Hi all,
I have a plugin that uses libsecret, and thus glib, on Linux. (It is a
package for R.)
It is loaded with dlopen(), and it (ideally) can be unloaded with
dlclose(). I use the synchronous libsecret functions, which AFAICT run a
temporary glib event loop for each libsecret query. E.g. this is what I am
doing:
GError *err = NULL;
gchar *password = secret_password_lookup_sync (
keyring_secret_service_schema(),
/* cancellable = */ NULL,
&err,
"service", cservice,
"username", cusername,
NULL);
if (err) {
if (password) secret_password_free(password);
keyring_secret_service_handle_status("get", TRUE, err);
}
if (!password) {
error("keyring item not found");
return R_NilValue;
} else {
secret_password_free(password);
/* ... */
return result;
}
When the lib is unloaded I call secret_service_disconnect(), I checked that
this is called. I do link to libgobject-2.0, I even call g_type_ensure
(G_TYPE_OBJECT) to make sure that the constructors in libgobject run.
However, it seems that the worker threads for glib (?) are never cleaned
up. Even if I dlclose() the lib, they are there. What am I missing here? Do
I have to eliminate the threads manually? If yes, how can I do that?
An even bigger problem is, that if I dlopen() the same plugin again, and
call a libsecret function, then it just freezes with this:
(process:18663): GLib-GObject-WARNING **: cannot register existing type
'SecretService'
(process:18663): GLib-GObject-CRITICAL **: g_type_add_interface_static:
assertion 'G_TYPE_IS_INSTANTIATABLE (instance_type)' failed
(process:18663): GLib-GObject-CRITICAL **: g_type_add_interface_static:
assertion 'G_TYPE_IS_INSTANTIATABLE (instance_type)' failed
(process:18663): GLib-CRITICAL **: g_once_init_leave: assertion 'result !=
0' failed
(process:18663): GLib-GIO-CRITICAL **: g_async_initable_new_valist_async:
assertion 'G_TYPE_IS_ASYNC_INITABLE (object_type)' failed
Which seems to suggest that I need to unregister the SecretService type at
dlclose(). Is that right? How can I do that?
I don't have too much experience with glib, and I am just probably doing
something wrong, or missing something. Any help is appreciated. I can also
put together a reproducible example if needed.
Thanks, Best,
Gabor
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