Date: Thu, 20 Nov 2003 02:32:24 -0800 From: Marcel Moolenaar <marcel@xcllnt.net> To: Daniel Eischen <eischen@vigrid.com> Cc: threads@freebsd.org Subject: Re: KSE/ia64 broken Message-ID: <20031120103224.GB10417@dhcp01.pn.xcllnt.net> In-Reply-To: <Pine.GSO.4.10.10311191627050.15552-100000@pcnet5.pcnet.com> References: <20031117014620.GB61716@dhcp01.pn.xcllnt.net> <Pine.GSO.4.10.10311191627050.15552-100000@pcnet5.pcnet.com>
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On Wed, Nov 19, 2003 at 04:27:51PM -0500, Daniel Eischen wrote:
> On Sun, 16 Nov 2003, Marcel Moolenaar wrote:
>
> > The memory block is clobbered by a ucontext_t. This may be the result
> > of the kernel doing the upcall (though indirectly I would suspect).
>
> Any more on this. I haven't been able to find anything
> on our end.
Another piece of the puzzle. If you apply the attached patch, KSE
works with rev 1.18 of thr_spinlock.c. I have to analyze how this
makes a difference, but my first guess is that the syscall results
in an upcall and a context switch (be it to the same thread). This
sanitizes internal state and prevents corruption. More tomorrow...
--
Marcel Moolenaar USPA: A-39004 marcel@xcllnt.net
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Index: pthread_md.h
===================================================================
RCS file: /home/ncvs/src/lib/libpthread/arch/ia64/include/pthread_md.h,v
retrieving revision 1.11
diff -u -r1.11 pthread_md.h
--- pthread_md.h 19 Sep 2003 23:28:13 -0000 1.11
+++ pthread_md.h 20 Nov 2003 10:07:37 -0000
@@ -35,7 +35,10 @@
#define KSE_STACKSIZE 16384
-#define THR_GETCONTEXT(ucp) _ia64_save_context(&(ucp)->uc_mcontext)
+#define THR_GETCONTEXT(ucp) do { \
+ __sys_write(1, "X\n", 2); \
+ _ia64_save_context(&(ucp)->uc_mcontext); \
+ } while (0)
#define THR_SETCONTEXT(ucp) PANIC("THR_SETCONTEXT() now in use!\n")
#define PER_THREAD
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