• Vitalii (40/40) Jan 25 2021 Can anybody explain why this code crash (memory allocation in
• Bastiaan Veelo (4/6) Jan 25 2021 I ran it once, successfully. Maybe a hardware issue? I will give
• Bastiaan Veelo (4/10) Jan 26 2021 Tried it six times now, works fine every time. DMD32 D Compiler
• Guillaume Piolat (7/24) Jan 27 2021 You did not initialize the D runtime in your shared library.

Vitalii <yvitaliy1980 yandex.ru> writes:

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?

Bastiaan Veelo <Bastiaan Veelo.net> writes:

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.

Bastiaan Veelo <Bastiaan Veelo.net> writes:

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.

Guillaume Piolat <first.last gmail.com> writes:

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