C ++的std :: string池，调试构建？ std :: string和valgrind的问题 [英] C++'s std::string pools, debug builds? std::string and valgrind problems

问题描述

我有一个问题，许多valgrind警告可能的内存泄漏std :: string，像这样：

  120 4个块中的字节可能在丢失记录中丢失4,192 
 $ 0x4A06819：operator new（unsigned long）（vg_replace_malloc.c：230）
由0x383B89B8B0：std :: string :: _ Rep :: _ S_create （unsigned long，unsigned long，std :: allocator< char> const&）（在/usr/lib64/libstdc++.so.6.0.8中）
 by 0x383B89C3B4：（在/usr/lib64/libstdc++.so。 6.0.8）
 by 0x383B89C4A9：std :: basic_string< char，std :: char_traits< char>，std :: allocator< char> > :: basic_string（char const *，unsigned long，std :: allocator< char> const&）（在/usr/lib64/libstdc++.so.6.0.8中）
  / pre> 
 
 
我想知道：
 
 
 
 
 
 does std :: string 
 
 
如果是这样，是否有任何方式禁用池（以调试版本等形式）？
 
 
 
 
解决方案
检查常见问题。有一个关于容器中的内存泄漏的部分。您应该
 
 
 
 
 
检查您的Valgrind版本
 
 
使用您的程序的调试版本 - 优化）
 
 
并在必要时定义 GLIBCXX_FORCE_NEW 。 （这是影响程序运行时行为的环境变量，而不是您可能期望的编译时 #define 。）
 
 
 
I have a problem with many valgrind warnings about possible memory leaks in std::string, like this one:
120 bytes in 4 blocks are possibly lost in loss record 4,192 of 4,687
    at 0x4A06819: operator new(unsigned long) (vg_replace_malloc.c:230)
    by 0x383B89B8B0: std::string::_Rep::_S_create(unsigned long, unsigned long, std::allocator<char> const&) (in /usr/lib64/libstdc++.so.6.0.8)
    by 0x383B89C3B4: (within /usr/lib64/libstdc++.so.6.0.8)
    by 0x383B89C4A9: std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, unsigned long, std::allocator<char> const&) (in /usr/lib64/libstdc++.so.6.0.8)
I'm wondering:


does std::string (GCC 4.1.2) use any memory pools?
if so, is there any way to disable the pools (in form of a debug build etc.)?

解决方案
Check the FAQ. There is a section about "Memory leaks" in containers. You should


check your version of Valgrind
use a debug build of your program (and un-optimized)
and define GLIBCXX_FORCE_NEW if necessary.  (This is an environment variable that affects your program's runtime behavior, not a compile-time #define as you might expect.)


                        
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