RT-Thread API参考手册  3.1.1
嵌入式实时操作系统
mailbox_sample.c
/*
* Copyright (c) 2006-2018, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2018-08-24 yangjie the first version
*/
/*
* 程序清单:邮箱例程
*
* 这个程序会创建2个动态线程,一个静态的邮箱对象,其中一个线程往邮箱中发送邮件,
* 一个线程往邮箱中收取邮件。
*/
#include <rtthread.h>
#define THREAD_PRIORITY 10
#define THREAD_TIMESLICE 5
/* 邮箱控制块 */
static struct rt_mailbox mb;
/* 用于放邮件的内存池 */
static char mb_pool[128];
static char mb_str1[] = "I'm a mail!";
static char mb_str2[] = "this is another mail!";
static char mb_str3[] = "over";
ALIGN(RT_ALIGN_SIZE)
static char thread1_stack[1024];
static struct rt_thread thread1;
/* 线程1入口 */
static void thread1_entry(void *parameter)
{
char *str;
while (1)
{
rt_kprintf("thread1: try to recv a mail\n");
/* 从邮箱中收取邮件 */
{
rt_kprintf("thread1: get a mail from mailbox, the content:%s\n", str);
if (str == mb_str3)
break;
/* 延时100ms */
}
}
/* 执行邮箱对象脱离 */
}
ALIGN(RT_ALIGN_SIZE)
static char thread2_stack[1024];
static struct rt_thread thread2;
/* 线程2入口 */
static void thread2_entry(void *parameter)
{
rt_uint8_t count;
count = 0;
while (count < 10)
{
count ++;
if (count & 0x1)
{
/* 发送mb_str1地址到邮箱中 */
rt_mb_send(&mb, (rt_uint32_t)&mb_str1);
}
else
{
/* 发送mb_str2地址到邮箱中 */
rt_mb_send(&mb, (rt_uint32_t)&mb_str2);
}
/* 延时200ms */
}
/* 发送邮件告诉线程1,线程2已经运行结束 */
rt_mb_send(&mb, (rt_uint32_t)&mb_str3);
}
int mailbox_sample(void)
{
rt_err_t result;
/* 初始化一个mailbox */
result = rt_mb_init(&mb,
"mbt", /* 名称是mbt */
&mb_pool[0], /* 邮箱用到的内存池是mb_pool */
sizeof(mb_pool) / 4, /* 邮箱中的邮件数目,因为一封邮件占4字节 */
RT_IPC_FLAG_FIFO); /* 采用FIFO方式进行线程等待 */
if (result != RT_EOK)
{
rt_kprintf("init mailbox failed.\n");
return -1;
}
rt_thread_init(&thread1,
"thread1",
thread1_entry,
&thread1_stack[0],
sizeof(thread1_stack),
THREAD_PRIORITY, THREAD_TIMESLICE);
rt_thread_startup(&thread1);
rt_thread_init(&thread2,
"thread2",
thread2_entry,
&thread2_stack[0],
sizeof(thread2_stack),
THREAD_PRIORITY, THREAD_TIMESLICE);
rt_thread_startup(&thread2);
return 0;
}
/* 导出到 msh 命令列表中 */
MSH_CMD_EXPORT(mailbox_sample, mailbox sample);