Date: Sun, 23 Jan 2005 15:16:09 +0000 (GMT) From: Robert Watson <rwatson@freebsd.org> To: Petri Helenius <pete@he.iki.fi> Cc: freebsd-threads@freebsd.org Subject: Re: new mutex and thread stuff Message-ID: <Pine.NEB.3.96L.1050123151415.46157I-100000@fledge.watson.org> In-Reply-To: <41F29E62.1000207@he.iki.fi>
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On Sat, 22 Jan 2005, Petri Helenius wrote: > Do I assume correctly that because the new thread stuff (including the > higher performance mutexes) will not be MFC'd to RELENG_5 because they > break the ABI? In general, the documented ABI boundary for applications is the libc interface, and not the kernel system call interface, so subject to some limitations during the upgrade process, there's a lot of scope for changes to the internals of thread implementations without breaking the application ABI. A nice example of this is that using libmap.conf, you can change between libthr, libpthread, and libc_r without breaking anything in the appplication. So subject to careful management of the various ABIs and interfaces, merging new thread work shouldn't be a prohibited for ABI reasons. Robert N M Watson
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