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* infrun.c (sched_multi): New global.
	(resume): If sched_multi is set, resume only threads of the
	current inferior.
	(prepare_to_proceed): Don't switch over to wait_ptid if we're
	resuming a different inferior, and sched_multi is off.
	(show_schedule_multiple): New.
	(_initialize_infrun): Register new "set schedule-multiple" command.
	* inferior.h (sched_multi): Declare.
	* NEWS: Mention new "schedule-multiple" setting.
gdb/doc/
	* gdb.texinfo (All-Stop): Document new 'set schedule-multiple'
	command.
This commit is contained in:
Pedro Alves 2009-06-11 11:57:46 +00:00
parent 8656620041
commit d4db2f362f
6 changed files with 106 additions and 10 deletions
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12
gdb/ChangeLog
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@ -1,3 +1,15 @@
2009-06-11 Pedro Alves <pedro@codesourcery.com>
* infrun.c (sched_multi): New global.
(resume): If sched_multi is set, resume only threads of the
current inferior.
(prepare_to_proceed): Don't switch over to wait_ptid if we're
resuming a different inferior, and sched_multi is off.
(show_schedule_multiple): New.
(_initialize_infrun): Register new "set schedule-multiple" command.
* inferior.h (sched_multi): Declare.
* NEWS: Mention new "schedule-multiple" setting.
2009-06-11 Pedro Alves <pedro@codesourcery.com>
* varobj.c (varobj_create): Properly restore the selected frame.

5
gdb/NEWS
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@ -305,6 +305,11 @@ show libthread-db-search-path
Control list of directories which GDB will search for appropriate
libthread_db.
set schedule-multiple (on|off)
show schedule-multiple
Allow GDB to resume all threads of all processes or only threads of
the current process.
* New native configurations
x86/x86_64 Darwin i[34567]86-*-darwin*

5
gdb/doc/ChangeLog
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@ -1,3 +1,8 @@
2009-06-11 Pedro Alves <pedro@codesourcery.com>
* gdb.texinfo (All-Stop): Document new 'set schedule-multiple'
command.
2009-06-07 Pedro Alves <pedro@codesourcery.com>
* gdbint.texinfo (TARGET_HAS_HARDWARE_WATCHPOINTS): Delete all

30
gdb/doc/gdb.texinfo
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@ -4650,6 +4650,36 @@ the current thread away from the thread that you are debugging.
Display the current scheduler locking mode.
@end table
@cindex resume threads of multiple processes simultaneously
By default, when you issue one of the execution commands such as
@code{continue}, @code{next} or @code{step}, @value{GDBN} allows only
threads of the current inferior to run. For example, if @value{GDBN}
is attached to two inferiors, each with two threads, the
@code{continue} command resumes only the two threads of the current
inferior. This is useful, for example, when you debug a program that
forks and you want to hold the parent stopped (so that, for instance,
it doesn't run to exit), while you debug the child. In other
situations, you may not be interested in inspecting the current state
of any of the processes @value{GDBN} is attached to, and you may want
to resume them all until some breakpoint is hit. In the latter case,
you can instruct @value{GDBN} to allow all threads of all the
inferiors to run with the @w{@code{set schedule-multiple}} command.
@table @code
@kindex set schedule-multiple
@item set schedule-multiple
Set the mode for allowing threads of multiple processes to be resumed
when an execution command is issued. When @code{on}, all threads of
all processes are allowed to run. When @code{off}, only the threads
of the current process are resumed. The default is @code{off}. The
@code{scheduler-locking} mode takes precedence when set to @code{on},
or while you are stepping and set to @code{step}.
@item show schedule-multiple
Display the current mode for resuming the execution of threads of
multiple processes.
@end table
@node Non-Stop Mode
@subsection Non-Stop Mode

2
gdb/inferior.h
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@ -135,6 +135,8 @@ extern void clear_proceed_status (void);
extern void proceed (CORE_ADDR, enum target_signal, int);
extern int sched_multi;
/* When set, stop the 'step' command if we enter a function which has
no line number information. The normal behavior is that we step
over such function. */

62
gdb/infrun.c
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@ -1091,6 +1091,11 @@ set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c)
}
}
/* True if execution commands resume all threads of all processes by
default; otherwise, resume only threads of the current inferior
process. */
int sched_multi = 0;
/* Try to setup for software single stepping over the specified location.
Return 1 if target_resume() should use hardware single step.
@ -1201,13 +1206,25 @@ a command like `return' or `jump' to continue execution."));
{
ptid_t resume_ptid;
resume_ptid = RESUME_ALL; /* Default */
/* If STEP is set, it's a request to use hardware stepping
facilities. But in that case, we should never
use singlestep breakpoint. */
gdb_assert (!(singlestep_breakpoints_inserted_p && step));
/* Decide the set of threads to ask the target to resume. Start
by assuming everything will be resumed, than narrow the set
by applying increasingly restricting conditions. */
/* By default, resume all threads of all processes. */
resume_ptid = RESUME_ALL;
/* Maybe resume only all threads of the current process. */
if (!sched_multi && target_supports_multi_process ())
{
resume_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid));
}
/* Maybe resume a single thread after all. */
if (singlestep_breakpoints_inserted_p
&& stepping_past_singlestep_breakpoint)
{
@ -1224,9 +1241,8 @@ a command like `return' or `jump' to continue execution."));
to support, and has no value. */
resume_ptid = inferior_ptid;
}
if ((step || singlestep_breakpoints_inserted_p)
&& tp->trap_expected)
else if ((step || singlestep_breakpoints_inserted_p)
&& tp->trap_expected)
{
/* We're allowing a thread to run past a breakpoint it has
hit, by single-stepping the thread with the breakpoint
@ -1240,8 +1256,7 @@ a command like `return' or `jump' to continue execution."));
breakpoint, not just the one at PC. */
resume_ptid = inferior_ptid;
}
if (non_stop)
else if (non_stop)
{
/* With non-stop mode on, threads are always handled
individually. */
@ -1394,11 +1409,19 @@ prepare_to_proceed (int step)
|| (scheduler_mode == schedlock_step
&& step));
/* Don't switch over to WAIT_PTID if scheduler locking is on. */
if (schedlock_enabled)
return 0;
/* Don't switch over if we're about to resume some other process
other than WAIT_PTID's, and schedule-multiple is off. */
if (!sched_multi
&& ptid_get_pid (wait_ptid) != ptid_get_pid (inferior_ptid))
return 0;
/* Switched over from WAIT_PID. */
if (!ptid_equal (wait_ptid, minus_one_ptid)
&& !ptid_equal (inferior_ptid, wait_ptid)
/* Don't single step WAIT_PID if scheduler locking is on. */
&& !schedlock_enabled)
&& !ptid_equal (inferior_ptid, wait_ptid))
{
struct regcache *regcache = get_thread_regcache (wait_ptid);
@ -5567,6 +5590,13 @@ show_non_stop (struct ui_file *file, int from_tty,
value);
}
static void
show_schedule_multiple (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
fprintf_filtered (file, _("\
Resuming the execution of threads of all processes is %s.\n"), value);
}
void
_initialize_infrun (void)
@ -5746,6 +5776,18 @@ step == scheduler locked during every single-step operation.\n\
show_scheduler_mode,
&setlist, &showlist);
add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\
Set mode for resuming threads of all processes."), _("\
Show mode for resuming threads of all processes."), _("\
When on, execution commands (such as 'continue' or 'next') resume all\n\
threads of all processes. When off (which is the default), execution\n\
commands only resume the threads of the current process. The set of\n\
threads that are resumed is further refined by the scheduler-locking\n\
mode (see help set scheduler-locking)."),
NULL,
show_schedule_multiple,
&setlist, &showlist);
add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\
Set mode of the step operation."), _("\
Show mode of the step operation."), _("\