CODEWITHSUNDEEP
boostshared-ptrtr1c++03
Alexey Teplyakov
Alexey Teplyakov

Reputation: 316

Boost shared_ptr issue with TR1 libraries

class MyClass{
public:
  MyClass() {}
  virtual ~MyClass() {}
};

extern "C" int foo(int tryNumber)
{
    std::tr1::shared_ptr<MyClass> myClass(new MyClass());
    std::cout << "Object has been created " << tryNumber << << std::endl;
    return 0;
}

Then somewhere in my program I write:

for (int i = 0; i < 10000; ++i){
    foo(i);
}

There are the facts:

1) gcc 4.0.1, and I can't update them yet. So when I implement std::tr1::shared_ptr, I see the complier uses boost/shared_ptr.hpp (boost 1.33.1)

2) Well, the program uses many threads, I even don't know how they do work and what they do completely (the large project at my job), but I know, that I don't use any shared variables or something else that can cause this behavior

3) Sometimes it just prints:

Object has been created 0

Object has been created 1

...

Object has been created 9999

And everything is ok

Sometimes it prints 0-1-2-3-4 (or more) lines and then stops. Furthermore - I know, that the object has been created, but function hasn't returned the value and program just freezes, and when I try to attach to the program with gdb and type "where" - I see this:

0) 0xb7fd8430 in __kernel_vsyscall ()

1) 0xb7d9bece in _lll_mutex_lock-wait() from /lib/i686/libpthread.so.0

2) 0xb7d98500 in _L_mutex_lock_71 () from /lib/i686/libpthread.so.0

3) 0xbfbefab8 in ?? ()

4) 0x00000000 in ?? ()

Or this:

0) 0xb7fd8430 in __kernel_vsyscall ()

1) 0xb7d9bece in _lll_mutex_lock-wait() from /lib/i686/libpthread.so.0

2) 0xb7d98500 in _L_mutex_lock_71 () from /lib/i686/libpthread.so.0

..dunno what is here, I see only " .. in ?? ()"

10) .. in __gthread_mutex_lock

11) .. in __gthread_mutex_lock

12) .. in std::tr1::_Sp_counted_base::release

13) .. in ~shared_count

14) .. in ~shared_ptr

Seems it like shared_ptr is broken?

Upvotes: 1

Views: 112

Answers (1)

Alexey Teplyakov
Alexey Teplyakov

Reputation: 316

I just solved this issue. Changed this:

#include <tr1/memory> to #include <boost/shared_ptr.hpp>

std::tr1::shared_ptr to boost::shared_ptr

The solution is described here link

Upvotes: 1

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