/* Multi-process/thread control for GDB, the GNU debugger.
Copyright (C) 1986, 1987, 1988, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
- 2000, 2001, 2002, 2003, 2004, 2007 Free Software Foundation, Inc.
+ 2000, 2001, 2002, 2003, 2004, 2007, 2008, 2009
+ Free Software Foundation, Inc.
Contributed by Lynx Real-Time Systems, Inc. Los Gatos, CA.
#include <sys/types.h>
#include <signal.h>
#include "ui-out.h"
+#include "observer.h"
+#include "annotate.h"
+#include "cli/cli-decode.h"
/* Definition of struct thread_info exported to gdbthread.h */
static struct thread_info *thread_list = NULL;
static int highest_thread_num;
-static struct thread_info *find_thread_id (int num);
-
static void thread_command (char *tidstr, int from_tty);
static void thread_apply_all_command (char *, int);
static int thread_alive (struct thread_info *);
static void info_threads_command (char *, int);
static void thread_apply_command (char *, int);
static void restore_current_thread (ptid_t);
-static void switch_to_thread (ptid_t ptid);
static void prune_threads (void);
-static struct cleanup *make_cleanup_restore_current_thread (ptid_t,
- struct frame_id);
-void
-delete_step_resume_breakpoint (void *arg)
+/* Frontend view of the thread state. Possible extensions: stepping,
+ finishing, until(ling),... */
+enum thread_state
{
- struct breakpoint **breakpointp = (struct breakpoint **) arg;
- struct thread_info *tp;
+ THREAD_STOPPED,
+ THREAD_RUNNING,
+ THREAD_EXITED,
+};
- if (*breakpointp != NULL)
- {
- delete_breakpoint (*breakpointp);
- for (tp = thread_list; tp; tp = tp->next)
- if (tp->step_resume_breakpoint == *breakpointp)
- tp->step_resume_breakpoint = NULL;
+struct thread_info*
+inferior_thread (void)
+{
+ struct thread_info *tp = find_thread_ptid (inferior_ptid);
+ gdb_assert (tp);
+ return tp;
+}
- *breakpointp = NULL;
+void
+delete_step_resume_breakpoint (struct thread_info *tp)
+{
+ if (tp && tp->step_resume_breakpoint)
+ {
+ delete_breakpoint (tp->step_resume_breakpoint);
+ tp->step_resume_breakpoint = NULL;
}
}
static void
-free_thread (struct thread_info *tp)
+clear_thread_inferior_resources (struct thread_info *tp)
{
/* NOTE: this will take care of any left-over step_resume breakpoints,
- but not any user-specified thread-specific breakpoints. */
+ but not any user-specified thread-specific breakpoints. We can not
+ delete the breakpoint straight-off, because the inferior might not
+ be stopped at the moment. */
if (tp->step_resume_breakpoint)
- delete_breakpoint (tp->step_resume_breakpoint);
+ {
+ tp->step_resume_breakpoint->disposition = disp_del_at_next_stop;
+ tp->step_resume_breakpoint = NULL;
+ }
+
+ bpstat_clear (&tp->stop_bpstat);
+
+ discard_all_intermediate_continuations_thread (tp);
+ discard_all_continuations_thread (tp);
+}
+
+static void
+free_thread (struct thread_info *tp)
+{
+ clear_thread_inferior_resources (tp);
/* FIXME: do I ever need to call the back-end to give it a
chance at this private data before deleting the thread? */
struct thread_info *tp, *tpnext;
highest_thread_num = 0;
+
if (!thread_list)
return;
thread_list = NULL;
}
-/* add_thread now returns a pointer to the new thread_info,
- so that back_ends can initialize their private data. */
+/* Allocate a new thread with target id PTID and add it to the thread
+ list. */
-struct thread_info *
-add_thread (ptid_t ptid)
+static struct thread_info *
+new_thread (ptid_t ptid)
{
struct thread_info *tp;
- tp = (struct thread_info *) xmalloc (sizeof (*tp));
- memset (tp, 0, sizeof (*tp));
+ tp = xcalloc (1, sizeof (*tp));
+
tp->ptid = ptid;
tp->num = ++highest_thread_num;
tp->next = thread_list;
thread_list = tp;
+
+ /* Nothing to follow yet. */
+ tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
+ tp->state_ = THREAD_STOPPED;
+
return tp;
}
-void
-delete_thread (ptid_t ptid)
+struct thread_info *
+add_thread_silent (ptid_t ptid)
+{
+ struct thread_info *tp;
+
+ tp = find_thread_ptid (ptid);
+ if (tp)
+ /* Found an old thread with the same id. It has to be dead,
+ otherwise we wouldn't be adding a new thread with the same id.
+ The OS is reusing this id --- delete it, and recreate a new
+ one. */
+ {
+ /* In addition to deleting the thread, if this is the current
+ thread, then we need to take care that delete_thread doesn't
+ really delete the thread if it is inferior_ptid. Create a
+ new template thread in the list with an invalid ptid, switch
+ to it, delete the original thread, reset the new thread's
+ ptid, and switch to it. */
+
+ if (ptid_equal (inferior_ptid, ptid))
+ {
+ tp = new_thread (ptid);
+
+ /* Make switch_to_thread not read from the thread. */
+ tp->state_ = THREAD_EXITED;
+ switch_to_thread (minus_one_ptid);
+
+ /* Now we can delete it. */
+ delete_thread (ptid);
+
+ /* Now reset its ptid, and reswitch inferior_ptid to it. */
+ tp->ptid = ptid;
+ tp->state_ = THREAD_STOPPED;
+ switch_to_thread (ptid);
+
+ observer_notify_new_thread (tp);
+
+ /* All done. */
+ return tp;
+ }
+ else
+ /* Just go ahead and delete it. */
+ delete_thread (ptid);
+ }
+
+ tp = new_thread (ptid);
+ observer_notify_new_thread (tp);
+
+ return tp;
+}
+
+struct thread_info *
+add_thread_with_info (ptid_t ptid, struct private_thread_info *private)
+{
+ struct thread_info *result = add_thread_silent (ptid);
+
+ result->private = private;
+
+ if (print_thread_events)
+ printf_unfiltered (_("[New %s]\n"), target_pid_to_str (ptid));
+
+ annotate_new_thread ();
+ return result;
+}
+
+struct thread_info *
+add_thread (ptid_t ptid)
+{
+ return add_thread_with_info (ptid, NULL);
+}
+
+/* Delete thread PTID. If SILENT, don't notify the observer of this
+ exit. */
+static void
+delete_thread_1 (ptid_t ptid, int silent)
{
struct thread_info *tp, *tpprev;
if (!tp)
return;
+ /* If this is the current thread, or there's code out there that
+ relies on it existing (refcount > 0) we can't delete yet. Mark
+ it as exited, and notify it. */
+ if (tp->refcount > 0
+ || ptid_equal (tp->ptid, inferior_ptid))
+ {
+ if (tp->state_ != THREAD_EXITED)
+ {
+ observer_notify_thread_exit (tp, silent);
+
+ /* Tag it as exited. */
+ tp->state_ = THREAD_EXITED;
+
+ /* Clear breakpoints, etc. associated with this thread. */
+ clear_thread_inferior_resources (tp);
+ }
+
+ /* Will be really deleted some other time. */
+ return;
+ }
+
if (tpprev)
tpprev->next = tp->next;
else
thread_list = tp->next;
+ /* Notify thread exit, but only if we haven't already. */
+ if (tp->state_ != THREAD_EXITED)
+ observer_notify_thread_exit (tp, silent);
+
free_thread (tp);
}
-static struct thread_info *
+/* Delete thread PTID and notify of thread exit. If this is
+ inferior_ptid, don't actually delete it, but tag it as exited and
+ do the notification. If PTID is the user selected thread, clear
+ it. */
+void
+delete_thread (ptid_t ptid)
+{
+ delete_thread_1 (ptid, 0 /* not silent */);
+}
+
+void
+delete_thread_silent (ptid_t ptid)
+{
+ delete_thread_1 (ptid, 1 /* silent */);
+}
+
+struct thread_info *
find_thread_id (int num)
{
struct thread_info *tp;
/* Find a thread_info by matching PTID. */
struct thread_info *
-find_thread_pid (ptid_t ptid)
+find_thread_ptid (ptid_t ptid)
{
struct thread_info *tp;
iterate_over_threads (int (*callback) (struct thread_info *, void *),
void *data)
{
+ struct thread_info *tp, *next;
+
+ for (tp = thread_list; tp; tp = next)
+ {
+ next = tp->next;
+ if ((*callback) (tp, data))
+ return tp;
+ }
+
+ return NULL;
+}
+
+int
+thread_count (void)
+{
+ int result = 0;
struct thread_info *tp;
for (tp = thread_list; tp; tp = tp->next)
- if ((*callback) (tp, data))
- return tp;
+ ++result;
- return NULL;
+ return result;
}
int
return 0; /* Never heard of 'im */
}
+/* Finds the first thread of the inferior given by PID. If PID is -1,
+ return the first thread in the list. */
+
+struct thread_info *
+first_thread_of_process (int pid)
+{
+ struct thread_info *tp, *ret = NULL;
+
+ for (tp = thread_list; tp; tp = tp->next)
+ if (pid == -1 || ptid_get_pid (tp->ptid) == pid)
+ if (ret == NULL || tp->num < ret->num)
+ ret = tp;
+
+ return ret;
+}
+
+struct thread_info *
+any_thread_of_process (int pid)
+{
+ struct thread_info *tp;
+
+ for (tp = thread_list; tp; tp = tp->next)
+ if (ptid_get_pid (tp->ptid) == pid)
+ return tp;
+
+ return NULL;
+}
+
+struct thread_info *
+any_live_thread_of_process (int pid)
+{
+ struct thread_info *tp;
+ struct thread_info *tp_running = NULL;
+
+ for (tp = thread_list; tp; tp = tp->next)
+ if (ptid_get_pid (tp->ptid) == pid)
+ {
+ if (tp->state_ == THREAD_STOPPED)
+ return tp;
+ else if (tp->state_ == THREAD_RUNNING)
+ tp_running = tp;
+ }
+
+ return tp_running;
+}
+
/* Print a list of thread ids currently known, and the total number of
threads. To be used from within catch_errors. */
static int
struct thread_info *tp;
int num = 0;
struct cleanup *cleanup_chain;
+ int current_thread = -1;
prune_threads ();
target_find_new_threads ();
for (tp = thread_list; tp; tp = tp->next)
{
+ if (tp->state_ == THREAD_EXITED)
+ continue;
+
+ if (ptid_equal (tp->ptid, inferior_ptid))
+ current_thread = tp->num;
+
num++;
ui_out_field_int (uiout, "thread-id", tp->num);
}
do_cleanups (cleanup_chain);
+
+ if (current_thread != -1)
+ ui_out_field_int (uiout, "current-thread-id", current_thread);
ui_out_field_int (uiout, "number-of-threads", num);
return GDB_RC_OK;
}
return GDB_RC_OK;
}
-/* Load infrun state for the thread PID. */
+/* Return true if TP is an active thread. */
+static int
+thread_alive (struct thread_info *tp)
+{
+ if (tp->state_ == THREAD_EXITED)
+ return 0;
+ if (!target_thread_alive (tp->ptid))
+ return 0;
+ return 1;
+}
+
+static void
+prune_threads (void)
+{
+ struct thread_info *tp, *next;
+
+ for (tp = thread_list; tp; tp = next)
+ {
+ next = tp->next;
+ if (!thread_alive (tp))
+ delete_thread (tp->ptid);
+ }
+}
void
-load_infrun_state (ptid_t ptid,
- CORE_ADDR *prev_pc,
- int *trap_expected,
- struct breakpoint **step_resume_breakpoint,
- CORE_ADDR *step_range_start,
- CORE_ADDR *step_range_end,
- struct frame_id *step_frame_id,
- int *handling_longjmp,
- int *another_trap,
- int *stepping_through_solib_after_catch,
- bpstat *stepping_through_solib_catchpoints,
- int *current_line,
- struct symtab **current_symtab)
+thread_change_ptid (ptid_t old_ptid, ptid_t new_ptid)
{
+ struct inferior *inf;
struct thread_info *tp;
- /* If we can't find the thread, then we're debugging a single threaded
- process. No need to do anything in that case. */
- tp = find_thread_id (pid_to_thread_id (ptid));
- if (tp == NULL)
- return;
+ /* It can happen that what we knew as the target inferior id
+ changes. E.g, target remote may only discover the remote process
+ pid after adding the inferior to GDB's list. */
+ inf = find_inferior_pid (ptid_get_pid (old_ptid));
+ inf->pid = ptid_get_pid (new_ptid);
- *prev_pc = tp->prev_pc;
- *trap_expected = tp->trap_expected;
- *step_resume_breakpoint = tp->step_resume_breakpoint;
- *step_range_start = tp->step_range_start;
- *step_range_end = tp->step_range_end;
- *step_frame_id = tp->step_frame_id;
- *handling_longjmp = tp->handling_longjmp;
- *another_trap = tp->another_trap;
- *stepping_through_solib_after_catch =
- tp->stepping_through_solib_after_catch;
- *stepping_through_solib_catchpoints =
- tp->stepping_through_solib_catchpoints;
- *current_line = tp->current_line;
- *current_symtab = tp->current_symtab;
-}
+ tp = find_thread_ptid (old_ptid);
+ tp->ptid = new_ptid;
-/* Save infrun state for the thread PID. */
+ observer_notify_thread_ptid_changed (old_ptid, new_ptid);
+}
void
-save_infrun_state (ptid_t ptid,
- CORE_ADDR prev_pc,
- int trap_expected,
- struct breakpoint *step_resume_breakpoint,
- CORE_ADDR step_range_start,
- CORE_ADDR step_range_end,
- const struct frame_id *step_frame_id,
- int handling_longjmp,
- int another_trap,
- int stepping_through_solib_after_catch,
- bpstat stepping_through_solib_catchpoints,
- int current_line,
- struct symtab *current_symtab)
+set_running (ptid_t ptid, int running)
{
struct thread_info *tp;
+ int all = ptid_equal (ptid, minus_one_ptid);
- /* If we can't find the thread, then we're debugging a single-threaded
- process. Nothing to do in that case. */
- tp = find_thread_id (pid_to_thread_id (ptid));
- if (tp == NULL)
- return;
-
- tp->prev_pc = prev_pc;
- tp->trap_expected = trap_expected;
- tp->step_resume_breakpoint = step_resume_breakpoint;
- tp->step_range_start = step_range_start;
- tp->step_range_end = step_range_end;
- tp->step_frame_id = (*step_frame_id);
- tp->handling_longjmp = handling_longjmp;
- tp->another_trap = another_trap;
- tp->stepping_through_solib_after_catch = stepping_through_solib_after_catch;
- tp->stepping_through_solib_catchpoints = stepping_through_solib_catchpoints;
- tp->current_line = current_line;
- tp->current_symtab = current_symtab;
+ /* We try not to notify the observer if no thread has actually changed
+ the running state -- merely to reduce the number of messages to
+ frontend. Frontend is supposed to handle multiple *running just fine. */
+ if (all || ptid_is_pid (ptid))
+ {
+ int any_started = 0;
+ for (tp = thread_list; tp; tp = tp->next)
+ if (all || ptid_get_pid (tp->ptid) == ptid_get_pid (ptid))
+ {
+ if (tp->state_ == THREAD_EXITED)
+ continue;
+ if (running && tp->state_ == THREAD_STOPPED)
+ any_started = 1;
+ tp->state_ = running ? THREAD_RUNNING : THREAD_STOPPED;
+ }
+ if (any_started)
+ observer_notify_target_resumed (ptid);
+ }
+ else
+ {
+ int started = 0;
+ tp = find_thread_ptid (ptid);
+ gdb_assert (tp);
+ gdb_assert (tp->state_ != THREAD_EXITED);
+ if (running && tp->state_ == THREAD_STOPPED)
+ started = 1;
+ tp->state_ = running ? THREAD_RUNNING : THREAD_STOPPED;
+ if (started)
+ observer_notify_target_resumed (ptid);
+ }
}
-/* Return true if TP is an active thread. */
static int
-thread_alive (struct thread_info *tp)
+is_thread_state (ptid_t ptid, enum thread_state state)
{
- if (PIDGET (tp->ptid) == -1)
- return 0;
- if (!target_thread_alive (tp->ptid))
+ struct thread_info *tp;
+
+ tp = find_thread_ptid (ptid);
+ gdb_assert (tp);
+ return tp->state_ == state;
+}
+
+int
+is_stopped (ptid_t ptid)
+{
+ return is_thread_state (ptid, THREAD_STOPPED);
+}
+
+int
+is_exited (ptid_t ptid)
+{
+ return is_thread_state (ptid, THREAD_EXITED);
+}
+
+int
+is_running (ptid_t ptid)
+{
+ return is_thread_state (ptid, THREAD_RUNNING);
+}
+
+int
+any_running (void)
+{
+ struct thread_info *tp;
+
+ for (tp = thread_list; tp; tp = tp->next)
+ if (tp->state_ == THREAD_RUNNING)
+ return 1;
+
+ return 0;
+}
+
+int
+is_executing (ptid_t ptid)
+{
+ struct thread_info *tp;
+
+ tp = find_thread_ptid (ptid);
+ gdb_assert (tp);
+ return tp->executing_;
+}
+
+void
+set_executing (ptid_t ptid, int executing)
+{
+ struct thread_info *tp;
+ int all = ptid_equal (ptid, minus_one_ptid);
+
+ if (all || ptid_is_pid (ptid))
{
- tp->ptid = pid_to_ptid (-1); /* Mark it as dead */
- return 0;
+ for (tp = thread_list; tp; tp = tp->next)
+ if (all || ptid_get_pid (tp->ptid) == ptid_get_pid (ptid))
+ tp->executing_ = executing;
+ }
+ else
+ {
+ tp = find_thread_ptid (ptid);
+ gdb_assert (tp);
+ tp->executing_ = executing;
}
- return 1;
}
-static void
-prune_threads (void)
+void
+set_stop_requested (ptid_t ptid, int stop)
{
- struct thread_info *tp, *next;
+ struct thread_info *tp;
+ int all = ptid_equal (ptid, minus_one_ptid);
- for (tp = thread_list; tp; tp = next)
+ if (all || ptid_is_pid (ptid))
{
- next = tp->next;
- if (!thread_alive (tp))
- delete_thread (tp->ptid);
+ for (tp = thread_list; tp; tp = tp->next)
+ if (all || ptid_get_pid (tp->ptid) == ptid_get_pid (ptid))
+ tp->stop_requested = stop;
}
+ else
+ {
+ tp = find_thread_ptid (ptid);
+ gdb_assert (tp);
+ tp->stop_requested = stop;
+ }
+
+ /* Call the stop requested observer so other components of GDB can
+ react to this request. */
+ if (stop)
+ observer_notify_thread_stop_requested (ptid);
}
-/* Print information about currently known threads
+void
+finish_thread_state (ptid_t ptid)
+{
+ struct thread_info *tp;
+ int all;
+ int any_started = 0;
- * Note: this has the drawback that it _really_ switches
- * threads, which frees the frame cache. A no-side
- * effects info-threads command would be nicer.
- */
+ all = ptid_equal (ptid, minus_one_ptid);
-static void
-info_threads_command (char *arg, int from_tty)
+ if (all || ptid_is_pid (ptid))
+ {
+ for (tp = thread_list; tp; tp = tp->next)
+ {
+ if (tp->state_ == THREAD_EXITED)
+ continue;
+ if (all || ptid_get_pid (ptid) == ptid_get_pid (tp->ptid))
+ {
+ if (tp->executing_ && tp->state_ == THREAD_STOPPED)
+ any_started = 1;
+ tp->state_ = tp->executing_ ? THREAD_RUNNING : THREAD_STOPPED;
+ }
+ }
+ }
+ else
+ {
+ tp = find_thread_ptid (ptid);
+ gdb_assert (tp);
+ if (tp->state_ != THREAD_EXITED)
+ {
+ if (tp->executing_ && tp->state_ == THREAD_STOPPED)
+ any_started = 1;
+ tp->state_ = tp->executing_ ? THREAD_RUNNING : THREAD_STOPPED;
+ }
+ }
+
+ if (any_started)
+ observer_notify_target_resumed (ptid);
+}
+
+void
+finish_thread_state_cleanup (void *arg)
+{
+ ptid_t *ptid_p = arg;
+
+ gdb_assert (arg);
+
+ finish_thread_state (*ptid_p);
+}
+
+/* Prints the list of threads and their details on UIOUT.
+ This is a version of 'info_thread_command' suitable for
+ use from MI.
+ If REQUESTED_THREAD is not -1, it's the GDB id of the thread
+ that should be printed. Otherwise, all threads are
+ printed.
+ If PID is not -1, only print threads from the process PID.
+ Otherwise, threads from all attached PIDs are printed.
+ If both REQUESTED_THREAD and PID are not -1, then the thread
+ is printed if it belongs to the specified process. Otherwise,
+ an error is raised. */
+void
+print_thread_info (struct ui_out *uiout, int requested_thread, int pid)
{
struct thread_info *tp;
ptid_t current_ptid;
- struct frame_info *cur_frame;
struct cleanup *old_chain;
- struct frame_id saved_frame_id;
char *extra_info;
-
- /* Backup current thread and selected frame. */
- saved_frame_id = get_frame_id (get_selected_frame (NULL));
- old_chain = make_cleanup_restore_current_thread (inferior_ptid, saved_frame_id);
+ int current_thread = -1;
prune_threads ();
target_find_new_threads ();
current_ptid = inferior_ptid;
+
+ /* We'll be switching threads temporarily. */
+ old_chain = make_cleanup_restore_current_thread ();
+
+ make_cleanup_ui_out_list_begin_end (uiout, "threads");
for (tp = thread_list; tp; tp = tp->next)
{
+ struct cleanup *chain2;
+
+ if (requested_thread != -1 && tp->num != requested_thread)
+ continue;
+
+ if (pid != -1 && PIDGET (tp->ptid) != pid)
+ {
+ if (requested_thread != -1)
+ error (_("Requested thread not found in requested process"));
+ continue;
+ }
+
if (ptid_equal (tp->ptid, current_ptid))
- printf_filtered ("* ");
+ current_thread = tp->num;
+
+ if (tp->state_ == THREAD_EXITED)
+ continue;
+
+ chain2 = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
+
+ if (ptid_equal (tp->ptid, current_ptid))
+ ui_out_text (uiout, "* ");
else
- printf_filtered (" ");
+ ui_out_text (uiout, " ");
- printf_filtered ("%d %s", tp->num, target_tid_to_str (tp->ptid));
+ ui_out_field_int (uiout, "id", tp->num);
+ ui_out_text (uiout, " ");
+ ui_out_field_string (uiout, "target-id", target_pid_to_str (tp->ptid));
extra_info = target_extra_thread_info (tp);
if (extra_info)
- printf_filtered (" (%s)", extra_info);
- puts_filtered (" ");
- /* That switch put us at the top of the stack (leaf frame). */
- switch_to_thread (tp->ptid);
- print_stack_frame (get_selected_frame (NULL), 0, LOCATION);
+ {
+ ui_out_text (uiout, " (");
+ ui_out_field_string (uiout, "details", extra_info);
+ ui_out_text (uiout, ")");
+ }
+ ui_out_text (uiout, " ");
+
+ if (tp->state_ == THREAD_RUNNING)
+ ui_out_text (uiout, "(running)\n");
+ else
+ {
+ /* The switch below puts us at the top of the stack (leaf
+ frame). */
+ switch_to_thread (tp->ptid);
+ print_stack_frame (get_selected_frame (NULL),
+ /* For MI output, print frame level. */
+ ui_out_is_mi_like_p (uiout),
+ LOCATION);
+ }
+
+ if (ui_out_is_mi_like_p (uiout))
+ {
+ char *state = "stopped";
+ if (tp->state_ == THREAD_RUNNING)
+ state = "running";
+ ui_out_field_string (uiout, "state", state);
+ }
+
+ do_cleanups (chain2);
}
/* Restores the current thread and the frame selected before
the "info threads" command. */
do_cleanups (old_chain);
- /* If case we were not able to find the original frame, print the
- new selected frame. */
- if (frame_find_by_id (saved_frame_id) == NULL)
+ if (pid == -1 && requested_thread == -1)
{
- warning (_("Couldn't restore frame in current thread, at frame 0"));
- print_stack_frame (get_selected_frame (NULL), 0, LOCATION);
+ gdb_assert (current_thread != -1
+ || !thread_list
+ || ptid_equal (inferior_ptid, null_ptid));
+ if (current_thread != -1 && ui_out_is_mi_like_p (uiout))
+ ui_out_field_int (uiout, "current-thread-id", current_thread);
+
+ if (current_thread != -1 && is_exited (current_ptid))
+ ui_out_message (uiout, 0, "\n\
+The current thread <Thread ID %d> has terminated. See `help thread'.\n",
+ current_thread);
+ else if (thread_list
+ && current_thread == -1
+ && ptid_equal (current_ptid, null_ptid))
+ ui_out_message (uiout, 0, "\n\
+No selected thread. See `help thread'.\n");
}
}
-/* Switch from one thread to another. */
+
+/* Print information about currently known threads
+
+ * Note: this has the drawback that it _really_ switches
+ * threads, which frees the frame cache. A no-side
+ * effects info-threads command would be nicer.
+ */
static void
+info_threads_command (char *arg, int from_tty)
+{
+ print_thread_info (uiout, -1, -1);
+}
+
+/* Switch from one thread to another. */
+
+void
switch_to_thread (ptid_t ptid)
{
+ /* Switch the program space as well, if we can infer it from the now
+ current thread. Otherwise, it's up to the caller to select the
+ space it wants. */
+ if (!ptid_equal (ptid, null_ptid))
+ {
+ struct inferior *inf;
+
+ inf = find_inferior_pid (ptid_get_pid (ptid));
+ gdb_assert (inf != NULL);
+ set_current_program_space (inf->pspace);
+ set_current_inferior (inf);
+ }
+
if (ptid_equal (ptid, inferior_ptid))
return;
inferior_ptid = ptid;
reinit_frame_cache ();
registers_changed ();
- stop_pc = read_pc ();
+
+ /* We don't check for is_stopped, because we're called at times
+ while in the TARGET_RUNNING state, e.g., while handling an
+ internal event. */
+ if (!ptid_equal (inferior_ptid, null_ptid)
+ && !is_exited (ptid)
+ && !is_executing (ptid))
+ stop_pc = regcache_read_pc (get_thread_regcache (ptid));
+ else
+ stop_pc = ~(CORE_ADDR) 0;
}
static void
restore_current_thread (ptid_t ptid)
{
- if (!ptid_equal (ptid, inferior_ptid))
- {
- switch_to_thread (ptid);
- }
+ switch_to_thread (ptid);
}
static void
-restore_selected_frame (struct frame_id a_frame_id)
+restore_selected_frame (struct frame_id a_frame_id, int frame_level)
{
- struct frame_info *selected_frame_info = NULL;
+ struct frame_info *frame = NULL;
+ int count;
+
+ gdb_assert (frame_level >= 0);
+
+ /* Restore by level first, check if the frame id is the same as
+ expected. If that fails, try restoring by frame id. If that
+ fails, nothing to do, just warn the user. */
+
+ count = frame_level;
+ frame = find_relative_frame (get_current_frame (), &count);
+ if (count == 0
+ && frame != NULL
+ /* The frame ids must match - either both valid or both outer_frame_id.
+ The latter case is not failsafe, but since it's highly unlikely
+ the search by level finds the wrong frame, it's 99.9(9)% of
+ the time (for all practical purposes) safe. */
+ && frame_id_eq (get_frame_id (frame), a_frame_id))
+ {
+ /* Cool, all is fine. */
+ select_frame (frame);
+ return;
+ }
+
+ frame = frame_find_by_id (a_frame_id);
+ if (frame != NULL)
+ {
+ /* Cool, refound it. */
+ select_frame (frame);
+ return;
+ }
- if (frame_id_eq (a_frame_id, null_frame_id))
- return;
+ /* Nothing else to do, the frame layout really changed. Select the
+ innermost stack frame. */
+ select_frame (get_current_frame ());
- if ((selected_frame_info = frame_find_by_id (a_frame_id)) != NULL)
+ /* Warn the user. */
+ if (frame_level > 0 && !ui_out_is_mi_like_p (uiout))
{
- select_frame (selected_frame_info);
+ warning (_("\
+Couldn't restore frame #%d in current thread, at reparsed frame #0\n"),
+ frame_level);
+ /* For MI, we should probably have a notification about
+ current frame change. But this error is not very
+ likely, so don't bother for now. */
+ print_stack_frame (get_selected_frame (NULL), 1, SRC_LINE);
}
}
{
ptid_t inferior_ptid;
struct frame_id selected_frame_id;
+ int selected_frame_level;
+ int was_stopped;
+ int inf_id;
};
static void
do_restore_current_thread_cleanup (void *arg)
+{
+ struct thread_info *tp;
+ struct current_thread_cleanup *old = arg;
+
+ tp = find_thread_ptid (old->inferior_ptid);
+
+ /* If the previously selected thread belonged to a process that has
+ in the mean time been deleted (due to normal exit, detach, etc.),
+ then don't revert back to it, but instead simply drop back to no
+ thread selected. */
+ if (tp
+ && find_inferior_pid (ptid_get_pid (tp->ptid)) != NULL)
+ restore_current_thread (old->inferior_ptid);
+ else
+ {
+ restore_current_thread (null_ptid);
+ set_current_inferior (find_inferior_id (old->inf_id));
+ }
+
+ /* The running state of the originally selected thread may have
+ changed, so we have to recheck it here. */
+ if (!ptid_equal (inferior_ptid, null_ptid)
+ && old->was_stopped
+ && is_stopped (inferior_ptid)
+ && target_has_registers
+ && target_has_stack
+ && target_has_memory)
+ restore_selected_frame (old->selected_frame_id,
+ old->selected_frame_level);
+}
+
+static void
+restore_current_thread_cleanup_dtor (void *arg)
{
struct current_thread_cleanup *old = arg;
- restore_current_thread (old->inferior_ptid);
- restore_selected_frame (old->selected_frame_id);
+ struct thread_info *tp;
+ tp = find_thread_ptid (old->inferior_ptid);
+ if (tp)
+ tp->refcount--;
xfree (old);
}
-static struct cleanup *
-make_cleanup_restore_current_thread (ptid_t inferior_ptid,
- struct frame_id a_frame_id)
+struct cleanup *
+make_cleanup_restore_current_thread (void)
{
- struct current_thread_cleanup *old
- = xmalloc (sizeof (struct current_thread_cleanup));
+ struct thread_info *tp;
+ struct frame_info *frame;
+ struct current_thread_cleanup *old;
+
+ old = xmalloc (sizeof (struct current_thread_cleanup));
old->inferior_ptid = inferior_ptid;
- old->selected_frame_id = a_frame_id;
- return make_cleanup (do_restore_current_thread_cleanup, old);
+ old->inf_id = current_inferior ()->num;
+
+ if (!ptid_equal (inferior_ptid, null_ptid))
+ {
+ old->was_stopped = is_stopped (inferior_ptid);
+ if (old->was_stopped
+ && target_has_registers
+ && target_has_stack
+ && target_has_memory)
+ frame = get_selected_frame (NULL);
+ else
+ frame = NULL;
+
+ old->selected_frame_id = get_frame_id (frame);
+ old->selected_frame_level = frame_relative_level (frame);
+
+ tp = find_thread_ptid (inferior_ptid);
+ if (tp)
+ tp->refcount++;
+ }
+
+ return make_cleanup_dtor (do_restore_current_thread_cleanup, old,
+ restore_current_thread_cleanup_dtor);
}
/* Apply a GDB command to a list of threads. List syntax is a whitespace
{
struct thread_info *tp;
struct cleanup *old_chain;
- struct cleanup *saved_cmd_cleanup_chain;
char *saved_cmd;
- struct frame_id saved_frame_id;
- ptid_t current_ptid;
- int thread_has_changed = 0;
if (cmd == NULL || *cmd == '\000')
error (_("Please specify a command following the thread ID list"));
-
- current_ptid = inferior_ptid;
- saved_frame_id = get_frame_id (get_selected_frame (NULL));
- old_chain = make_cleanup_restore_current_thread (inferior_ptid, saved_frame_id);
- /* It is safe to update the thread list now, before
- traversing it for "thread apply all". MVS */
+ prune_threads ();
target_find_new_threads ();
+ old_chain = make_cleanup_restore_current_thread ();
+
/* Save a copy of the command in case it is clobbered by
execute_command */
saved_cmd = xstrdup (cmd);
- saved_cmd_cleanup_chain = make_cleanup (xfree, (void *) saved_cmd);
+ make_cleanup (xfree, saved_cmd);
for (tp = thread_list; tp; tp = tp->next)
if (thread_alive (tp))
{
switch_to_thread (tp->ptid);
+
printf_filtered (_("\nThread %d (%s):\n"),
- tp->num, target_tid_to_str (inferior_ptid));
+ tp->num, target_pid_to_str (inferior_ptid));
execute_command (cmd, from_tty);
strcpy (cmd, saved_cmd); /* Restore exact command used previously */
}
- if (!ptid_equal (current_ptid, inferior_ptid))
- thread_has_changed = 1;
-
- do_cleanups (saved_cmd_cleanup_chain);
do_cleanups (old_chain);
- /* Print stack frame only if we changed thread. */
- if (thread_has_changed)
- print_stack_frame (get_current_frame (), 1, SRC_LINE);
-
}
static void
char *cmd;
char *p;
struct cleanup *old_chain;
- struct cleanup *saved_cmd_cleanup_chain;
char *saved_cmd;
- struct frame_id saved_frame_id;
- ptid_t current_ptid;
- int thread_has_changed = 0;
if (tidlist == NULL || *tidlist == '\000')
error (_("Please specify a thread ID list"));
if (*cmd == '\000')
error (_("Please specify a command following the thread ID list"));
- current_ptid = inferior_ptid;
- saved_frame_id = get_frame_id (get_selected_frame (NULL));
- old_chain = make_cleanup_restore_current_thread (inferior_ptid, saved_frame_id);
-
/* Save a copy of the command in case it is clobbered by
execute_command */
saved_cmd = xstrdup (cmd);
- saved_cmd_cleanup_chain = make_cleanup (xfree, (void *) saved_cmd);
+ old_chain = make_cleanup (xfree, saved_cmd);
while (tidlist < cmd)
{
struct thread_info *tp;
else
end = start;
+ make_cleanup_restore_current_thread ();
+
for (; start <= end; start++)
{
tp = find_thread_id (start);
else
{
switch_to_thread (tp->ptid);
+
printf_filtered (_("\nThread %d (%s):\n"), tp->num,
- target_tid_to_str (inferior_ptid));
+ target_pid_to_str (inferior_ptid));
execute_command (cmd, from_tty);
- strcpy (cmd, saved_cmd); /* Restore exact command used previously */
+
+ /* Restore exact command used previously. */
+ strcpy (cmd, saved_cmd);
}
}
}
- if (!ptid_equal (current_ptid, inferior_ptid))
- thread_has_changed = 1;
-
- do_cleanups (saved_cmd_cleanup_chain);
do_cleanups (old_chain);
- /* Print stack frame only if we changed thread. */
- if (thread_has_changed)
- print_stack_frame (get_current_frame (), 1, SRC_LINE);
}
/* Switch to the specified thread. Will dispatch off to thread_apply_command
{
if (!tidstr)
{
- /* Don't generate an error, just say which thread is current. */
+ if (ptid_equal (inferior_ptid, null_ptid))
+ error (_("No thread selected"));
+
if (target_has_stack)
- printf_filtered (_("[Current thread is %d (%s)]\n"),
- pid_to_thread_id (inferior_ptid),
- target_tid_to_str (inferior_ptid));
+ {
+ if (is_exited (inferior_ptid))
+ printf_filtered (_("[Current thread is %d (%s) (exited)]\n"),
+ pid_to_thread_id (inferior_ptid),
+ target_pid_to_str (inferior_ptid));
+ else
+ printf_filtered (_("[Current thread is %d (%s)]\n"),
+ pid_to_thread_id (inferior_ptid),
+ target_pid_to_str (inferior_ptid));
+ }
else
error (_("No stack."));
return;
gdb_thread_select (uiout, tidstr, NULL);
}
+/* Print notices when new threads are attached and detached. */
+int print_thread_events = 1;
+static void
+show_print_thread_events (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
+{
+ fprintf_filtered (file, _("\
+Printing of thread events is %s.\n"),
+ value);
+}
+
static int
do_captured_thread_select (struct ui_out *uiout, void *tidstr)
{
switch_to_thread (tp->ptid);
+ annotate_thread_changed ();
+
ui_out_text (uiout, "[Switching to thread ");
ui_out_field_int (uiout, "new-thread-id", pid_to_thread_id (inferior_ptid));
ui_out_text (uiout, " (");
- ui_out_text (uiout, target_tid_to_str (inferior_ptid));
+ ui_out_text (uiout, target_pid_to_str (inferior_ptid));
ui_out_text (uiout, ")]");
- print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
+ /* Note that we can't reach this with an exited thread, due to the
+ thread_alive check above. */
+ if (tp->state_ == THREAD_RUNNING)
+ ui_out_text (uiout, "(running)\n");
+ else
+ print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
+
+ /* Since the current thread may have changed, see if there is any
+ exited thread we can now delete. */
+ prune_threads ();
+
return GDB_RC_OK;
}
if (!xdb_commands)
add_com_alias ("t", "thread", class_run, 1);
+
+ add_setshow_boolean_cmd ("thread-events", no_class,
+ &print_thread_events, _("\
+Set printing of thread events (such as thread start and exit)."), _("\
+Show printing of thread events (such as thread start and exit)."), NULL,
+ NULL,
+ show_print_thread_events,
+ &setprintlist, &showprintlist);
}
projects / binutils.git / blobdiff