补充笔记、线程示例
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Day2/README.md
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Day2/README.md
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# Day 2
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## RTOS(实时系统)
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- 确定时间完成,对外部异步事件作出正确响应
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- 快、资源消耗少
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- 嵌入式系统通常使用RTOS
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- 多任务(线程)并发性
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裸机并发性(多任务同时)、实时性(快)差
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- 中断机制和多任务、优先级抢占和时间片轮转调度
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- [RT-Thread启动流程](https://www.rt-thread.org/document/site/#/rt-thread-version/rt-thread-standard/programming-manual/basic/basic?id=rt-thread-%e5%90%af%e5%8a%a8%e6%b5%81%e7%a8%8b)
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## 线程
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### 线程控制块
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存放线程信息的一个结构体
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[参考文档链接](https://www.rt-thread.org/document/site/#/rt-thread-version/rt-thread-standard/programming-manual/thread/thread?id=%e7%ba%bf%e7%a8%8b%e6%8e%a7%e5%88%b6%e5%9d%97)
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### 线程栈
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切换线程时,保存当前线程的上下文信息
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存放局部变量
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### 示例
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代码参考[]
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## 经验分享
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一个人忙不过来→多人协同→版本混乱、成果共享难……
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### 方法
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#### 软件开发管理
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- 版本控制 **用git**
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可本地离线使用、备份、版本与分支
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- 代码review(审核)
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- bug管理 -issue
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#### CI持续集成管理
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自动编译,报错,避免漏、错交
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#### 常见问题
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##### HardFault
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> lr可能存的是死前的线程地址
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- 栈内存写穿(数组越界)
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- 栈溢出(分配给线程的内存不够、函数调用太深)
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##### 解决方法-排除法
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> 两组环境,缩小差异,最终一致,找到问题
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#### 效率工具
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- Ulog 彩色
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- Utest
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> menuconfig 输入“/”可以搜索
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Day2/SConscript
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Day2/SConscript
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from building import *
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import os
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cwd = GetCurrentDir()
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src = Glob('*.c')
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CPPPATH = [cwd]
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if GetDepend(['PKG_USING_RTDUINO']) and not GetDepend(['RTDUINO_NO_SETUP_LOOP']):
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src += ['arduino_main.cpp']
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group = DefineGroup('Applications', src, depend = [''], CPPPATH = CPPPATH)
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list = os.listdir(cwd)
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for item in list:
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if os.path.isfile(os.path.join(cwd, item, 'SConscript')):
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group = group + SConscript(os.path.join(item, 'SConscript'))
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Return('group')
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Day2/day2thread.c
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Day2/day2thread.c
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#include<rtthread.h>
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#define THREAD_STACK_SIZE 512
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#define THREAD_PRIORITY 25
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#define THREAD_TIMESLICE 5
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static rt_thread_t tid1;
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static rt_thread_t tid1 =RT_NULL;
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static void thread1_entry(void *parameter)
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{
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int count = 0;
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while(1)
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{
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rt_kprintf("thread1 count:(%d) tick:%lu\n", count++,rt_tick_get());
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rt_thread_delay(500);
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}
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}
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static char thread2_stack[THREAD_STACK_SIZE*2];
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static struct rt_thread thread2;
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static void thread2_entry(void *parameter)
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{
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int count = 0;
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while(count<10)
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{
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rt_kprintf("thread2 count:(%d) tick:%lu\n", count++,rt_tick_get());
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rt_thread_delay(1000);
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}
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rt_kprintf("thread2 is exiting\n");
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}
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int thread(void)
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{
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tid1=rt_thread_create("thread1",
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thread1_entry,
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RT_NULL,
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THREAD_STACK_SIZE,
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THREAD_PRIORITY,
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THREAD_TIMESLICE);
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if(tid1!=RT_NULL)
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rt_thread_startup(tid1);
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rt_thread_init(&thread2,"thread2",thread2_entry,RT_NULL,thread2_stack,THREAD_STACK_SIZE,THREAD_PRIORITY-1,THREAD_TIMESLICE);
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rt_thread_startup(&thread2);
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return 0;
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}
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MSH_CMD_EXPORT(tgame, test thread game);
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Day2/image.png
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Day2/rtt_startup.png
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Day2/rtt_startup.png
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Day2/thread.png
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Day2/thread.png
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