我自己添加一个释放多个信号量的函数，会不会对系统有影响

发布于 2022-03-19 09:31:58 浏览：650 订阅该版

照葫芦画瓢的，值改了信号量添加的个数
```c
/**
 * @brief    This function releases multiple semaphores. If there is a pending thread on the semaphore, it will be restored.
 *						此函数将释放多个信号量。如果信号量上有挂起的线程，它将被恢复。
 * @note	    如果此信号量上有挂起的线程，则此信号量对象列表中的第一个线程
*将恢复，并将执行线程调度（rt_调度）。
*如果此信号量上没有挂起线程，则此信号量的计数值sem->value将增加num。
 *
 * @param    sem is a pointer to a semaphore object.
 * @param    num is a pointer to a rt_uint32_t.一次释放信号量的个数
 * @return   Return the operation status. When the return value is RT_EOK, the operation is successful.
 *           If the return value is any other values, it means that the semaphore release failed.
 */
rt_err_t rt_sem_release_num(rt_sem_t sem,rt_uint32_t num)
{
    register rt_base_t temp;
    register rt_bool_t need_schedule;

/* parameter check */
    RT_ASSERT(sem != RT_NULL);
    RT_ASSERT(rt_object_get_type(&sem->parent.parent) == RT_Object_Class_Semaphore);

RT_OBJECT_HOOK_CALL(rt_object_put_hook, (&(sem->parent.parent)));

need_schedule = RT_FALSE;

/* disable interrupt */
    temp = rt_hw_interrupt_disable();

RT_DEBUG_LOG(RT_DEBUG_IPC, ("thread %s releases sem:%s, which value is: %d\n",
                                rt_thread_self()->name,
                                ((struct rt_object *)sem)->name,
                                sem->value));

if (!rt_list_isempty(&sem->parent.suspend_thread))
    {
        /* resume the suspended thread */
        _ipc_list_resume(&(sem->parent.suspend_thread));
        need_schedule = RT_TRUE;
    }
    else
    {
        if(sem->value < RT_SEM_VALUE_MAX)
        {
            sem->value +=num; /* increase value */
        }
        else
        {
            rt_hw_interrupt_enable(temp); /* enable interrupt */
            return -RT_EFULL; /* value overflowed */
        }
    }

/* enable interrupt */
    rt_hw_interrupt_enable(temp);

/* resume a thread, re-schedule */
    if (need_schedule == RT_TRUE)
        rt_schedule();

return RT_EOK;
}
RTM_EXPORT(rt_sem_release_num);
```