设置全局区域设置时的内存泄漏 [英] Memory leak when setting global locale

问题描述

我使用此代码设置我的语言环境：

  locale :: global（locale（pt_BR.UTF-8 ））; 
  

我这样做是否正确？当我使用 Valgrind 运行代码时，它显示内存泄漏。我应该如何处理？
我应该重置旧的区域设置吗？

  376字节在1块仍然可以在损失记录65中73 
 == 7536 == at 0x4C2AB80：malloc（在/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so中）
 == 7536 == by 0x5380664：duplocale（duplocale.c：53）
 == 7536 == by 0x4EA436F：std :: ctype< wchar_t> :: ctype（__ locale_struct *，unsigned long）（在/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19）
 == 7536 == by 0x4EA86B3：std :: locale :: _ Impl :: _ Impl（char const *，unsigned long）（在/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19） 
 == 7536 == by 0x4EA8BDA：std :: locale :: locale（char const *）（在/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19）
 = = 7536 == by 0x40D68D：Relatorio :: geraRelatorios（）（Relatorio.cpp：23）
 == 7536 == by 0x402335：main（main.cpp：24）
 == 7536 == 
 == 7536 == 1个块中的376个字节在丢失记录中仍然可达73 
 == 7536 == at 0x4C2AB80：malloc（在/ usr / lib / valgrind / vgpreload_memcheck-amd64-linux中）。 so）
 == 7536 == by 0x5380664：duplocale（duplocale.c：53）
 == 7536 == by 0x4EA16DF：std :: codecvt< wchar_t，char，__mbstate_t> :: codecvt（__ locale_struct *，unsigned long）（在/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19）
 == 7536 == by 0x4EA86E1：std :: locale :: _ Impl :: _ Impl（char const *，unsigned long）（在/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19）
 == 7536 == by 0x4EA8BDA：std :: locale :: locale（char const * ）（在/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19）
 == 7536 == by 0x40D68D：Relatorio :: geraRelatorios（）（Relatorio.cpp：23）
 == 7536 == by 0x402335：main（main.cpp：24）
 == 7536 == 
 == 7536 == 1块中的376字节仍然可以在损失记录67中找到73 
 == 7536 == at 0x4C2AB80：malloc（在/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so中）
 == 7536 == by 0x5380664：duplocale（duplocale.c：53）
 == 7536 == by 0x4EA87D6：std :: locale :: _ Impl :: _ Impl（char const *，unsigned long）（在/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19） 
 == 7536 == by 0x4EA8BDA：std :: locale :: locale（char const *）（在/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19）
 = = 7536 == by 0x40D68D：Relatorio :: geraRelatorios（）（Relatorio.cpp：23）
 == 7536 == by 0x402335：main（main.cpp：24）
 == 7536 == 
 == 7536 == 1个块中的376个字节仍然可以在丢失记录中找到68 
 == 7536 == at 0x4C2AB80：malloc（在/ usr / lib / valgrind / vgpreload_memcheck-amd64-linux中）。所以）
 == 7536 == by 0x5380664：duplocale（duplocale.c：53）
 == 7536 == by 0x4EB1E8D：std :: __ timepunct< wchar_t> :: _ M_initialize_timepunct（__ locale_struct *） /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19）
 == 7536 == by 0x4ED6A27：std :: __ timepunct< wchar_t> :: __ timepunct（__ locale_struct *，char const *，unsigned long）（在/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19）
 == 7536 == by 0x4EA890C：std :: locale :: _ Impl :: _ Impl（char const *， unsigned long）（在/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19）
 == 7536 ==由0x4EA8BDA：std :: locale :: locale（char const *）（in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19）
 == 7536 == by 0x40D68D：Relatorio :: geraRelatorios（）（Relatorio.cpp：23）
 == 7536 == by 0x402335：main（main.cpp：24）
 == 7536 == 
 == 7536 == 1块中的376字节在丢失记录中仍然可见73 73 
 == 7536 == at 0x4C2AB80：malloc（在/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so中）
 == 7536 == by 0x5380664：duplocale（duplocale.c：53）
 == 7536 == by 0x4ED71E0：std :: messages< wchar_t> :: messages（__ locale_struct *，char const *，unsigned long）（在/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19） 
 == 7536 == by 0x4EA899F：std :: locale :: _ Impl :: _ Impl（char const *，unsigned long）（在/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19 ）
 == 7536 == by 0x4EA8BDA：std :: locale :: locale（char const *）（在/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19）
 == 7536 == by 0x40D68D：Relatorio :: geraRelatorios（）（Relatorio.cpp：23）
 == 7536 == by 0x402335：main（main.cpp：24）
 == 7536 == 
 == 7536 == 1个块中的400个字节在丢失记录中仍然可达73 
 == 7536 ==在0x4C2B0E0：operator new（unsigned long）（在/ usr / lib / valgrind / vgpreload_memcheck-amd64-linux.so）
 == 7536 == by 0x4EB1C29：std :: __ timepunct< char> :: _ M_initialize_timepunct（__ locale_struct *）（在/usr/lib/x86_64-linux-gnu/libstdc++.so .6.0.19）
 == 7536 == by 0x4EBBC47：std :: __ timepunct< char> :: __ timepunct（__ locale_struct *，char const *，unsigned long）（在/ usr / lib / x86_64-linux-gnu /libstdc++.so.6.0.19）
 == 7536 == by 0x4EA85F2：std :: locale :: _ Impl :: _ Impl（char const *，unsigned long）（在/ usr / lib / x86_64-linux- gnu / libstdc ++。so.6.0.19）
 == 7536 == by 0x4EA8BDA：std :: locale :: locale（char const *）（在/usr/lib/x86_64-linux-gnu/libstdc++.so .6.0.19）
 == 7536 == by 0x40D68D：Relatorio :: geraRelatorios（）（Relatorio.cpp：23）
 == 7536 == by 0x402335：main（main.cpp：24） 
 == 7536 == 
 == 7536 == 1个块中的400个字节在丢失记录71中仍然可达73 
 == 7536 == at 0x4C2B0E0：operator new（unsigned long） （在/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so）
 == 7536 == by 0x4EB25A9：std :: __ timepunct< wchar_t> :: _ M_initialize_timepunct（__ locale_struct *）（在/ usr / lib / x86_64-linux-gnu / libstdc ++。so.6.0.19）
 == 7536 == by 0x4ED6A27：std :: __ timepunct< wchar_t> :: __ timepunct（__ locale_struct *，char const *，unsigned long） usr / lib / x86_64-linux-gnu / libstdc ++。so.6.0.19）
 == 7536 == by 0x4EA890C：std :: locale :: _ Impl :: _ Impl（char const *，unsigned long） /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19）
 == 7536 == by 0x4EA8BDA：std :: locale :: locale（char const *）（在/ usr / lib / x86_64-linux-gnu / libstdc ++。so.6.0.19）
 == 7536 == by 0x40D68D：Relatorio :: geraRelatorios（）（Relatorio.cpp：23）
 == 7536 == by 0x402335 ：main（main.cpp：24）
 == 7536 == 
 == 7536 == 1块中的576字节在丢失记录中仍然可达72 73 
 == 7536 ==在0x4C2B0E0：operator new（unsigned long）（在/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so中）
 == 7536 == by 0x4EA8384：std :: locale :: _ Impl :: _ Impl（char const *，unsigned long）（在/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19）
 == 7536 == by 0x4EA8BDA：std :: locale :: locale（char const * ）（在/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19）
 == 7536 == by 0x40D68D：Relatorio :: geraRelatorios（）（Relatorio.cpp：23）
 == 7536 == by 0x402335：main（main.cpp：24）
 == 7536 == 
 == 7536 == 1块中的1,344字节仍然可在损失记录73中到达73 
 == 7536 == at 0x4C2B0E0：operator new（unsigned long）（在/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so中）
 == 7536 == by 0x4EA86A1：std :: locale :: _ Impl :: _ Impl（char const *，unsigned long）（在/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19）
 == 7536 == by 0x4EA8BDA：std :: locale :: locale（char const *）（在/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19）
 == 7536 == by 0x40D68D：Relatorio :: geraRelatorios（）（Relatorio .cpp：23）
 == 7536 == by 0x402335：main（main.cpp：24）
  

$ b b

我只是调用locale一次，给我一百个内存泄漏。

谢谢。

在gcc（v5.3.0）的源代码中，构造函数locale :: locale（在libstdc ++ - v3 / src / c ++ 98 / localename.cc）使用 new _Impl（...）或（_ M_impl = _S_classic） > _M_add_reference（）; 。而destructor（在locale.cc）调用 _M_remove_reference 减少ref计数器。所以我不知道为什么会有内存泄漏。

读了locale :: locale的构造函数后，我发现了一个诀窍。离开应用程序时，调用 locale :: global（locale（C））; 。使用 locale（C）不要在构造函数中使用新的_M_add_reference。因此，以前的语言环境（ locale（pt_BR.UTF-8）将被销毁，新的语言环境将不会通过分配创建。

I am using this code to set my locale:

locale::global(locale("pt_BR.UTF-8"));

Am I doing this correctly ? When I run the code with Valgrind, it is displaying memory leak. How should I handle with ? Should I reset the old locale ?

376 bytes in 1 blocks are still reachable in loss record 65 of 73
==7536==    at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==7536==    by 0x5380664: duplocale (duplocale.c:53)
==7536==    by 0x4EA436F: std::ctype<wchar_t>::ctype(__locale_struct*, unsigned long) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==7536==    by 0x4EA86B3: std::locale::_Impl::_Impl(char const*, unsigned long) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==7536==    by 0x4EA8BDA: std::locale::locale(char const*) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==7536==    by 0x40D68D: Relatorio::geraRelatorios() (Relatorio.cpp:23)
==7536==    by 0x402335: main (main.cpp:24)
==7536== 
==7536== 376 bytes in 1 blocks are still reachable in loss record 66 of 73
==7536==    at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==7536==    by 0x5380664: duplocale (duplocale.c:53)
==7536==    by 0x4EA16DF: std::codecvt<wchar_t, char, __mbstate_t>::codecvt(__locale_struct*, unsigned long) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==7536==    by 0x4EA86E1: std::locale::_Impl::_Impl(char const*, unsigned long) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==7536==    by 0x4EA8BDA: std::locale::locale(char const*) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==7536==    by 0x40D68D: Relatorio::geraRelatorios() (Relatorio.cpp:23)
==7536==    by 0x402335: main (main.cpp:24)
==7536== 
==7536== 376 bytes in 1 blocks are still reachable in loss record 67 of 73
==7536==    at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==7536==    by 0x5380664: duplocale (duplocale.c:53)
==7536==    by 0x4EA87D6: std::locale::_Impl::_Impl(char const*, unsigned long) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==7536==    by 0x4EA8BDA: std::locale::locale(char const*) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==7536==    by 0x40D68D: Relatorio::geraRelatorios() (Relatorio.cpp:23)
==7536==    by 0x402335: main (main.cpp:24)
==7536== 
==7536== 376 bytes in 1 blocks are still reachable in loss record 68 of 73
==7536==    at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==7536==    by 0x5380664: duplocale (duplocale.c:53)
==7536==    by 0x4EB1E8D: std::__timepunct<wchar_t>::_M_initialize_timepunct(__locale_struct*) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==7536==    by 0x4ED6A27: std::__timepunct<wchar_t>::__timepunct(__locale_struct*, char const*, unsigned long) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==7536==    by 0x4EA890C: std::locale::_Impl::_Impl(char const*, unsigned long) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==7536==    by 0x4EA8BDA: std::locale::locale(char const*) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==7536==    by 0x40D68D: Relatorio::geraRelatorios() (Relatorio.cpp:23)
==7536==    by 0x402335: main (main.cpp:24)
==7536== 
==7536== 376 bytes in 1 blocks are still reachable in loss record 69 of 73
==7536==    at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==7536==    by 0x5380664: duplocale (duplocale.c:53)
==7536==    by 0x4ED71E0: std::messages<wchar_t>::messages(__locale_struct*, char const*, unsigned long) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==7536==    by 0x4EA899F: std::locale::_Impl::_Impl(char const*, unsigned long) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==7536==    by 0x4EA8BDA: std::locale::locale(char const*) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==7536==    by 0x40D68D: Relatorio::geraRelatorios() (Relatorio.cpp:23)
==7536==    by 0x402335: main (main.cpp:24)
==7536== 
==7536== 400 bytes in 1 blocks are still reachable in loss record 70 of 73
==7536==    at 0x4C2B0E0: operator new(unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==7536==    by 0x4EB1C29: std::__timepunct<char>::_M_initialize_timepunct(__locale_struct*) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==7536==    by 0x4EBBC47: std::__timepunct<char>::__timepunct(__locale_struct*, char const*, unsigned long) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==7536==    by 0x4EA85F2: std::locale::_Impl::_Impl(char const*, unsigned long) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==7536==    by 0x4EA8BDA: std::locale::locale(char const*) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==7536==    by 0x40D68D: Relatorio::geraRelatorios() (Relatorio.cpp:23)
==7536==    by 0x402335: main (main.cpp:24)
==7536== 
==7536== 400 bytes in 1 blocks are still reachable in loss record 71 of 73
==7536==    at 0x4C2B0E0: operator new(unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==7536==    by 0x4EB25A9: std::__timepunct<wchar_t>::_M_initialize_timepunct(__locale_struct*) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==7536==    by 0x4ED6A27: std::__timepunct<wchar_t>::__timepunct(__locale_struct*, char const*, unsigned long) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==7536==    by 0x4EA890C: std::locale::_Impl::_Impl(char const*, unsigned long) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==7536==    by 0x4EA8BDA: std::locale::locale(char const*) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==7536==    by 0x40D68D: Relatorio::geraRelatorios() (Relatorio.cpp:23)
==7536==    by 0x402335: main (main.cpp:24)
==7536== 
==7536== 576 bytes in 1 blocks are still reachable in loss record 72 of 73
==7536==    at 0x4C2B0E0: operator new(unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==7536==    by 0x4EA8384: std::locale::_Impl::_Impl(char const*, unsigned long) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==7536==    by 0x4EA8BDA: std::locale::locale(char const*) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==7536==    by 0x40D68D: Relatorio::geraRelatorios() (Relatorio.cpp:23)
==7536==    by 0x402335: main (main.cpp:24)
==7536== 
==7536== 1,344 bytes in 1 blocks are still reachable in loss record 73 of 73
==7536==    at 0x4C2B0E0: operator new(unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==7536==    by 0x4EA86A1: std::locale::_Impl::_Impl(char const*, unsigned long) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==7536==    by 0x4EA8BDA: std::locale::locale(char const*) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==7536==    by 0x40D68D: Relatorio::geraRelatorios() (Relatorio.cpp:23)
==7536==    by 0x402335: main (main.cpp:24)

I just call the locale once, and gives me a hundred of memory leak.

Thanks.

解决方案

I have the same problem.

In the source code of gcc (v5.3.0), the constructor locale::locale (in libstdc++-v3/src/c++98/localename.cc) uses new _Impl (…) or (_M_impl = _S_classic)->_M_add_reference();. And the destructor (in locale.cc) call _M_remove_reference that decrease the ref counter. So I don't know why there is a memory leak.

After reading the constructor of locale::locale, I found a trick. On leaving your application, call locale::global(locale("C"));. Using locale("C") do not use a new in constructor but a _M_add_reference. So the previous locale (locale("pt_BR.UTF-8") will be destroyed and the new locale will not be created by allocation.

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