Wine, Windows.Forms on Linux, GC and segfaults.

[Marcus Meissner]

On Tue, Dec 10, 2002 at 08:41:34PM -0500, Miguel de Icaza wrote:
> Hello,
> 
>     With the help of Hans Boehm, I have been tracking the problems we
> have to run the Windows.Forms code with GC enabled.  Turns out that the
> problem is not the Boehm code at all, it just exposes a problem that
> might be happening elsewhere.
> 
>     The problem is that by the time that Wine has been initialized,
> using setjmp/longjmp will always lead to a crash.  The code in pthreads
> that performs the longjmp will first try to invoke the pthread cleanup
> routines, and then invoke longjmp.  This never happens.
> 
>     In the particular case of Mono, I added a small bit of code before
> calling into Boehm's GC, and then I run my app like this:
> 
> 	wine monostub.exe.so 
> 
>      The code snippet is:
> 
> 	jmp_buf buf;
> 	
> 	printf ("Here\n");
> 	if (setjmp (buf) == 0){
> 		printf ("before\n");
> 		longjmp (buf, 1);
> 	} else {
> 		printf ("after\n");		
> 	}
> 
>      The code should display:
> 
> 	Here
> 	before
> 	after
> 
>       But with Wine, I get a crash inside longjmp, after the "before" is
> printed out.  I get the Wine Console with the stack trace, but I can not
> copy/paste from it, so I have included a screenshot of it.

You currently cannot use the wine libraries together with -lpthread.

WINE already overwrites and reimplements several pthread_ functions
which probably leads to internal confusion and the crash above.

Difficult to solve :/

Ciao, Marcus