140 lines
4.3 KiB
C
140 lines
4.3 KiB
C
|
/*
|
|||
|
|
* 程序清单：消息队列例程
|
|||
|
|
*
|
|||
|
|
* 这个程序会创建2个动态线程，一个线程会从消息队列中收取消息；一个线程会定时给消
|
|||
|
|
* 息队列发送 普通消息和紧急消息。
|
|||
|
|
*/
|
|||
|
|
#include <rtthread.h>
|
|||
|
|
|
|||
|
|
#define THREAD_PRIORITY 25
|
|||
|
|
#define THREAD_TIMESLICE 5
|
|||
|
|
|
|||
|
|
/* 消息队列控制块 */
|
|||
|
|
static struct rt_messagequeue mq;
|
|||
|
|
/* 消息队列中用到的放置消息的内存池 */
|
|||
|
|
static rt_uint8_t msg_pool[2048];
|
|||
|
|
|
|||
|
|
static char thread1_stack[1024];
|
|||
|
|
static struct rt_thread thread1;
|
|||
|
|
|
|||
|
|
/* 线程1入口函数 */
|
|||
|
|
static void thread1_entry(void *parameter)
|
|||
|
|
{
|
|||
|
|
char buf = 0; // 用于接收消息的缓冲区
|
|||
|
|
rt_uint8_t cnt = 0; // 消息计数器
|
|||
|
|
|
|||
|
|
while (1)
|
|||
|
|
{
|
|||
|
|
/* 从消息队列中接收消息 */
|
|||
|
|
if (rt_mq_recv(&mq, &buf, sizeof(buf), RT_WAITING_FOREVER) > 0)
|
|||
|
|
{
|
|||
|
|
rt_kprintf("thread1: recv msg from msg queue, the content: %c\n", buf);
|
|||
|
|
if (cnt == 19)
|
|||
|
|
{
|
|||
|
|
break; // 接收20次消息后退出
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
/* 延时50ms */
|
|||
|
|
cnt++;
|
|||
|
|
rt_thread_mdelay(50);
|
|||
|
|
}
|
|||
|
|
rt_kprintf("thread1: detach mq \n");
|
|||
|
|
rt_mq_detach(&mq); // 脱离消息队列
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
static char thread2_stack[1024];
|
|||
|
|
static struct rt_thread thread2;
|
|||
|
|
|
|||
|
|
/* 线程2入口 */
|
|||
|
|
static void thread2_entry(void *parameter)
|
|||
|
|
{
|
|||
|
|
int result;
|
|||
|
|
char buf = 'A'; // 要发送的消息内容
|
|||
|
|
rt_uint8_t cnt = 0; // 消息计数器
|
|||
|
|
|
|||
|
|
while (1)
|
|||
|
|
{
|
|||
|
|
if (cnt == 8)
|
|||
|
|
{
|
|||
|
|
/* 发送紧急消息到消息队列中 */
|
|||
|
|
result = rt_mq_urgent(&mq, &buf, 1);
|
|||
|
|
if (result != RT_EOK)
|
|||
|
|
{
|
|||
|
|
rt_kprintf("rt_mq_urgent ERR\n");
|
|||
|
|
}
|
|||
|
|
else
|
|||
|
|
{
|
|||
|
|
rt_kprintf("thread2: send urgent message - %c\n", buf);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
else if (cnt >= 20) /* 发送20次消息之后退出 */
|
|||
|
|
{
|
|||
|
|
rt_kprintf("message queue stop send, thread2 quit\n");
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
else
|
|||
|
|
{
|
|||
|
|
/* 发送消息到消息队列中 */
|
|||
|
|
result = rt_mq_send(&mq, &buf, 1);
|
|||
|
|
if (result != RT_EOK)
|
|||
|
|
{
|
|||
|
|
rt_kprintf("rt_mq_send ERR\n");
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
rt_kprintf("thread2: send message - %c\n", buf);
|
|||
|
|
}
|
|||
|
|
buf++;
|
|||
|
|
cnt++;
|
|||
|
|
/* 延时5ms */
|
|||
|
|
rt_thread_mdelay(5);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/* 消息队列示例的初始化 */
|
|||
|
|
int msgq_sample(void)
|
|||
|
|
{
|
|||
|
|
rt_err_t result;
|
|||
|
|
|
|||
|
|
/* 初始化消息队列 */
|
|||
|
|
result = rt_mq_init(&mq,
|
|||
|
|
"mqt", /* 名称是mqt */
|
|||
|
|
&msg_pool[0], /* 内存池指向msg_pool */
|
|||
|
|
1, /* 每个消息的大小是1字节 */
|
|||
|
|
sizeof(msg_pool), /* 内存池的大小是msg_pool的大小 */
|
|||
|
|
RT_IPC_FLAG_PRIO); /* 如果有多个线程等待，按照优先级的方式分配消息 */
|
|||
|
|
|
|||
|
|
if (result != RT_EOK)
|
|||
|
|
{
|
|||
|
|
rt_kprintf("init message queue failed.\n");
|
|||
|
|
return -1;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/* 初始化线程1 */
|
|||
|
|
rt_thread_init(&thread1,
|
|||
|
|
"thread1", /* 线程名称 */
|
|||
|
|
thread1_entry, /* 线程入口函数 */
|
|||
|
|
RT_NULL, /* 入口函数参数 */
|
|||
|
|
&thread1_stack[0], /* 线程栈起始地址 */
|
|||
|
|
sizeof(thread1_stack), /* 线程栈大小 */
|
|||
|
|
THREAD_PRIORITY, THREAD_TIMESLICE); /* 线程优先级和时间片大小 */
|
|||
|
|
|
|||
|
|
/* 启动线程1 */
|
|||
|
|
rt_thread_startup(&thread1);
|
|||
|
|
|
|||
|
|
/* 初始化线程2 */
|
|||
|
|
rt_thread_init(&thread2,
|
|||
|
|
"thread2", /* 线程名称 */
|
|||
|
|
thread2_entry, /* 线程入口函数 */
|
|||
|
|
RT_NULL, /* 入口函数参数 */
|
|||
|
|
&thread2_stack[0], /* 线程栈起始地址 */
|
|||
|
|
sizeof(thread2_stack), /* 线程栈大小 */
|
|||
|
|
THREAD_PRIORITY-1, THREAD_TIMESLICE); /* 线程优先级和时间片大小 */
|
|||
|
|
|
|||
|
|
/* 启动线程2 */
|
|||
|
|
rt_thread_startup(&thread2);
|
|||
|
|
|
|||
|
|
return 0;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/* 导出到 msh 命令列表中 */
|
|||
|
|
MSH_CMD_EXPORT(msgq_sample, msgq sample);
|