DLL in D based on Tango

[Sean Kelly]

BLS wrote:
> Sean Kelly schrieb:
>> BLS wrote:
>>> Hello,
>>> My question is :
>>> Can I create a DLL written in *D* having a simple C Interface  *A* 
>>> scripting language can use ?
>>> Probabely yes.
>>>  Using TANGO ? I do not know.
>>
>> Tango has two routines for initializing and terminating the runtime:
>>
>> extern (C) bool  rt_init( void delegate( Exception ) dg = null );
>> extern (C) bool  rt_term( void delegate( Exception ) dg = null );
>>
>> Call these in DllMain or wherever appropriate.  The delegate will be 
>> passed any exceptions thrown while the functions are processing, and 
>> will return true/false on success/failure.
>>
>> As for the rest, building a DLL in Tango should be the same as doing 
>> so with Phobos.
>>
>>
>> Sean
> 
> Thank you Sean !
> Sean :
>  > Tango has two routines for initializing and terminating the runtime:
>  >
>  > extern (C) bool  rt_init( void delegate( Exception ) dg = null );
>  > Call these in DllMain or wherever appropriate.
> 
> leaves a lot of room for improvements, f.i.:
> 
> BOOL DllMain(HINSTANCE hInstance, ULONG ulReason, LPVOID pvReserved)
> {
>     switch (ulReason)
>     {
>     case DLL_PROCESS_ATTACH:
>         gc_init();            // initialize GC
> ............
>     case DLL_PROCESS_DETACH:
> ............
> Pretty sure it will make you shake your head - But I have to ask: Shall 
> I simply replace gc_init() with rt_init().

The D runtime includes a bunch of stuff, including the GC.  When you run 
a D app, the runtime is initialized before main() starts, and one of the 
things that happens is gc_init() is called.  Assuming you want 
DLL_PROCESS_ATTACH to be equivalent to 'starting' your DLL, then just 
replace gc_init() with rt_init().  rt_init() will call gc_init() as a 
part of its processing.

> I am sorry about beeing so uninformed:ignorant but I never really 
> understand the GC/Runtime Tango/Phobos problem.

No problem.  It's kind of tricky if you haven't spent time with that 
portion of the code.  That's one reason I decided to talk about the 
runtime at the D conference.


Sean