Re: Get the caller of socket_lock()

• Subject: Re: Get the caller of socket_lock()
• From: Michael Tuexen <email@hidden>
• Date: Wed, 2 Aug 2006 22:49:12 +0200
• Delivered-to: email@hidden
• Delivered-to: email@hidden

Hi Laurent,

hmmm, sounds really good, but we do not see the symbols you mention
being part of the socket structure... How can we access the fields
in gdb?

Thank you very much in advance.

Best regards
Michael

On Aug 2, 2006, at 10:23 PM, Laurent Dumont wrote:

Michael,

On 10.4.x for i386 there is a slightly different debug mechanism for the
socket lock and unlock. Instead of reserved3 and reserverd4, there is
circular buffers with the 4 last lock/unlocks for the socket:

        u_int32_t lock_lr[4];
        int next_lock_lr;
        u_int32_t unlock_lr[4];
        int next_unlock_lr;

"next_lock_lr" and "next_unlock_lr" provide the number (0 to 3) for the next
debug link register slot to be used. You can work your way from n-1 and find
the last four lock/unlock recorded for that socket.

Laurent

on 8/2/06 11:23, Michael Tuexen at email@hidden wrote:

Dear all,

we are currently debugging a locking issue on Mac OS X on Intel. It
is related to
socket locks and we are able to break into the debugger to inspect
the socket
structures. On PPC one can find the last caller of the socket_lock()
function,
but is there a similar way in doing it in Intel, possibly by
inspecting the reserved3
or reserved4 fields in the socket structure? What is stored in these
fields?

Thank you very much for your help in advance.

Best regards
Michael

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