So I tested it on my side with following code:
t.dll:
__thread int g_var = 1;
__declspec(dllexport) int get_g_var (void)
{
return g_var;
}
__declspec(dllexport) void set_g_var (int v)
{
g_var = v;
}
and t2.exe:
#include <windows.h>
#include <stdio.h>
typedef int (*f1)(void);
typedef void (*f2)(int);
int main()
{
HINSTANCE h = LoadLibrary ("t.dll");
f1 get;
f2 set;
if (!h)
{ printf ("Failed to load t.dll\n"); return 0; }
get = (f1) GetProcAddress (h, "get_g_var");
set = (f2) GetProcAddress (h, "set_g_var");
if (!get || !set)
{ printf ("Imports not present in t.dll\n"); return 0; }
printf ("g_var = %d\n", (*get) ());
(*set)(2);
printf ("g_var = %d\n", (*get) ());
FreeLibrary (h);
return 0;
}
It works for mingw-w64 for 32-bit and 64-bit. I assume the code in
question for this is in crtdllt.c:
...
if (__dyn_tls_init_callback != NULL)
{
__dyn_tls_init_callback (hDllHandle, DLL_THREAD_ATTACH, lpreserved);
}
..
As far as I see is mingw.org not synchronizing with loading of
msvcrt.dll, so code is here quite different to that what happens in
mingw-w64.
Regards,
Kai
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