代码

//write
void write_file(const std::string file_name){FILE *fp = nullptr;fp = fopen(file_name.c_str(),"w+");fprintf(fp,"This is testing for mutex\n");fclose(fp);
}
//read
void read_file(const std::string file_name){std::ifstream fp(file_name,std::ios::binary);std::stringstream ss;ss << fp.rdbuf();std::cout << ss.str() << std::endl;fp.close();
}