Hi3861 OpenHarmony嵌入式应用入门--LiteOS Mutex

CMSIS 2.0接口中的Mutex（互斥锁）是用于在多线程环境中保护共享资源的访问机制。Mutex（互斥锁）是一种特殊的信号量，用于确保同一时间只有一个线程可以访问特定的共享资源。 在嵌入式系统或多线程应用中，当多个线程需要访问同一资源时，如果没有适当的同步机制，可能会导致数据不一致或其他问题。Mutex就是用来解决这类问题的。这些函数通常不能在中断服务程序（ISR）中调用，因为中断的上下文可能与这些函数的设计不符。 在使用Mutex时，必须确保正确地获取和释放锁，以避免死锁或其他同步问题。

Mutex API

代码编写

修改D:\DevEcoProjects\test\src\vendor\rtplay\rt_hi3861\demo\BUILD.gn文件

# Copyright (c) 2023 Beijing HuaQing YuanJian Education Technology Co., Ltd
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# 
#    http://www.apache.org/licenses/LICENSE-2.0
# 
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License. 
import("//build/lite/config/component/lite_component.gni")
lite_component("demo") {
  features = [
    #"base_00_helloworld:base_helloworld_example",
    #"base_01_led:base_led_example",
    #"base_02_loopkey:base_loopkey_example",
    #"base_03_irqkey:base_irqkey_example",
    #"base_04_adc:base_adc_example",
    #"base_05_pwm:base_pwm_example",
    #"base_06_ssd1306:base_ssd1306_example",
    #"kernel_01_task:kernel_task_example",
    #"kernel_02_timer:kernel_timer_example",
    #"kernel_03_event:kernel_event_example",
    "kernel_04_mutex:kernel_mutex_example",
  ]
}

创建D:\DevEcoProjects\test\src\vendor\rtplay\rt_hi3861\demo\kernel_04_mutex文件夹

文件夹中创建D:\DevEcoProjects\test\src\vendor\rtplay\rt_hi3861\demo\kernel_04_mutex\kernel_mutex_example.c文件D:\DevEcoProjects\test\src\vendor\rtplay\rt_hi3861\demo\kernel_04_mutex\BUILD.gn文件

# Copyright (c) 2023 Beijing HuaQing YuanJian Education Technology Co., Ltd
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# 
#    http://www.apache.org/licenses/LICENSE-2.0
# 
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License. 
static_library("kernel_mutex_example") {
    sources = [
        "kernel_mutex_example.c"
    ]
    include_dirs = [
        "//utils/native/lite/include",
        "//kernel/liteos_m/kal/cmsis",
    ]
}

/*
 * Copyright (c) 2023 Beijing HuaQing YuanJian Education Technology Co., Ltd
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#include 
#include 
#include "ohos_init.h"
#include "cmsis_os2.h"
osThreadId_t Task1_ID; //  任务1 ID
osThreadId_t Task2_ID; //  任务2 ID
osMutexId_t Mutex_ID;       // 定义互斥锁 ID
uint8_t buff[20] = {0};    // 定义一个共享资源
#define TASK_STACK_SIZE 1024
#define TASK_DELAY_TIME 1 // s
/**
 * @description: 任务1
 * @param {*}
 * @return {*}
 */
void Task1(void)
{
    int i = 0;
    printf("enter Task 1.......\n");
    while (1) {
        osMutexAcquire(Mutex_ID, osWaitForever);    // 请求互斥锁
        // 操作共享数据 写数据
        printf("write Buff Data: \n");
        for (i = 0; i  
使用build，编译成功后，使用upload进行烧录。