From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <467639BE.30504@domain.hid> Date: Mon, 18 Jun 2007 09:52:30 +0200 From: Jan Kiszka MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig8E56E439309BD94F4A731B63" Sender: jan.kiszka@domain.hid Subject: [Xenomai-core] [PATCH-STACK] Synchronised timebases and more List-Id: "Xenomai life and development \(bug reports, patches, discussions\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: xenomai-core This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig8E56E439309BD94F4A731B63 Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: quoted-printable Hi, after Philippe tried hard to shrink my queue, I was at least able to add one new major patch: Trying to write down the docs for rtdm_timer I realised that we really need to do something about this scenario: multiple skins on different time bases are exchanging time stamps directly or indirectly (e.g. via RTDM devices). So far, those time stamps would be hopelessly out of sync and could easily break things. The answer I found is to synchronise all time bases as good as possible. That means if one base changes its wall clock offset, all others need to be adjusted as well. At this chance, we would also implement synchronisation of the time bases on the system clock when they get started. Because skins may work with different type width to represent time, relative changes have to be applied, i.e. the core API changes from xntbase_set_time(new_time) to xntbase_adjust_time(relative_change). The patch (global-wallclock.patch) finally touches more parts than I was first hoping. Here is the full list: - synchronise slave time bases on the master on xntbase_start - xntbase_set_time -> xntbase_adjust_time, fixing all time bases currently registered - make xnarch_start_timer return the nanos since the last host tick (only ia64 affected, all others return 0 anyway, causing one tick off when synchronising on system time -- but this fiddling becomes pointless on the long term due to better clocksourses on all archs) - adapt vrtx, vxworks, and psos+ skin to new scheme, fixing sc_sclock at this chance - make xnarch_get_sys_time internal, no skin should (need to) touch this anymore The patch is lightly tested and appears to meet its goals. However, the changes are fundamental and need careful review. Other changes in the current stack: - configure link test for sched_setaffinity (see earlier posting) - kill svctable from the pod structure - updated ltt patch Please check http://www.rts.uni-hannover.de/rtaddon/patches/xenomai Jan --------------enig8E56E439309BD94F4A731B63 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFGdjm+niDOoMHTA+kRAq5tAJ9vvHrQASS7nAvJyY3A/YuskoeUnACfRTtG k3MUF4Wf4r5E8bSwDcoNG+E= =/3ZZ -----END PGP SIGNATURE----- --------------enig8E56E439309BD94F4A731B63--