Date: Mon, 4 Feb 2008 14:56:30 -0500 From: John Baldwin <jhb@freebsd.org> To: freebsd-threads@freebsd.org Cc: "Karl H. Beckers" <karl.h.beckers@gmx.net>, Daniel Eischen <deischen@freebsd.org>, Dag-Erling =?iso-8859-1?q?Sm=C3=B8rgrav?= <des@des.no> Subject: Re: threading in FreeBSD (acx_pthreads) Message-ID: <200802041456.30785.jhb@freebsd.org> In-Reply-To: <58004.192.9.112.196.1202145786.squirrel@www.our-isp.org> References: <5913.192.9.112.196.1202124683.squirrel@www.our-isp.org> <Pine.GSO.4.64.0802041157030.13899@sea.ntplx.net> <58004.192.9.112.196.1202145786.squirrel@www.our-isp.org>
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On Monday 04 February 2008 12:23:06 pm Karl H. Beckers wrote: > whoa, > > slowly please, you're loosing me. So, there is: > > -lthr > -pthread > -lpthread > -lc_r > lthread > -kthread > > I've read one opinion (a) saying I should use: > -lthr -lpthread -lc_r (because -pthread might not be safe on all versions) > > the autoconf module (b) does: > -kthread lthread -pthread (now what's -kthread and lthread and how do they > relate to -lthr or -lc_r) > > And the other opinion (c) I heard was: > -pthread -lc_r (and leave anything else to the user and PTHREAD_LIBS) > > And I take it that (c) is what your ports system is doing and the > discussion is around whether that's the right thing to do? Just -pthread, no -lc_r. On 4.x -pthread expands to -D_REENTRANT -lc_r (or something like that). On 5.x+ -pthread expands to -lpthread. IOW, -pthread always expands to the appropriate system default. If you want to use libthr on 6.x then you can either explicitly say -lthr instead of -pthread or rename libpthread to libkse and symlink libpthread to libthr. (Or use libmap.conf to map libpthread to libthr, etc.). Also, FWIW DES, at work when folks did benchmarks for Java stuff on 6.x, libkse had better performance than libthr. Granted, Java is a bit more of an odd benchmark b/c it is thread happy and thus more suited to a M:N model than most other threading workloads. -- John Baldwin
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