Subject: Re: libpthread busted?
To: Bill Studenmund <email@example.com>
From: Jason R Thorpe <firstname.lastname@example.org>
Date: 02/28/2003 16:20:16
On Fri, Feb 28, 2003 at 04:02:12PM -0800, Bill Studenmund wrote:
> > >Ah ... is it dynamically-loading libpthread? That does not currently
> > >work.
> The reason Jason thinks it doesn't work is that you've bound to a libc
> mutex operation, which only happens if NetBSD's libpthread isn't around at
> dynamic link time.
Right. Those mutex routines only abort if __isthreaded is set to 1,
which happens in a contructor for the native libpthread. If libpthread
is not present when libc binding happens, then you get the dummy routines
in libc for libc's internal thread-safeness. Then if libpthread is dlopen'd
later, __isthreaded gets set to 1 and all hell breaks loose.
> What MIGHT be happening is that a program's using pth, not NetBSD's
> libpthread. That will be a problem as we have expectations of what
> -lpthread does (overrides some weak symbols in libc) that the pth package
> mightn't be doing.
Well, NetBSD's libpthread got invoked to set __isthreaded somehwere...
-- Jason R. Thorpe <email@example.com>