execution.

Here is an example code using the OSTaskSuspend() function to suspend the current task.

void TaskA (void *p_arg)
{
    // 执行任务A的操作
    
    // 挂起当前任务
    OSTaskSuspend(NULL, &err);
    
    // 任务A的其他操作
}

void main (void)
{
    // 初始化uCOS
    
    // 创建任务A
    
    // 启动任务调度
    
    while (1) {
        // 主循环
    }
}

In the example code above, when Task A reaches OSTaskSuspend(NULL, &err), the current task will be suspended and other tasks will be executed or it will wait for events to occur. The suspended task can be resumed by other tasks or interrupts.

bannerAds