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Date: Wed, 23 Jul 2008 23:38:17 -0700 (PDT)
From: Stefano Facchetti <s DOT facchetti AT kline DOT it>
To: cygwin AT cygwin DOT com
Subject: RE: Cygwin dll from C# Application
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Following the tutorial, I modify my code.. 
But when I call a dll method from C# application, it immediatly freeze.

Here the code:

faddll.h
#include <string>
#include <map>
#include <vector>

namespace cygwin
{
  class padding {
  public:
    padding ();
    ~padding ();

  private:
    std::vector< char > _backup;
    char *_stackbase, *_end;
    char _padding[4096];

    static padding *_main;
    static DWORD _mainTID;
  };
}

faddll.cc
#include <stdio.h>
#include <windows.h>
#include <faddll.h>

#define DllExport extern "C" __declspec(dllexport)

cygwin::padding *cygwin::padding::_main = NULL;
DWORD cygwin::padding::_mainTID = 0;
static std::ostream *out = NULL;

cygwin::padding::padding ()
{
  _main = this;
  _mainTID = GetCurrentThreadId ();

  _end = _padding + sizeof (_padding);
  char *stackbase;
#ifdef __GNUC__
  __asm__ (
    "movl %%fs:4, %0"
    :"=r"(stackbase)
    );
#else
  __asm
      {
        mov eax, fs:[4];
        mov stackbase, eax;
      }
#endif
  _stackbase = stackbase;

  if ((_stackbase - _end) != 0)
    {
      size_t delta = (_stackbase - _end);

      _backup.resize (delta);

      memcpy (&(_backup[0]), _end, delta);
    }
}

cygwin::padding::~padding ()
{
  _main = NULL;

  if (_backup.size ())
    {
      memcpy (_end, &(_backup[0]), _backup.size ());
    }
}

DllExport int Somma(int a,int b);

int Somma(int a, int b)
{  
   cygwin::padding padding;

   HMODULE h = LoadLibrary("cygwin1.dll");
   void (*init)() = (void(*)()) GetProcAddress(h,"cygwin_dll_init");
   init();

   return a+b;
}




Dave Korn wrote:
> 
>   The path refers to a location in the sourceware.org CVS repository.  You
> could check out the winsup module using CVS, you could use setup.exe to
> install the source for your current version of the Cygwin dll and look for
> it there, or you can just browse it through the sourceware.org cvsweb
> interface, at:
> 
> http://cygwin.com/cgi-bin/cvsweb.cgi/src/winsup/cygwin/how-cygtls-works.txt?
> cvsroot=src
> 

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