Problem with static STL i.e. map

This is a discussion on Problem with static STL i.e. map within the C++ Programming forums, part of the General Programming Boards category; I am getting coredump on linux (Red Hat 3.4.6-8). I am using gcc (GCC) 3.4.6 20060404 compiler. The problem is ...

  1. #1
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    Problem with static STL i.e. map

    I am getting coredump on linux (Red Hat 3.4.6-8).
    I am using gcc (GCC) 3.4.6 20060404 compiler.

    The problem is I have used a static map inside a function (making the map local to the function). This function is in libStreet.so Now at run time another host application is loading this libStreet.so , using it and then unloading it.Everything works fine,But when host application closes[i.e. exits] It is giving coredump.If I change static map to static vector then it works fine[no coredump while closing host application.].

    I know that the static variables get deallocated after exiting from main() of host application, please let me know if my understanding is correct.

    In my case host application crashes after exiting main, however replacing the map with a vector solves the problem. Can anyone please help on this issue, Thanks.

    Please note that the same code works fine on Sun Solaris, gcc (GCC) 3.4.3 (csl-sol210-3_4-branch+sol_rpath) version

  2. #2
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    deallocation of static STL

    My questions are,

    1.Exactly when static variables in libStreet.so gets deallocated[After unloading libStreet.so or after exiting from main() of host apllication].
    2.STL grows at runtime if needed and variables marked as static gets space in .obj at compile time i.e. fixed amount of space[not absolute memory location but the offset].Then how does compiler handles allocation and deallocation of variables of type static STL[i.e. static map,vector,..].
    3.In our case host application crashes after exiting main[after unloading libStreet.so].It means static map is getting destructed after exiting main.It conflicts with 2nd point[allocation of space for static variable in .obj]
    4.Also if static variables which are from libStreet.so are getting destructed after exiting main() of host application and libStreet.so is already unloaded then how does host application gets access of the destructors of static type which are declared in libStreet.so .

    Could anybody please help on this issue,Thanks in advance.
    Last edited by laserlight; 10-26-2007 at 03:07 AM. Reason: Merged duplicate threads.

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    http://www.dwheeler.com/program-libr...libraries.html
    Pay attention to the "Instead, libraries should export routines using the __attribute__((constructor)) and __attribute__((destructor)) function attributes" information.
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