[RFC 1/3] make reinsert breakpoint thread specific

[Yao Qi <qiyaoltc@gmail.com>]

gdb/gdbserver:

2016-05-06  Yao Qi  <yao.qi@linaro.org>

	* mem-break.c (struct breakpoint) <thread>: New field.
	(set_reinsert_breakpoint): New parameter thread.  Callers
	updated.
	(delete_reinsert_breakpoints): Likewise.
	* mem-break.h (set_reinsert_breakpoint): Update declaration.
	(delete_reinsert_breakpoints): Likewise.
---
 gdb/gdbserver/linux-low.c |  4 ++--
 gdb/gdbserver/mem-break.c | 11 ++++++++---
 gdb/gdbserver/mem-break.h |  8 ++++----
 3 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/gdb/gdbserver/linux-low.c b/gdb/gdbserver/linux-low.c
index 8e1e2fc..e539e34 100644
--- a/gdb/gdbserver/linux-low.c
+++ b/gdb/gdbserver/linux-low.c
@@ -4080,7 +4080,7 @@ install_software_single_step_breakpoints (struct lwp_info *lwp)
   next_pcs = (*the_low_target.get_next_pcs) (regcache);
 
   for (i = 0; VEC_iterate (CORE_ADDR, next_pcs, i, pc); ++i)
-    set_reinsert_breakpoint (pc);
+    set_reinsert_breakpoint (pc, current_thread);
 
   do_cleanups (old_chain);
 }
@@ -4705,7 +4705,7 @@ finish_step_over (struct lwp_info *lwp)
 	 because we were stepping over a breakpoint, and we hold all
 	 threads but LWP stopped while doing that.  */
       if (!can_hardware_single_step ())
-	delete_reinsert_breakpoints ();
+	delete_reinsert_breakpoints (get_lwp_thread (lwp));
 
       step_over_bkpt = null_ptid;
       return 1;
diff --git a/gdb/gdbserver/mem-break.c b/gdb/gdbserver/mem-break.c
index 363d7ca..197d7a1 100644
--- a/gdb/gdbserver/mem-break.c
+++ b/gdb/gdbserver/mem-break.c
@@ -190,6 +190,10 @@ struct breakpoint
      the breakpoint shall be deleted; 0 or if this callback is NULL,
      it will be left inserted.  */
   int (*handler) (CORE_ADDR);
+
+  /* The owner of this breakpoint if it is not NULL.  It is only used
+     by reinsert breakpoint so far.  */
+  struct thread_info *thread;
 };
 
 /* Return the breakpoint size from its kind.  */
@@ -1407,16 +1411,17 @@ gdb_breakpoint_here (CORE_ADDR where)
 }
 
 void
-set_reinsert_breakpoint (CORE_ADDR stop_at)
+set_reinsert_breakpoint (CORE_ADDR stop_at, struct thread_info *thread)
 {
   struct breakpoint *bp;
 
   bp = set_breakpoint_at (stop_at, NULL);
   bp->type = reinsert_breakpoint;
+  bp->thread = thread;
 }
 
 void
-delete_reinsert_breakpoints (void)
+delete_reinsert_breakpoints (struct thread_info *thread)
 {
   struct process_info *proc = current_process ();
   struct breakpoint *bp, **bp_link;
@@ -1426,7 +1431,7 @@ delete_reinsert_breakpoints (void)
 
   while (bp)
     {
-      if (bp->type == reinsert_breakpoint)
+      if (bp->type == reinsert_breakpoint && bp->thread == thread)
 	{
 	  *bp_link = bp->next;
 	  release_breakpoint (proc, bp);
diff --git a/gdb/gdbserver/mem-break.h b/gdb/gdbserver/mem-break.h
index 4d9a76c..2744584 100644
--- a/gdb/gdbserver/mem-break.h
+++ b/gdb/gdbserver/mem-break.h
@@ -150,13 +150,13 @@ struct breakpoint *set_breakpoint_at (CORE_ADDR where,
 
 int delete_breakpoint (struct breakpoint *bkpt);
 
-/* Set a reinsert breakpoint at STOP_AT.  */
+/* Set a reinsert breakpoint at STOP_AT for THREAD.  */
 
-void set_reinsert_breakpoint (CORE_ADDR stop_at);
+void set_reinsert_breakpoint (CORE_ADDR stop_at, struct thread_info *thread);
 
-/* Delete all reinsert breakpoints.  */
+/* Delete all reinsert breakpoints of THREAD.  */
 
-void delete_reinsert_breakpoints (void);
+void delete_reinsert_breakpoints (struct thread_info *thread);
 
 /* Reinsert breakpoints at WHERE (and change their status to
    inserted).  */
-- 
1.9.1