Openblas hangs in Windows

[Maxxan]

I don't know if there is a way to free OpenBLAS if it's used in a DLL, but when I load a DLL that uses OpenBLAS , and then tries to free it, the FreeLibrary function hangs (deadlock?) and never returns.

I use pre-built package downloaded from http://sourceforge.net/projects/openblas/files/v0.2.8/
compiling the test program with Visual Studio 2010.

Here is code to reproduce the issue:

Dummy DLL using OpenBLAS, does nothing:

include "stdafx.h"

include "cblas.h"

BOOL APIENTRY DllMain( HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)
{
return TRUE;
}

void FunctionNeverCalled()
{
float f = 1;
cblas_sasum(1, &f, 1);
}

---

Program calling the DLL:

include "stdafx.h"

include "Windows.h"

int _tmain(int argc, _TCHAR* argv[])
{
HINSTANCE hInstance = ::LoadLibraryExW(L"..\Debug\DllUsingOpenBlas.dll", NULL, LOAD_WITH_ALTERED_SEARCH_PATH);
::FreeLibrary(hInstance); // Hangs on FreeLibrary
return 0;
}

[xianyi]

Hi @Maxxan ,

Thank you for the report. We didn't test free OpenBLAS dll on Windows. We will try it.

Xianyi

[Maxxan]

Great! And if you find a workaround, then please tell, so I can use current version until bug is fixed.

[xianyi]

Hi @Maxxan ,
I think I fixed this hang bug. Please checkout the latest develop branch.

Xianyi

[Maxxan]

Confirmed, now it works! Great work Xianyi!