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git-svn-id: https://rt-thread.googlecode.com/svn/trunk@525 bbd45198-f89e-11dd-88c7-29a3b14d5316
This commit is contained in:
bernard.xiong
2010-03-23 09:45:58 +00:00
parent 8d19f32ac2
commit 8d4da31b8e
7 changed files with 141 additions and 44 deletions
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examples/kernel/messageq_simple.c
+29 -10
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@@ -1,7 +1,8 @@
/*
* 程序清单：动态线程
* 程序清单：消息队列例程
*
* 这个程序会初始化2个动态线程，它们拥有共同的入口函数，但参数不相同
* 这个程序会创建3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
* 息队列发送消息；一个线程会定时给消息队列发送紧急消息。
*/
#include <rtthread.h>
#include "tc_comm.h"
@@ -11,9 +12,12 @@ static rt_thread_t tid1 = RT_NULL;
static rt_thread_t tid2 = RT_NULL;
static rt_thread_t tid3 = RT_NULL;
/* 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 char msg_pool[2048];
/* 线程1入口函数 */
static void thread1_entry(void* parameter)
{
char buf[128];
@@ -22,15 +26,18 @@ static void thread1_entry(void* parameter)
{
rt_memset(&buf[0], 0, sizeof(buf));
/* 从消息队列中接收消息 */
if (rt_mq_recv(&mq, &buf[0], sizeof(buf), RT_WAITING_FOREVER) == RT_EOK)
{
rt_kprintf("thread1: recv msg from message queue, the content:%s\n", buf);
}
rt_thread_delay(100);
/* 延迟10个OS Tick */
rt_thread_delay(10);
}
}
/* 线程2入口函数 */
static void thread2_entry(void* parameter)
{
int i, result;
@@ -43,18 +50,22 @@ static void thread2_entry(void* parameter)
buf[sizeof(buf) - 2] = '0' + i;
rt_kprintf("thread2: send message - %s\n", buf);
/* 发送消息到消息队列中 */
result = rt_mq_send(&mq, &buf[0], sizeof(buf));
if ( result == -RT_EFULL);
if ( result == -RT_EFULL)
{
rt_kprintf("message queue full, delay 10s\n");
rt_thread_delay(1000);
/* 消息队列满， 延迟1s时间 */
rt_kprintf("message queue full, delay 1s\n");
rt_thread_delay(100);
}
}
rt_thread_delay(100);
/* 延时10个OS Tick */
rt_thread_delay(10);
}
}
/* 线程3入口函数 */
static void thread3_entry(void* parameter)
{
char buf[] = "this is an urgent message!";
@@ -62,15 +73,23 @@ static void thread3_entry(void* parameter)
while (1)
{
rt_kprintf("thread3: send an urgent message\n");
/* 发送紧急消息到消息队列中 */
rt_mq_urgent(&mq, &buf[0], sizeof(buf));
rt_thread_delay(250);
/* 延时25个OS Tick */
rt_thread_delay(25);
}
}
int messageq_simple_init()
{
rt_mq_init(&mq, "mqt", &msg_pool[0], 128 - sizeof(void*), sizeof(msg_pool), RT_IPC_FLAG_FIFO);
/* 初始化消息队列 */
rt_mq_init(&mq, "mqt",
&msg_pool[0], /* 内存池指向msg_pool */
128 - sizeof(void*), /* 每个消息的大小是 128 - void* */
sizeof(msg_pool), /* 内存池的大小是msg_pool的大小 */
RT_IPC_FLAG_FIFO); /* 如果有多个线程等待，按照先来先得到的方法分配消息 */
/* 创建线程1 */
tid1 = rt_thread_create("t1",
@@ -116,7 +135,7 @@ static void _tc_cleanup()
if (tid3 != RT_NULL && tid3->stat != RT_THREAD_CLOSE)
rt_thread_delete(tid3);
/* 执行消息队列脱离 */
/* 执行消息队列对象脱离 */
rt_mq_detach(&mq);
/* 调度器解锁 */