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Re: Thread stack pointers
Does this mean if I define sigaction act, set the handler as follows,
// for stack processing
act.sa_handler = _otf_process_stack;
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
signal the thread in the following manner
if (tkill(m->_tid,i+1) == -1)
fprintf (stderr, "***** tikll failed for thread %d \n. *****", m->_tid);
define the sa_handler function accordingly
_otf_process_stack (int signo)
the stack top for the thread that receives the signal can be give by
something like
stack_top = &signo + sizeOf(pointer)?
Thanks,
Sorry about my previous imcomplete post.
Delvin
On 3/21/07, David Daney <ddaney@avtrex.com> wrote:
Delvin Defoe wrote:
> Hi:
>
> I am implementing a multi-thread, multiprocessor garbage collection
> system for Java in gcc. In the runtime system I need to determine the
> stack base and stack top pointers for each mutator in order to scan
> the stack for each mutator for pointers to live heap objects. Any
> idea how I can determine or compute these pointers?
>
Generic answer:
How about doing the same thing boehm-gc does?
For linux, you would have each thread is register with the GC when it is
started. In this registration function you find the address of
something on the stack of that thread, then look in /proc/self/maps to
see what memory range contains that address. That range will be your
stack bounds.
To find the stack top, send a signal to a thread, and then the stack top
will be slightly above the address of an automatic variable of the
signal handler function.
David Daney
--
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Delvin Defoe
Doctoral Candidate
Department of Computer Science
Washington University in Saint Louis
314.935.4502
http://www.cs.wustl.edu/~dcd2/
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