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Date:	Thu, 20 Feb 2014 17:02:55 +0100
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: Bug with dlopen() and fork()
Message-ID:	<20140220160255.GB9321@calimero.vinschen.de>
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On Feb 20 10:38, Christopher Faylor wrote:
> On Thu, Feb 20, 2014 at 03:57:27PM +0100, Corinna Vinschen wrote:
> >On Feb 20 14:16, Jaime Fabregas Fernandez wrote:
> >> Hello Corinna,
> >>=20
> >> As you've checked, this behaviour doesn't appear with dll's created by
> >> gcc, but it does with Visual Studio C++.
> >> That minimal example compiled with VS will result in the freeze of the
> >> child process.
> >>=20
> >> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D testlib.h =3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> >> #ifdef TESTLIB_EXPORTS
> >> #define TEST_API extern "C" __declspec(dllexport)
> >> #else
> >> #define TEST_API extern "C" __declspec(dllimport)
> >> #endif
> >>=20
> >> TEST_API  int  mylib_open (const char *foo);
> >> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> >>=20
> >> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D testlib.cpp =3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> >> #include "stdafx.h"
> >> #include "testLib.h"
> >>=20
> >>   int
> >>   mylib_open (const char *foo)
> >>   {
> >>     return 1;
> >>   }
> >> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> >>=20
> >> I've tested several compiler and linker options with same result.
> >>=20
> >> Any ideas?
> >
> >Using MS DLLs across fork in this way is unsupported.  If you get it
> >working, you're just lucky.
>=20
> Too bad.  We >just< missed the Thursday window.

Indeed.  But http://cygwin.com/acronyms/#PTC still applies, if this is
possible at all with Visual Studio DLLs, I think.


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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