Databases
StackOverflow2013
Postsdbo
POStatic Class Variables in Dynamic Library and Main Program
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POStatic Class Variables in Dynamic Library and Main Program
    primarykey
    data
    text
    <p>I am working on a project that has a class 'A' that contains a static stl container class. This class is included in both my main program and a .so file. The class uses the default(implicit, not declared) constructor/destructor. The main program loads the .so file using dlopen() and in its destructor, calls dlclose(). The program crashes after main exits when glibc calls the destructor for the static class member variable. The problem appears to be that when dlclose() is called, the destructor for the static variable is called, then when main exits() glibc also calls the destructor, resulting in a double free.</p> <p>I have 2 questions, namely:<br> 1) In this particular case, why are there not two copies of the static variable(yes i know that sounds somewhat ridiculous, but since both the main program and .so file have a separately compiled 'A', shouldn't they each have one?)<br> 2) Is there any way to resolve this issue without re-writing class 'A' to not contain static member variables?</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USPaul
    plurals
    1. PL
      singulars
      1. LTLinked
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POStatic Class Variables in Dynamic Library and Main Program
      1. USDmitry Yudakov
      1. VTFavorite
    2. VO
      singulars
      1. POStatic Class Variables in Dynamic Library and Main Program
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POStatic Class Variables in Dynamic Library and Main Program
      1. This table or related slice is empty.
      1. VTUpMod
    1. COIs the destructor for the static called from within `dlclose()`? I ran into a similar problem but the code segment was unmapped before the destructor for the static was called.
      singulars
      1. POStatic Class Variables in Dynamic Library and Main Program
      1. USD.Shawley
    2. COYou have misdiagnosed the problem - shared libraries get their own static variables.
      singulars
      1. POStatic Class Variables in Dynamic Library and Main Program
      1. This table or related slice is empty.
    3. COYes, they do, and when i looked at the symbol table, the shared library does have its own symbol. However it appears as if the symbol for the .SO is never used. The static constructor and destructor is called twice for the symbol inside the main program. Can this be a result of some bad name mangling as a result of extern "C" function declarations?
      singulars
      1. POStatic Class Variables in Dynamic Library and Main Program
      1. USPaul
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload