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Add $_gthread convenience variable

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This commit adds a new $_gthread convenience variable, that is like
$_thread, but holds the current thread's global thread id.

gdb/ChangeLog:
2016-01-13  Pedro Alves  <palves@redhat.com>

	* NEWS: Mention $_gthread.
	* gdbthread.h (struct thread_info) <global_num>: Mention
	$_gthread.
	* thread.c (thread_num_make_value_helper): New function.
	(thread_id_make_value): Delete.
	(thread_id_per_inf_num_make_value, global_thread_id_make_value):
	New.
	(thread_funcs): Adjust.
	(gthread_funcs): New.
	(_initialize_thread): Register $_gthread variable.

gdb/testsuite/ChangeLog:
2016-01-13  Pedro Alves  <palves@redhat.com>

	* gdb.base/default.exp: Expect $_gthread as well.
	* gdb.multi/tids.exp: Test $_gthread.
	* gdb.threads/thread-specific.exp: Test $_gthread.

gdb/doc/ChangeLog:
2016-01-13  Pedro Alves  <palves@redhat.com>

	* gdb.texinfo (Threads): Document the $_gthread convenience
	variable.
	(Convenience Vars): Likewise.
This commit is contained in:
Pedro Alves 2016-01-13 10:56:10 +00:00
parent c84f6bbfe5
commit 663f6d42f4
10 changed files with 89 additions and 11 deletions
Download patch file Download diff file Expand all files Collapse all files

49
gdb/thread.c
View file

@ -2083,18 +2083,45 @@ update_thread_list (void)
update_threads_executing ();
}
/* Return a new value for the selected thread's id. Return a value of
0 if no thread is selected. If GLOBAL is true, return the thread's
global number. Otherwise return the per-inferior number. */
static struct value *
thread_num_make_value_helper (struct gdbarch *gdbarch, int global)
{
struct thread_info *tp = find_thread_ptid (inferior_ptid);
int int_val;
if (tp == NULL)
int_val = 0;
else if (global)
int_val = tp->global_num;
else
int_val = tp->per_inf_num;
return value_from_longest (builtin_type (gdbarch)->builtin_int, int_val);
}
/* Return a new value for the selected thread's per-inferior thread
number. Return a value of 0 if no thread is selected, or no
threads exist. */
static struct value *
thread_id_make_value (struct gdbarch *gdbarch, struct internalvar *var,
void *ignore)
thread_id_per_inf_num_make_value (struct gdbarch *gdbarch, struct internalvar *var,
void *ignore)
{
struct thread_info *tp = find_thread_ptid (inferior_ptid);
return thread_num_make_value_helper (gdbarch, 0);
}
return value_from_longest (builtin_type (gdbarch)->builtin_int,
(tp ? tp->per_inf_num : 0));
/* Return a new value for the selected thread's global id. Return a
value of 0 if no thread is selected, or no threads exist. */
static struct value *
global_thread_id_make_value (struct gdbarch *gdbarch, struct internalvar *var,
void *ignore)
{
return thread_num_make_value_helper (gdbarch, 1);
}
/* Commands with a prefix of `thread'. */
@ -2104,7 +2131,16 @@ struct cmd_list_element *thread_cmd_list = NULL;
static const struct internalvar_funcs thread_funcs =
{
thread_id_make_value,
thread_id_per_inf_num_make_value,
NULL,
NULL
};
/* Implementation of `gthread' variable. */
static const struct internalvar_funcs gthread_funcs =
{
global_thread_id_make_value,
NULL,
NULL
};
@ -2162,6 +2198,7 @@ Show printing of thread events (such as thread start and exit)."), NULL,
&setprintlist, &showprintlist);
create_internalvar_type_lazy ("_thread", &thread_funcs, NULL);
create_internalvar_type_lazy ("_gthread", &gthread_funcs, NULL);
observer_attach_thread_ptid_changed (restore_current_thread_ptid_changed);
}