valgrind 发现的内存泄漏问题,请人帮解一下

zhuhuaitao226

1. int main()
   
2. {  
   
3.         //sigset_t sign;
   
4.         //sigemptyset(&sign);
   
5.         //sigaddset(&sign, SIGINT);
   
6.         //sigprocmask(SIG_SETMASK,&sign,NULL);
   
7.         //struct sigaction siga;
   
8.         //siga.sa_handler = SIG_DFL;
   
9.         //siga.sa_mask = sign;
   
10.         //siga.sa_flags = SA_ONESHOT|SA_NOMASK;
    
11.         //siga.sa_restorer = NULL;
    
12.         //sigaction(SIGINT, &siga, NULL);
    
13. 
    
14.         //Timer::initTimer();
    
15.         trace tr;
    
16.         trace2 tr2;
    
17.         //Timer::getSingletionPtr()->setTimer(1,SubscriberHelper(&tr, &trace::output),5);
    
18.         //Timer::getSingletionPtr()->setTimer(2,SubscriberHelper(&tr2, &trace2::output2),1);
    
19.         //sleep(10);
    
20.         //Timer::releaseTimer();
    
21.         std::map<int,int> mymap;
    
22.         mymap.insert(std::make_pair(3,3));
    
23.         mymap.clear();
    
24.         return 0;
    
25. }

复制代码

代码如上, 用valgrind 做内存泄漏测试时如果如下
valgrind --tool=memcheck --leak-check=full  --show-reachable=yes ./testApp

==20974== 960 bytes in 1 blocks are still reachable in loss record 1 of 1
==20974==    at 0x4004790: operator new(unsigned) (vg_replace_malloc.c:164)
==20974==    by 0x40E9BA0: std::__default_alloc_template<true, 0>::_S_chunk_alloc(unsigned, int& (in /usr/lib/libstdc++.so.5.0.7)
==20974==    by 0x40E9AAC: std::__default_alloc_template<true, 0>::_S_refill(unsigned) (in /usr/lib/libstdc++.so.5.0.7)
==20974==    by 0x40E9687: std::__default_alloc_template<true, 0>::allocate(unsigned) (in /usr/lib/libstdc++.so.5.0.7)
==20974==    by 0x804931B: std::__simple_alloc<std::_Rb_tree_node<std::pair<int const, int> >, std::__default_alloc_template<true, 0> >::allocate(unsigned) (stl_alloc.h:23
==20974==    by 0x80491EF: std::_Rb_tree_alloc_base<std::pair<int const, int>, std::allocator<std::pair<int const, int> >, true>::_M_get_node() (stl_tree.h:564)
==20974==    by 0x8048E01: std::_Rb_tree_base<std::pair<int const, int>, std::allocator<std::pair<int const, int> > >::_Rb_tree_base(std::allocator<std::pair<int const, int> > const& (stl_tree.h:579)
==20974==    by 0x8048B1C: std::_Rb_tree<int, std::pair<int const, int>, std::_Select1st<std::pair<int const, int> >, std::less<int>, std::allocator<std::pair<int const, int> > >::_Rb_tree(std::less<int> const&, std::allocator<std::pair<int const, int> > const& (stl_tree.h:730)
==20974==    by 0x8048A3E: std::map<int, int, std::less<int>, std::allocator<std::pair<int const, int> > >::map() (stl_map.h:124)
==20974==    by 0x8048988: main (main.cpp:52)
==20974==
==20974== LEAK SUMMARY:
==20974==    definitely lost: 0 bytes in 0 blocks.
==20974==      possibly lost: 0 bytes in 0 blocks.
==20974==    still reachable: 960 bytes in 1 blocks.
==20974==         suppressed: 0 bytes in 0 blocks.

这里的 still reachable 的960字节是代表泄漏吗?

飞雪横天

那个960字节不是内存泄漏，这是由C++统一管理的。

zhuhuaitao226

哦, 谢谢.