rt-thread/examples/kernel/mbox_send_wait.c

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/*
* 程序清单邮箱例程_发送阻塞
*
* 这个程序用来测试邮箱发送时候的阻塞情况。
*
*/
#include <rtthread.h>
#include "tc_comm.h"
/* 指向线程控制块的指针 */
static rt_thread_t tid1 = RT_NULL;
static rt_thread_t tid2 = RT_NULL;
/* 邮箱控制块 */
static struct rt_mailbox mb;
/* 用于放邮件的内存池 */
static char mb_pool[32];
static char mb_str1[] = "I'm a mail!";
static char mb_str2[] = "this is another mail!";
/* 线程1入口 */
static void thread1_entry(void* parameter)
{
unsigned char* str;
while (1)
{
/* 从邮箱中收取邮件 */
if (rt_mb_recv(&mb, (rt_uint32_t*)&str, RT_WAITING_FOREVER) == RT_EOK)
{
rt_kprintf("thread1: get a mail from mailbox, the content:%s\n", str);
/* 延时20个OS Tick */
rt_thread_delay(50);
}
}
}
/* 线程2入口 */
static void thread2_entry(void* parameter)
{
rt_uint8_t count;
char *str;
count = 0;
while (1)
{
count ++;
if (count & 0x1)
{
/* 发送mb_str1地址到邮箱中 */
str = mb_str1;
}
else
{
/* 发送mb_str2地址到邮箱中 */
str = mb_str2;
}
/* 不停的发送邮件如果满了则等待10个tick然后超时 */
if( rt_mb_send_wait(&mb, (rt_uint32_t)str,10) == RT_EOK )
rt_kprintf("thread2: sent a mail to mailbox, the content:%s\n", str);
else
rt_kprintf("thread2: timeout while waiting to send a mail.\n");
}
}
int mbox_send_wait_init()
{
/* 初始化一个mailbox */
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, /* 大小是mb_pool大小除以4因为一封邮件的大小是4字节 */
RT_IPC_FLAG_FIFO); /* 采用FIFO方式进行线程等待 */
/* 创建线程1 */
tid1 = rt_thread_create("t1",
thread1_entry, RT_NULL, /* 线程入口是thread1_entry, 入口参数是RT_NULL */
THREAD_STACK_SIZE, THREAD_PRIORITY, THREAD_TIMESLICE);
if (tid1 != RT_NULL)
rt_thread_startup(tid1);
else
tc_stat(TC_STAT_END | TC_STAT_FAILED);
/* 创建线程2 */
tid2 = rt_thread_create("t2",
thread2_entry, RT_NULL, /* 线程入口是thread2_entry, 入口参数是RT_NULL */
THREAD_STACK_SIZE, THREAD_PRIORITY, THREAD_TIMESLICE);
if (tid2 != RT_NULL)
rt_thread_startup(tid2);
else
tc_stat(TC_STAT_END | TC_STAT_FAILED);
return 0;
}
#ifdef RT_USING_TC
static void _tc_cleanup()
{
/* 调度器上锁,上锁后,将不再切换到其他线程,仅响应中断 */
rt_enter_critical();
/* 删除线程 */
if (tid1 != RT_NULL && tid1->stat != RT_THREAD_CLOSE)
rt_thread_delete(tid1);
if (tid2 != RT_NULL && tid2->stat != RT_THREAD_CLOSE)
rt_thread_delete(tid2);
/* 执行邮箱对象脱离 */
rt_mb_detach(&mb);
/* 调度器解锁 */
rt_exit_critical();
/* 设置TestCase状态 */
tc_done(TC_STAT_PASSED);
}
int _tc_mbox_send_wait()
{
/* 设置TestCase清理回调函数 */
tc_cleanup(_tc_cleanup);
mbox_send_wait_init();
/* 返回TestCase运行的最长时间 */
return 300;
}
/* 输出函数命令到finsh shell中 */
FINSH_FUNCTION_EXPORT(_tc_mbox_send_wait, a example of mailbox send wait);
#else
/* 用户应用入口 */
int rt_application_init()
{
mbox_send_wait_init();
return 0;
}
#endif