Simply linking my D shared library with foreign code (Python with the help of ctypes in this case) does not work. What function should I call? What about 'shared static ~this()'? And would the answer be different for 'static this()' etc.?

Thank you,
Ali

Did you already try rt_init? That should trigger it....

On Saturday, 18 January 2020 at 03:53:43 UTC, Adam D. Ruppe wrote:
> Did you already try rt_init? That should trigger it....

Indeed, this is done by runtime initialization.

btw there is also a `pragma(crt_constructor)` thing you can put on individual functions for pure C runtime init things.

On 1/18/20 6:14 AM, Guillaume Piolat wrote:
> On Saturday, 18 January 2020 at 03:53:43 UTC, Adam D. Ruppe wrote:
>> Did you already try rt_init? That should trigger it....
> 
> Indeed, this is done by runtime initialization.

Thank you, Adam and Guillaume. That tells me I've been using druntime without initializing it. :D I'm guessing the problem would be the lack of garbage collection? Otherwise, dynamic arrays seemed to work correctly (so far).

Ali

Aside: A tip for others who may need to call the Python C API from D, you have to call PyGILState_Ensure() and PyGILState_Release(): https://docs.python.org/3/c-api/init.html#non-python-created-threads

On 1/17/20 7:53 PM, Adam D. Ruppe wrote:
> Did you already try rt_init? That should trigger it....

I was under the impression that the extern (C) function rt_init() would magically be exposed from the library but 'nm' showed no such symbol. So, I ended up exposing a my_init() function, which called rt_init() internally.

I've realized that rt_init() is sneaky: it returns 1 for success. WAT!? :p Then I discovered the more readable Runtime.initialize(), which is also sneaky by returning 'true' for success. WAT!? WAT!? :p

This worked:

import core.runtime;

extern (C)
int my_init() {
  return tried({
    return Runtime.initialize ? 0 : 1;
  });
}

my_deinit() is similar...

Ali

P.S.'tried' is a function template that I wrote, which catches all throwables, logs the issue, and returns 1 as an error code.