* breakpoint.h (bp_location_p): New typedef.

	Register a vector of bp_location_p.
	* breakpoint.c (always_inserted_mode)
	(show_always_inserted_mode): New.
	(unlink_locations_from_global_list): Remove.
	(update_global_location_list)
	(update_global_location_list_nothrow): New.
	(update_watchpoint): Don't free locations.
	(should_insert_location): New.
	(insert_bp_location): Use should_insert_location.
	(insert_breakpoint_locations): Copied from
	insert_breakpoints.
	(insert_breakpoint): Use insert_breakpoint_locations.
	(bpstat_stop_status): Call update_global_location_list
	when disabling breakpoint.
	(allocate_bp_location): Don't add to bp_location_chain.
	(set_raw_breakpoint)
	(create_longjmp_breakpoint, enable_longjmp_breakpoint)
	(disable_longjmp_breakpoint, create_overlay_event_breakpoint)
	(enable_overlay_breakpoints, disable_overlay_breakpoints)
	(set_longjmp_resume_breakpoint)
	(enable_watchpoints_after_interactive_call_stop)
	(disable_watchpoints_before_interactive_call_start)
	(create_internal_breakpoint)
	(create_fork_vfork_event_catchpoint)
	(create_exec_event_catchpoint, set_momentary_breakpoint)
	(create_breakpoints, break_command_1, watch_command_1)
	(create_exception_catchpoint)
	(handle_gnu_v3_exceptions)
	(disable_breakpoint, breakpoint_re_set_one)
	(create_thread_event_breakpoint, create_solib_event_breakpoint)
	(create_ada_exception_breakpoint): : Don't call check_duplicates.
	Call update_global_location_list.
	(delete_breakpoint): Don't remove locations and don't
	try to reinsert them. Call update_global_location_list.
	(update_breakpoint_locations): Likewise.
	(restore_always_inserted_mode): New.
	(update_breakpoints_after_exec): Temporary disable
	always inserted mode.
	* Makefile.in: Update dependencies.

	* infrun.c (proceed): Remove breakpoints while stepping
	over breakpoint.
	(handle_inferior_event): Don't remove or insert
	breakpoints.
	* linux-fork.c (checkpoint_command): Remove breakpoints
	before fork and insert after.
	(linux_fork_context): Remove breakpoints before switch
	and insert after.
	* target.c (target_disconnect, target_detach): Remove
	breakpoints from target.

1 files changed, 24 insertions, 0 deletions

diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index 633779049c6..e422d44b53c 100644
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -3209,6 +3209,30 @@ type.  If the target provides a memory map, @value{GDBN} will warn when
 trying to set software breakpoint at a read-only address.
 @end table
 
+@value{GDBN} normally implements breakpoints by replacing the program code
+at the breakpoint address with a special instruction, which, when
+executed, given control to the debugger.  By default, the program
+code is so modified only when the program is resumed.  As soon as
+the program stops, @value{GDBN} restores the original instructions.  This
+behaviour guards against leaving breakpoints inserted in the
+target should gdb abrubptly disconnect.  However, with slow remote
+targets, inserting and removing breakpoint can reduce the performance.
+This behavior can be controlled with the following commands::
+
+@kindex set breakpoint always-inserted
+@kindex show breakpoint always-inserted
+@table @code
+@item set breakpoint always-inserted off
+This is the default behaviour.  All breakpoints, including newly added
+by the user, are inserted in the target only when the target is
+resumed.  All breakpoints are removed from the target when it stops.
+
+@item set breakpoint always-inserted on
+Causes all breakpoints to be inserted in the target at all times.  If
+the user adds a new breakpoint, or changes an existing breakpoint, the
+breakpoints in the target are updated immediately.  A breakpoint is
+removed from the target only when breakpoint itself is removed.
+@end table
 
 @cindex negative breakpoint numbers
 @cindex internal @value{GDBN} breakpoints