Date: Wed, 4 Jul 2007 17:04:26 +0200 From: "=?iso-8859-1?Q?david.chosrova@libertysurf.fr?=" <david.chosrova@libertysurf.fr> To: "=?iso-8859-1?Q?freebsd-hackers?=" <freebsd-hackers@freebsd.org> Subject: kernel dynamic references Message-ID: <JKNTVE$C5A4D26735C4FC1C6F888C434208B096@aliceadsl.fr>
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=0D=0AHi,=0D=0A=0D=0A I'm new to Freebsd and interested in system program=
ming. So I'have picked up a task from the project ideas list to start wit=
h.=0D=0A (part of) the subject is : "This task is to define and implement=
a general mechanism for tracking these references and use them in handli=
ng module unload requests."=0D=0A=0D=0ASo, to do that, I'have added an "i=
nt dynrefs" in struct module (kern_module.c), and functions to increase o=
r decrease this count (module_add/remove_dynrefs(const char * modname) an=
d module_updatedynrefs(const char * modname, int action) ) in kern_module=
.c.=0D=0A=0D=0A To avoid unload of a module which has a dynrefs count !=3D=
0 , I have modified module_unload(), so that unload is process only if =
dynrefs=3D0 or flag=3DLINKER_UNLOAD_FORCE.=0D=0A=0D=0A module_unload(modu=
le_t mod, int flags)=0D=0A {=0D=0A int error;=0D=0A- error =3D MOD_EVENT=
(mod, MOD_QUIESCE);=0D=0A+ MOD_SLOCK;=0D=0A+ (mod->dynrefs =3D=3D 0) ? (e=
rror =3D MOD_EVENT(mod, MOD_QUIESCE)) : (error =3D EPERM);=0D=0A+ MOD_SUN=
LOCK;=0D=0A=0D=0A=0D=0A=0D=0A I have compiled and tested. with a 6-2 RELE=
ASE. For the test I'have used two dummy module, one adding a dynrefs on t=
he other.=0D=0A=0D=0A Any comment are welcome=0D=0A=0D=0A David chosrova =
=0D=0A=0D=0A=0D=0A=0D=0A=0A=0A------------------------ ALICE C'EST ENCORE=
MIEUX AVEC CANAL+ LE BOUQUET ! ---------------=0AD=E9couvrez vite l'offr=
e exclusive ALICEBOX et CANAL+ LE BOUQUET, en cliquant ici http://alicebo=
x.fr=0ASoumis =E0 conditions.=0A
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