---
title: 安全函数过滤使用场景
description: "用户可以通过在内存一致性动态检查命令devkit advisor dr-check之后，添加“-s/--safe-file”参数的方式，实现在内存一致性动态检查期间不检查相关的安全函数。"
url: https://www.hikunpeng.com/document/detail/zh/kunpengdevps/development/affinityanalyzer/KunpengDevKitCli_0095.html
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indexId: d308008b054cd4c024d6d1b793b3df30ef3be817c926c419f514ef0aa0879e0379
---
# 安全函数过滤使用场景

用户可以通过在内存一致性动态检查命令devkit advisor dr-check之后，添加“-s/--safe-file”参数的方式，实现在内存一致性动态检查期间不检查相关的安全函数。

添加“-s/--safe-file”参数需指定CFG配置文件，文件中写入需要过滤安全函数的名称。若为cpp文件，必须写入安全函数经过名称修饰后的符号名。

#### 安全函数过滤使用示例

本示例通过指定安全函数过滤CFG配置文件，执行内存一致性动态检查后实现安全函数过滤操作。

1. 编译源码文件，生成可执行二进制文件。此处以自定义类添加锁为例，请根据实际情况在“-s”指定的配置文件中添加安全函数。
  1 g++ test.cpp -o test -g -lpthread

  “test.cpp”文件内容如下： 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 #include <atomic> #include <iostream> #include <pthread.h> class my_custom_spinlock{ std::atomic_flag is_locked ={false}; public: void lock(){ while (is_locked.test_and_set(std::memory_order_acquire)){} } void unlock (){ is_locked.clear (std::memory_order_release); } }; int data_race = 0; my_custom_spinlock spinlock; void* first_thread(void* arg){ spinlock.lock(); data_race = 5; spinlock.unlock(); return 0; } void* second_thread(void* arg){ spinlock.lock(); data_race = 3; spinlock.unlock(); return 0; } int main(int argc, char *argv[]) { pthread_t thr1, thr2; pthread_create(&thr1, NULL, first_thread, NULL); pthread_create(&thr2, NULL, second_thread, NULL); pthread_join(thr1, NULL); pthread_join(thr2, NULL); for(int i = 1; i <argc; ++i){ std::cout<< argv[i] << std::endl; } std::cout<< data_race << std::endl; return 0; }

2. 执行内存一致性动态检查。“/home/advisor/test”为ELF文件路径，请根据实际情况进行修改。

```
devkit advisor dr-check -f
/home/advisor/test
```


  返回信息如下，从返回信息中的加粗信息可以看出有2行代码推荐修改。

```
Executing dynamic memory consistency check task, please wait...
The pid of the memtracer process is 1362149
Scanned time: 2025/05/10 03:06:15
Configuration:
ELF filepath: /home/advisor/test
Scan source code path: /home/testcase/project
Generate report path: /home/DevKit_Software
Generate report type: all
Task Timeout Interval: The timeout period is not set.
Log level: info
Summary:
There are 2 recommended code lines to modify.
For the detailed information on multi-thread races, please check:
/home/DevKit_Software/dr-check_test_20250510030615_554d.json
/home/DevKit_Software/dr-check_test_20250510030615_554d.html
/home/DevKit_Software/dr-check_test_20250510030615_554d.csv
```


3. 通过nm命令可查看test文件中first_thread和second_thread函数经过名称修饰后的符号名。
  1 nm test

  回显信息如下：

  1 2 0000000000400a84 T _Z12first_threadPv 0000000000400ac4 T _Z13second_threadPv

4. 创建配置文件safe_functions.cfg，写入内容。
  1 2 _Z12first_threadPv _Z13second_threadPv

5. 再次执行内存一致性动态检查。

```
devkit advisor dr-check -f
/home/advisor/test
-s
/home/testcase/safe_functions.cfg
```


  “/home/testcase/safe_functions.cfg”：CFG配置文件，指定在内存一致性动态检查中不进行检查的安全函数，请根据实际情况进行修改。

  返回信息如下，从返回信息中的加粗信息可以看出无代码行需要修改，实现安全函数过滤操作。

```
Executing dynamic memory consistency check task, please wait...
The pid of the memtracer process is 1362149
Scanned time: 2025/05/10 03:15:15
Configuration:
ELF filepath: /home/advisor/test
Scan source code path: /home/testcase/project
Generate report path: /home/DevKit_Software
Generate report type: all
Task Timeout Interval: The timeout period is not set.
Log level: info
Summary:
There are 0 recommended code lines to modify.
For the details information on multi-thread races, please check:
/home/DevKit_Software/dr-check_test_20250510031515_663d.json
/home/DevKit_Software/dr-check_test_20250510031515_663d.html
/home/DevKit_Software/dr-check_test_20250510031515_663d.csv
```