http://d.puremagic.com/issues/show_bug.cgi?id=9900

           Summary: static this and gc shutdown order issue
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: druntime
        AssignedTo: nobody@puremagic.com
        ReportedBy: flamaros.xavier@gmail.com


--- Comment #0 from Xavier Bigand <flamaros.xavier@gmail.com> 2013-04-07 15:17:16 PDT ---
It seems gc is called after the main function to release all allocation, but only after all static this method were called.

I get a crash when my application is shutting down because Derelict library use static this methods to unload dynamic libraries, but I have to use some functions of those dynamic libraries to release their objects. I call libraries shutting down functions in classes destructors which are called after the dynamic libraries were unloaded.

Pseudo code :

// main.d
main()
{
   DerelictLua.load();    // Load lua library and affect all lua functions ptr

   LuaContext script = new LuaContext();

   return script.execute();
}

static ~this()
{
    DerelictLua.unload();    // Unload the liblua.so or dll, first
}

// luaContext.d
class LuaContext
{
    this()
    {
        mLuaContext = lua_newstate();
    }

    ~this()
    {
        lua_close(mLuaContext);    // Release the main lua library object,
second (lua_close is now a bad pointer)
    }

    Lua_State* mLuaContext;
}


I am expecting because the "script" variable isn't use out from the "main" function scope having no issue of this kind.

-- 
Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email
------- You are receiving this mail because: -------

http://d.puremagic.com/issues/show_bug.cgi?id=9900


Martin Nowak <code@dawg.eu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |code@dawg.eu


--- Comment #1 from Martin Nowak <code@dawg.eu> 2013-04-07 16:56:15 PDT ---
You must not use any shared library after unloading.
The simplest approach right now is to nullify any class from the shared library
and call GC.collect so that they get collected and finalized.

-- 
Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email
------- You are receiving this mail because: -------

http://d.puremagic.com/issues/show_bug.cgi?id=9900



--- Comment #2 from Xavier Bigand <flamaros.xavier@gmail.com> 2013-04-08 02:50:32 PDT ---
(In reply to comment #1)
> You must not use any shared library after unloading.
> The simplest approach right now is to nullify any class from the shared library
> and call GC.collect so that they get collected and finalized.

To fix it I add "delete script" before the "main" exit, but I thought druntime call gc.collect just after my main return.

Maybe I need to do like in java with hiding (or destroy(object)) objects I will
not use anymore?

-- 
Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email
------- You are receiving this mail because: -------

http://d.puremagic.com/issues/show_bug.cgi?id=9900



--- Comment #3 from Martin Nowak <code@dawg.eu> 2013-04-08 05:38:40 PDT ---
Yeah destroy finalizes your object and resets it's data to the init state. You'd have to check for a null mLuaContext in your destructor for this to work because the GC will finalize your object again.

-- 
Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email
------- You are receiving this mail because: -------

http://d.puremagic.com/issues/show_bug.cgi?id=9900


Martin Nowak <code@dawg.eu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |WONTFIX


--- Comment #4 from Martin Nowak <code@dawg.eu> 2013-04-08 05:40:15 PDT ---
> It seems gc is called after the main function to release all allocation, but
only after all static this method were called.

Because the module destructors may reference and use GC allocated memory.

-- 
Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email
------- You are receiving this mail because: -------