On Fri, Mar 24, 2006 at 08:54:34PM +0900, Kazuaki Oda wrote: > Kostik Belousov wrote: > > I did understand the purpose of the thread mask code in > > libexec/rtld/rtld_lock.c, or, more precisely, the condition where this code > > works (for the context, see the mails with same subject on freebsd-hackers). > > > > Look, that code assumes that blocking async signals would stop thread > > scheduler from doing preemption of the current thread. This works > > for libc_r, but fails in libpthread and libthr cases. libpthread provides > > implementation of the locks for rtld. But libthr does not ! > > > > As result, rtld exhibit races when used with libthr. In other words, > > libthr needs code to do proper locking. > > > > Do you agree ? Does somebody already planned to do this work ? > > > > Best regards, > > Kostik Belousov > > I'm a bit confused. Do you mean the following? > > * The current implementation of rtld has a problem both with > libpthread and libthr. It works only with libc_r. It does not work correctly with libc_r too. > * In libpthread case, the problem goes away if we modify rtld code. Yes. > * In libthr case, in addition to above, we must modify libthr code to > provide implementation of the locks for rtld. Yes.
pgp7ZNLZkyjwx.pgp
Description: PGP signature
