Date: Fri, 12 Sep 2008 06:51:10 -0700 From: Jeremy Chadwick <koitsu@FreeBSD.org> To: Barry Andrews <titanandrews@gmail.com> Cc: Daniel Eischen <deischen@freebsd.org>, freebsd-hackers@freebsd.org Subject: Re: loading multi threaded library into executable enabled for single thread Message-ID: <20080912135110.GA57637@icarus.home.lan> In-Reply-To: <eda4c18b0809120626u48fbe5e2pdf7147d71d1f8def@mail.gmail.com> References: <eda4c18b0809111206t6438f87dmb8fab0db939c9980@mail.gmail.com> <Pine.GSO.4.64.0809111620340.13959@sea.ntplx.net> <48CA555A.4050104@gmail.com> <20080912131045.GA56923@icarus.home.lan> <eda4c18b0809120626u48fbe5e2pdf7147d71d1f8def@mail.gmail.com>
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On Fri, Sep 12, 2008 at 09:26:37AM -0400, Barry Andrews wrote: > I don't understand. If it was not broken, then why did it change in later > FreeBSD versions? I should be more explicit: the threading library and implementations have changed over time. There was libc_r, then there was libthr, then there was libkse. This is what we call "evolution". :-) http://www.unobvious.com/bsd/freebsd-threads.html http://kerneltrap.org/node/624 http://www.freebsd.org/kse/ The gcc -pthread flag is still there on present-day FreeBSD (6 through HEAD), and *should* be used. You can choose not to use it but you must ensure during linktime that you explicitly link to -lpthread. > On Fri, Sep 12, 2008 at 9:10 AM, Jeremy Chadwick <koitsu@freebsd.org> wrote: > > > On Fri, Sep 12, 2008 at 07:41:14AM -0400, Barry Andrews wrote: > > > Do you know if this is documented in Release Notes or Known Issues or > > > somewhere? > > > > Why would it be an "issue"? gcc -pthread and libpthread linking is > > documented pretty much everywhere on the web. There isn't anything > > broken about it, it's how it's done on older FreeBSD. > > > > Note that all of this has significantly changed in later FreeBSD > > versions, and that the 5.x series was deprecated a very long time ago. > > > > >> On Thu, 11 Sep 2008, Barry Andrews wrote: > > >> > > >>> Hi All, > > >>> > > >>> I have a multi-threaded library that is linked against libpthread. > > >>> When I > > >>> load this lib into a tclsh process on FreeBSD, I get this error, > > >>> "Recurse on > > >>> private mutex". and crash. I understand that I can have this issue > > >>> when the > > >>> executable is not linked against libpthread but one of the loaded > > >>> libs is. > > >>> Basically, it thinks it's in single threaded mode. > > >> > > >> This must be an older version of FreeBSD. I think you must > > >> link your application (tclsh or whatever) against libpthread > > >> in order for this to work. The libc functions won't get properly > > >> overloaded by their equivalents in libpthread unless you do > > >> this. > > > > -- > > | Jeremy Chadwick jdc at parodius.com | > > | Parodius Networking http://www.parodius.com/ | > > | UNIX Systems Administrator Mountain View, CA, USA | > > | Making life hard for others since 1977. PGP: 4BD6C0CB | > > > > > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org" -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |
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