[RFA]: Watchpoints per thread patch

[Jeff Johnston]

Daniel Jacobowitz wrote:
> On Wed, Oct 20, 2004 at 01:27:15PM -0400, Andrew Cagney wrote:
> 
>>the underlying target (ia64-linux-nat, ...) can locally override the 
>>method and handle the problem.  The code's the same, but how it is wired 
>>up is different
>>
>>Sound reasonable to all?
> 
> 
> I think that sounds pretty good.  Hopefully the changes involved will
> be pretty small, since I imagine that most GNU/Linux targets with
> hardware watchpoints will want it.
> 

The attached patch is the rework of my original attempt.  It no longer uses 
configuration or magic defines.  Per Mark's suggestion, it uses an observer to 
handle inserting watchpoints on a new thread and only the low-level code knows 
about inserting/removing watchpoints on all threads.

Ok to commit?

-- Jeff J.

2004-10-27  Jeff Johnston  <jjohnstn@redhat.com>

         * breakpoint.c (insert_watchpoints_for_new_thread): New function.
         * breakpoint.h (insert_watchpoints_for_new_thread): New prototype.
         * ia64-linux-nat.c (ia64_linux_insert_one_watchpoint): New function.
         (ia64_linux_insert_watchpoint_callback): Ditto.
         (ia64_linux_insert_watchpoint): Change to iterate through lwps
         and insert the specified watchpoint per thread.
         (ia64_linux_remove_one_watchpoint): New function.
         (ia64_linux_remove_watchpoint_callback): Ditto.
         (ia64_linux_remove_watchpoint): Change to iterate through lwps and
         remove the specified watchpoint for each thread.
         (ia64_linux_new_thread): New thread observer.
         (_initialize_ia64_linux_nat): New function.  Initialize
         new thread observer.
         * thread-db.c (attach_thread): Notify any observers of the new
         thread event.
         * s390-nat.c (s390_tid): New function.
         (s390_inferior_tid): Change to call s390_tid.
         (s390_remove_one_watchpoint): New function.
         (s390_remove_watchpoint_callback): Ditto.
         (s390_remove_watchpoint): Change to iterate through lwps and
         remove the specified watchpoint for each thread.
         (s390_insert_one_watchpoint): New function.
         (s390_insert_watchpoint_callback): Ditto.
         (s390_insert_watchpoint): Change to iterate through lwps and
         insert the specified watchpoint on each thread.
         (s390_new_thread): New thread observer.
         (_initialize_s390_nat): New function.  Initialize
         new thread observer.

doc/ChangeLog:

2004-10-27  Jeff Johnston  <jjohnstn@redhat.com>

         * observer.texi (new_thread): New observer.

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