Can anybody explain why this code crash (memory allocation in shared library)? Try to run test_dll_exe.exe several times:
----
// test_dll.d
import std.stdio;
import core.sys.windows.windows;
import core.sys.windows.dll;

mixin SimpleDllMain;

extern(C) {

export void TestFun() {
    double[int] T;
    foreach (i; 0..10_000_000) {
        writefln("i:%d",i);
        T[i] = i*1.0;
    }
}

}
----
// test_dll_exe.d
import core.runtime;
import core.sys.windows.windows;
import std.exception;

void main() {
    HMODULE test_dll = cast(HMODULE) enforce(Runtime.loadLibrary("test_dll.dll"));

    alias extern(C) void function() Test_type;
    Test_type TestFun = cast(Test_type) enforce(GetProcAddress(test_dll, "TestFun"));
    TestFun();
}
----
Problem reproduces with dmd 2.095.0 and ldc2 1.24 on Windows 7 SP1, Intel i7 4790.
Compile options:
dmd -m64 -shared -oftest_dll.dll -L/DLL test_dll.d dll.d
dmd -m64 test_dll_exe.d

or

ldc2.exe --m64 --shared --of=test_dll.dll -L=/DLL test_dll.d
ldc2.exe --m64 test_dll_exe.d

Any ideas? How to allocate memory in shared library properly?

On Monday, 25 January 2021 at 15:32:40 UTC, Vitalii wrote:
> Can anybody explain why this code crash (memory allocation in shared library)? Try to run test_dll_exe.exe several times:

I ran it once, successfully. Maybe a hardware issue? I will give it a few more tries later.

-- Bastiaan.

On Monday, 25 January 2021 at 22:17:01 UTC, Bastiaan Veelo wrote:
> On Monday, 25 January 2021 at 15:32:40 UTC, Vitalii wrote:
>> Can anybody explain why this code crash (memory allocation in shared library)? Try to run test_dll_exe.exe several times:
>
> I ran it once, successfully. Maybe a hardware issue? I will give it a few more tries later.
>
> -- Bastiaan.

Tried it six times now, works fine every time. DMD32 D Compiler v2.094.1-dirty.

-- Bastiaan.

On Monday, 25 January 2021 at 15:32:40 UTC, Vitalii wrote:
> Can anybody explain why this code crash (memory allocation in shared library)? Try to run test_dll_exe.exe several times:
> ----
> // test_dll.d
> import std.stdio;
> import core.sys.windows.windows;
> import core.sys.windows.dll;
>
> mixin SimpleDllMain;
>
> extern(C) {
>
> export void TestFun() {
>     double[int] T;
>     foreach (i; 0..10_000_000) {
>         writefln("i:%d",i);
>         T[i] = i*1.0;
>     }
> }
>
>
> Any ideas? How to allocate memory in shared library properly?

You did not initialize the D runtime in your shared library.
  - call Runtime.initialize()/Runtime.deinitialize() with this pragma: https://wiki.dlang.org/LDC-specific_language_changes#LDC_global_crt_ctor_and_LDC_global_crt_dtor (or have separate callbacks for this)
  - attach incoming threads, and detach exiting threads as they enter/exit your callback